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Erschienen in: European Surgery 6/2020

Open Access 24.08.2020 | review

Closed-incision negative-pressure wound management in surgery—literature review and recommendations

verfasst von: Maria A. Smolle, Sebastian P. Nischwitz, Martin Hutan, Primoz Trunk, David Lumenta, Gerwin A. Bernhardt

Erschienen in: European Surgery | Ausgabe 6/2020

Summary

Background

Wound healing deficits and subsequent surgical site infections are potential complications after surgical procedures, resulting in increased morbidity and treatment costs. Closed-incision negative-pressure wound therapy (ciNPWT) systems seem to reduce postoperative wound complications by sealing the wound and reducing tensile forces.

Materials and methods

We conducted a collaborative English literature review in the PubMed database including publications from 2009 to 2020 on ciNPWT use in five surgical subspecialities (orthopaedics and trauma, general surgery, plastic surgery, cardiac surgery and vascular surgery). With literature reviews, case reports and expert opinions excluded, the remaining 59 studies were critically summarized and evaluated with regard to their level of evidence.

Results

Of nine studies analysed in orthopaedics and trauma, positive results of ciNPWT were reported in 55.6%. In 11 of 13 (84.6%), 13 of 15 (86.7%) and 10 of 10 (100%) of studies analysed in plastic, vascular and general surgery, respectively, a positive effect of ciNPWT was observed. On the contrary, only 4 of 12 studies from cardiac surgery discovered positive effects of ciNPWT (33.3%).

Conclusion

ciNPWT is a promising treatment modality to improve postoperative wound healing, notably when facing increased tensile forces. To optimise ciNPWT benefits, indications for its use should be based on patient- and procedure-related risk factors.
Hinweise

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Introduction

Wound complications following surgery may include dehiscence, prolonged secretion and infection. Surgical site infections (SSI) account for approximately 20% of all hospital-acquired infections and result in a prolonged length of stay, increased readmission rate and higher treatment costs [1]. In 2 to 5% of patients undergoing inpatient elective surgery, SSI develop after an average length of stay of 9.7 days [1, 2]. Overall, costs of SSI treatment are estimated to amount to 3.5 to 10 billion dollars in the United States per year [2]. About 60% of SSI are said to be preventable [2]. Several risk factors associated with SSI have been identified and can be divided into intrinsic (i.e. patient-related) and extrinsic (i.e. procedure-related) factors. Intrinsic risk factors can be subdivided into modifiable (e.g. obesity, alcoholism and smoking, but also diabetes, immunosuppression) and non-modifiable (patient age, skin quality and/or microbial environment) [1]. Likewise, extrinsic factors can be based on the type of surgical procedure, surgical protocols used for perioperative management and other factors related to the healthcare facility (e.g. surgical caseload per operating theatre, condition of sterile equipment and anaesthetic/surgical infrastructure) [2].
Postoperative wound management can be optimized by surgical suture material and wound dressings, as well as by timing and frequency of dressing changes [1]. Closed-incision negative-pressure wound therapy (ciNPWT) systems represent a relatively new modulator in this sector.

Closed-incision negative-pressure wound therapy

Postoperative wound management consists of dressing changes based on the postoperative protocol as outlined by the surgeon or facility, and usually involves repetitive intervals for removal of dressings, disinfection and the re-application of a wound dressing [3]. However, every dressing change disrupts the wound’s microenvironment and potentially increases the risk of SSI. Thus, dressing materials have been developed to remain in place for several days to improve barrier function and support the wound healing process [3, 4].
Closed-incision negative-pressure wound therapy (ciNPWT) has gained importance during the past 20 years [3, 5]. In practice, ciNPWT is applied to a closed/sutured, previously cleaned incision under sterile conditions. A foam is placed on the wound, with or without interposed non-adherent dressings, followed by an occlusive drape [3]. Subsequently, negative pressure is applied to the closed system via a suction mechanism (Fig. 1). Immediate effects of ciNPWT include maintenance of the wound’s microenvironment, protection from external contamination, reduction of tensile forces at the wound edges, enhancement of appositional strength, normalization of stress distribution and improvement of skin perfusion [3]. Decreased formation of haematoma and seroma were linked to improved vascular and lymphatic flow, and may be an additional mid-term benefit of ciNPWT [3]. In the long term, application of ciNPWT was associated with improved mechanical strength of the scar due to a downregulation of genes associated with hypoxia, scarring, impaired wound healing, inflammation and delayed re-epithelialization in early wound healing stages [3, 6]. The increased use of ciNPWT after surgery is reflected by the rising number of publications and manufacturers selling ciNPWT devices.
The aim of this review was to provide an overview of the medical literature on ciNPWT in different surgical subspecialties and derive best-practice recommendations highlighting their level of evidence.

Methods

MEDLINE and PubMed were searched for studies analysing ciNPWT use in predefined surgical fields, i.e. trauma and orthopaedics, general surgery, plastic surgery, vascular surgery and cardiac surgery, published from 2009 to 2020. Retrospective case series, case–control studies, prospective non-randomised comparative studies, prospective randomised controlled trials (RCTs), systematic reviews and meta-analyses published in English language were eligible. Case reports, expert opinions, articles in languages other than English, non-systematic reviews, animal studies and study protocols were excluded. All studies included were subsequently classified into levels of evidence (ranging from I to V) according to the Oxford Centre for Evidence-Based Medicine (OCEBM) [7]. Studies were summarised according to the main surgical field where ciNPWT usage had been analysed into the subsections “trauma and orthopaedics”, “plastic surgery”, “cardiac surgery”, “vascular surgery” and “general surgery”. The latter subsection also contained meta-analyses grouping together studies from different surgical specialities.

Results

Trauma and orthopaedics

Total hip (THA) and knee arthroplasties (TKA) are increasingly performed for osteoarthritis of hip and knee [8]. Although wound complications are considered a rare event, they may have dramatic consequences, potentially leading to development of early periprosthetic joint infections [9]. Operative interventions for hand trauma were frequently associated with postoperative wound healing deficits. Proximal tibial and distal tibial (pilon) fractures can be accompanied by SSI in up to 27.0 and 40% of cases, respectively [1012]. Consequently, prevention of wound healing problems in both elective and emergency settings is of increasing importance. Overall, we identified three retrospective studies, five RCTs and one systematic review published on the use of ciNPWT in orthopaedic or trauma cases (Table 1).
Table 1
Studies published on use of closed-incision negative-pressure wound therapy (ciNPWT) following orthopaedic and trauma surgery
Level of evidence
Study
Procedure
Design
Patients
Intervention
Rate of SSI
Comments
IV
Cooper, HJ 2018 Injury [13]
Periprosthetic hip fracture, periprosthetic knee fracture
Retrospective case–control study
Intervention group: 27
Control group: 40
ciNPWT (n = 27) with Prevena®
Intervention group: 0.0%
Control group: 25.0%
Lower overall wound complication rate (4.0% vs. 35.0%) and revision rate (4.0% vs. 25.0%) for ciNPWT group in comparison to controls
II
Redfern, RE 2017 J Arthroplasty [17]
Primary total knee arthroplasty, primary total hip arthroplasty
RCT
Intervention group: 169 Control group: 192
ciNPWT (n = 169) with Prevena (KCI) for 6–8 days
Deep SSI
Intervention group: 1.0%
Control group: 1.25%
Overall wound complication rate significantly lower in ciNPWT group in comparison to controls (1.5% vs. 5.5%)
IV
Stenqvist, CP 2019 Int Wound J [14]
Non-traumatic lower limb amputation
Retrospective case-control study
Intervention group: 139
Control group: 170
ciNPWT (n = 139)
N/A
No significant difference in patient survival (36.0% vs. 39.0% at 3 years) or rate of revision surgery (12.2% vs. 15.9%) between ciNPWT and controls
IV
Zayan, NE 2019 Adv Wound Care [15]
Major limb amputation, amputation revision site closure
Retrospective case series
25
ciNPWT (n = 25)
4.0%
II
Costa, ML 2020 JAMA [20]
Major-trauma lower limb fractures
RCT
Intervention group: 785
Control group: 763
ciNPWT (n = 785)
Deep SSI
Intervention group: 5.8%
Control group: 6.7%
No significant difference in deep SSI at 30 or 90 days, patient-reported outcome scores, presence of chronic neuropathic pain and self-assessment of surgical scar
II
Newman, JM 2019 J Arthroplasty [16]
Revision total knee arthroplasty, revision total hip arthroplasty
Prospective randomised controlled trial
Intervention group: 80
Control group: 80
ciNPWT (n = 80) with Prevena®
Overall wound complication rate
Intervention group: 10.1%
Control group: 23.8%
II
Keeney, JA 2019 J Arthroplasty [18]
Primary or revision total knee arthroplasty, primary or revision total hip arthroplasty
RCT
Intervention group: 185
Control group: 213
ciNPWT (n = 185) with PICO
Late SSI
Intervention group: 4.0%
Control group: 3.4%
Fewer complications for TKA patients with BMI >35 kg/m2 treated with ciNPWT (1.3% vs. 21.6%; p < 0.01)
I
Kim, JH 2019 J Arthroplasty [9]
Total knee arthroplasty, total hip arthroplasty
Systematic review and meta-analysis of 8 RCTs and 4 retrospective studies
Intervention group: 790
Control group: 1274
ciNPWT (n = 790)
Intervention group: 2.3%
Control group: 6.9%
Overall wound complication rate significantly lower in ciNPWT-treated patients (9.3% vs. 12.8%)
II
Alga, A 2020 Lancet Glob Health [19]
Conflict-related extremity wounds
RCT
Intervention group: 88
Control group: 86
ciNPWT (n = 88)
Intervention group: 12.0%
Control group: 23.0%
ciNPWT closed-incision negative-pressure wound therapy, SSI surgical site infection, N/A not applicable, TKA total knee arthroplasty, BMI body mass index, RCT randomised controlled trial
Cooper et al. [13] performed a retrospective case–control study including 59 patients with periprosthetic fractures of the hip (n = 44) and knee (n = 15), as well as 8 patients with interprosthetic fractures. Of these, 27 were treated with an ciNPWT system following surgery. The remaining 40 patients underwent conventional wound care. During the postoperative course, the rate of deep SSI was significantly lower in patients treated with ciNPWT in comparison to controls (0.0% vs. 25.0%; p = 0.004), as were the overall wound complication rate (4.0% vs. 35.0%; p = 0.002) and the revision rate (4.0% vs. 25.0%; p = 0.021). The authors concluded that ciNPWT may be used to reduce wound healing deficits in patients following periprosthetic lower limb fractures (level IV) [13]. In another retrospective case–control study, 309 patients undergoing 403 major lower limb amputations for non-traumatic indications were analysed with a specific focus on the potential effect of ciNPWT on postoperative survival rates [14]. Most common indications for lower limb amputation were diabetes and chronic wounds. Altogether, 139 patients were treated with ciNPWT post amputation, and 170 received a conventional stump bandage. There was no significant difference in patient survival depending on the type of postoperative wound management used (ciNPWT vs. conventional stump bandage: 52.0 and 36.0% vs. 49.0 and 39.0% survival at 2 and 3 years, respectively; p = 0.970). Furthermore, there was no significant difference between the two groups with regards to rate of revision surgery (12.2% vs. 15.9%; ciNPWT vs. control; p = 0.740). The authors concluded that ciNPWT does not improve survival probability in patients undergoing major lower limb amputation for non-traumatic indications (level IV) [14]. Zayan et al. [15] published results of a retrospective case series including 4 patients with upper limb amputation and 21 patients with lower limb amputation. Seventeen operations were primary amputations, whilst eight interventions constituted revisions for failed amputation. All patients had been treated with ciNPWT following amputation. The SSI rate was 4.0%, whilst no seroma, haematoma or wound dehiscence was observed (level IV) [15].
In the RCT by Newman et al., 160 patients at a high risk of postoperative wound complications undergoing revision TKA or THA were randomly assigned to the intervention group (ciNPWT, n = 80) or control group (standard dressing; n = 80). Specifically, at least one of the following risk factors was present in any participant: human immunodeficiency virus infection (2.5%), history of organ transplant (1.3%), immunosuppression (16.3%), history of periprosthetic joint infection (35.6%), current smoker (12.5%), depression (41.9%), peripheral vascular disease (10.0%), use of anticoagulants other than aspirin (39.4%), diabetes (23.1%), body mass index >35 kg/m2 (33.1%), liver disease (5.0%), malnutrition (0.6%), inflammatory arthritis (18.1%), renal failure (7.5%) or presence of haematological/oncological disease (2.5%). In this high-risk cohort, the use of ciNPWT was associated with a significant reduction of postoperative wound complication rate in comparison to controls (10.1% vs. 23.8%; p = 0.022), as well as with regards to revision rate (2.5% vs. 12.5%; p = 0.017). However, readmission rate was comparable between patients treated with ciNPWT and controls (20.3% vs. 23.8%; p = 0.595). Based on their observations, the authors concluded that ciNPWT treatment may reduce the risk of wound healing deficits in high-risk patients undergoing revision arthroplasty (level II) [16]. Kim et al. [9] performed a systematic review and meta-analysis of patients receiving ciNPWT (n = 790) or conventional wound care (n = 1274) following primary TKA or THA. Again, the use of ciNPWT significantly reduced overall wound complication rate (9.3% vs. 12.8% for controls) as well as SSI rate (2.3% vs. 6.9% for controls). The overall wound complication rate for patients undergoing primary TKA or THA was lower than for patients undergoing revision arthroplasty [16]. Nevertheless, an equally significant protective effect of ciNPWT in patients undergoing primary arthroplasty was found (level I) [9]. Use of ciNPWT following primary THA or TKA was investigated in a single-centre RCT by Redfern et al. [17]. One hundred sixty-nine patients were treated with a ciNPWT system for 6–8 days after surgery, whilst 192 patients underwent conventional wound care. There was no significant difference in deep SSI rate between ciNPWT and control groups (1.0% vs. 1.25%; p = 0.810). However, the overall wound complication rate was significantly lower in cases where ciNPWT had been used (1.5% vs. 5.5%; p = 0.020). The authors concluded that ciNPWT may be applied following primary TKA or THA to improve wound healing (level II) [17]. A similar prospective RCT was performed by Keeney et al. in 2019 [18], analysing the effect of a ciNPWT device following primary or revision THA or TKA (n = 185) in comparison to standard wound dressings (n = 213). There was no significant difference in the rate of late deep or superficial SSI between ciNPWT-treated patients and controls (4.0% vs. 3.4%). However, obese patients (BMI >35 kg/m2) undergoing TKA were significantly less likely to develop any wound-related complications if ciNPWT had been administered (1.3% vs. 21.6%; p < 0.01). The authors concluded that ciNPWT may be effectively used following TKA, especially in those with high BMI (level II) [18]. In the RCT by Alga et al. [19], patients with conflict-related extremity wounds (n = 174) were randomly assigned to receive ciNPWT (n = 88) or conventional wound care (n = 86). At the fifth postoperative day, 49.0% (ciNPWT) and 60.0% (control) of wounds had healed (p = 0.212). There was no significant difference between the intervention and control groups regarding development of SSI (12.0% vs. 23.0%; p = 0.068). The authors concluded that ciNPWT had no significant benefit in acute conflict-related wounds (level II), and they even questioned the application of costly treatments in resource-limited conflict settings (level II) [19]. The most recent RCT was published by Costa et al. in 2020 [20], randomly assigning 1548 adult patients with major limb trauma in the Wound Healing in Surgery for Trauma (WHIST) trial to either ciNPWT (n = 785) or standard wound care (n = 763). The authors did not discover a statistically significant difference in rates of deep SSI between ciNPWT-treated patients and controls at 30 days (5.8% vs. 6.7%) and 90 days (11.4% vs. 13.2%). Furthermore, there were no significant differences between the two groups regarding secondary outcome measures such as self-assessment of surgical scar, presence of chronic neuropathic pain and patient-reported outcome scores [20]. They concluded that ciNPWT had no protective effect on the development of deep SSI in patients with lower limb fractures following major trauma (level II) [20].

General surgery

SSI developed in up to 45.0% of patients undergoing colorectal surgery [21]. Besides causing significant financial burden, SSI following colorectal surgery often led to prolonged hospital stay, negatively affected patients’ quality of life and increased the risk of developing incisional hernias [22].
Two systematic reviews and one meta-analysis were identified analysing the effect of ciNPWT following laparotomy for general surgical procedures, colorectal surgery and gynaecological procedures (Table 2). In the systematic review by Fowler et al. [23], four prospective RTCs and four retrospective studies were analysed to assess the potential effect of ciNPWT on wound healing following open abdominal surgery in comparison to standard dressing. Overall, 454 patients were treated with ciNPWT, with a standard Vacuum Assisted Closure (VAC) system in four studies and a ciNPWT system in another four studies [23]. The remaining 1016 patients received standard dressings. In eight of the nine studies investigated, a significant reduction in SSI was observed in the ciNPWT group in comparison to the control group. The only study not reporting a statistically significant difference was based on a retrospective analysis of 208 patients undergoing laparotomy for oncologic gynaecology resections, of whom 22 were treated with a VAC system [23, 24]. Across all studies, between 2.9 and 12.5% of patients in the intervention groups developed SSI, as compared to 7.2 to 44.0% of patients in the control group [23]. The authors concluded that ciNPWT was a promising measure to lower the risk of SSI in patients with abdominal surgery, although its impact on other wound complications remained unanswered (level I) [23]. In the systematic review and meta-analysis by Sahebally et al. [25], three RTCs, two prospective and three retrospective studies assessing the impact of ciNPWT on SSI following laparotomy for colorectal and general surgery were analysed. Altogether, 704 patients were treated with standard dressings, whilst 485 patients received ciNPWT following laparotomy. In four studies a standard VAC system was used, whilst in five studies a ciNPWT system was applied [25]. The rate of SSI ranged between 25.5 and 48.0% for the control group and 0.0 to 20.5% for the intervention group. On random-effects analysis, ciNPWT was associated with a significantly lower SSI rate in comparison to standard dressings (OR: 0.25; 95%CI: 0.12–0.52; p < 0.001). Other wound complications like seroma (OR: 0.38; 95%CI: 0.12–1.23; p = 0.100) or dehiscence (OR: 2.03; 95%CI: 0.61–6.78; p = 0.25) showed no significantly different occurrence between intervention and control groups. In the subgroup analysis including patients after colorectal surgery only, ciNPWT was significantly associated with a reduced risk of SSI (OR: 0.16; 95%CI: 0.07–0.36; p < 0.001). Therefore, the authors concluded that ciNPWT was associated with reduced rates of SSI following laparotomy for colorectal and general surgery, although the rate of other wound complications was not affected [25]. In the meta-analysis by Tran et al. [26], summarising results of two RCTs and nine retrospective studies with altogether 1723 patients undergoing abdominal wall reconstruction, the use of ciNPWT (n = 681) was associated with a lower SSI rate (15.0% vs. 28.0%; p < 0.001) and wound dehiscence rate (8.0% vs. 15.0%; p < 0.001) in comparison to patients treated by conventional wound care (n = 1042). However, no statistically significant differences with regard to seroma or haematoma formation, reoperation or readmission-rate were observed (level I) [26].
Table 2
Reviews and meta-analyses published analysing the effect of closed-incision negative-pressure wound therapy (ciNPWT) following general surgery, as well as for mixed indications
Level of evidence
Study
Procedure
Design
Patients
Intervention
Rate of SSI
Comments
I
Sahebally, SM 2018 JAMA Surgery [25]
Laparotomy for colorectal and general surgery
Systematic review and meta-analysis of 3 RTCs, 2 prospective, 3 retrospective studies
Intervention group: 485
Control group: 704
ciNPWT (n = 485):
VAC: 4 studies
Prevena®/PICO®: 5 studies
Intervention group: 0.0–20.5%
Control group: 20.5–48.0%
I
Fowler, AL 2019 Surgeon [23]
Laparotomy for colorectal, general and gynaecological surgery
Systematic review of 4 RTCs and 5 retrospective studies
Intervention group: 454
Control group: 1016
ciNPWT (n = 454):
VAC: 4 studies
Prevena®/PICO: 4 studies
Intervention group: 2.9–12.5%
Control group: 7.2–44.0%
I
Tran, BNN 2019 J Surg Research [26]
Laparotomy for malignancy, ventral hernia repair, C‑section, complex abdominal wall repair
Meta-analysis of 2 RCTs and 9 retrospective studies
Intervention group: 681
Control group: 1042
ciNPWT (n = 681)
Intervention group: 15.0%
Control group: 28.0%
Significantly lower wound dehiscence rate in ciNPWT group (8.0% vs. 15.0%; p < 0.001); no significant difference in seroma or haematoma formation
I
Hyldig, N 2016 Br J Surg [27]
Mixed (total hip arthroplasty, total knee arthroplasty, hemiarthroplasty, extremity fractures, spine fractures, pelvic/acetabular/hip fractures, median sternotomy, abdominal wounds, breast reduction surgery)
Meta-analysis of 10 RCTs
Intervention group: 664
Control group: 647
ciNPWT (n = 664):
VAC: 4 studies
Prevena®/PICO®: 6 studies
Intervention group: 4.7%
Control group: 8.9%
Large heterogeneity between studies
I
De Vries, FEE 2016 Medicine [28]
Mixed (total hip arthroplasty, total knee arthroplasty, lower extremity fracture surgery, high-energy trauma, spine surgery, acetabular fracture surgery, abdominal surgery, cardiac surgery, vascular surgery, breast surgery, colorectal surgery)
Meta-analysis of 6 RCTs and 15 observational studies
RCTs: 562
Observational studies: 4560
ciNPWT:
VAC: 13 studies
Prevena®/PICO®: 8 studies
Intervention group: 1.3–20.4%
Control group: 2.8–53.1%
I
Strugala, V 2017 Surg Infect (Larchmt) [29]
Spine surgery, total hip arthroplasty, total knee arthroplasty, revision total hip arthroplasty, revision total knee arthroplasty, C‑section, breast reduction surgery, vascular surgery, laparotomy, colorectal surgery, ileostomy, sternotomy
Meta-analysis of 10 RCTs, 3 prospective studies, 3 retrospective studies
Overall: 1863 patients (2202 incisions)
RTCs: 1734 incisions
Prospective/retrospective studies: 468 incisions
ciNPWT (PICO®)
Intervention group: 5.2%
Control group: 12.5%
ciNPWT associated with lower wound dehiscence rate (12.8% vs. 17.4%), and reduced inpatient stay
I
Zwanenburg, PR 2019 Ann Surg [30]
Abdominal, cardiac, obstetric, plastic, orthopaedic/trauma, vascular surgery
Meta-analysis of 31 RCTs, 12 prospective observational studies, 39 retrospective studies
RCTs: 4398
ciNPWT applied for 1 to 14 days postoperatively
RCTs: relative risk (RR): 0.61; 95%CI: 0.49–0.76; p < 0.0001
High-level evidence that ciNPWT reduces SSI, low to very low evidence that ciNPWT reduces wound dehiscence rate, skin necrosis and seroma
I
Singh, DP
2018 Plast Reconstr Surg [32]
Abdominal, colorectal, obstetrics, orthopaedics and trauma, vascular, cardiac
Meta-analysis of 11 RCTs, 7 prospective studies, 12 retrospective studies
Overall: 9696 patients
ciNPWT
RCTs: odds ratio (OR): 2.7; 95%CI: 2.0–3.6; p < 0.0001
Observational studies: OR: 3.1; 95%CI: 2.3–4.2; p < 0.0001
ciNPWT associated with lower SSI rate over all indications, except for obstetrics
I
Shiroky, J 2020 Surgery [31]
Abdominal, orthopaedic, trauma, obstetric, general, vascular, cardiothoracic, plastic surgery, urology, neurosurgery
Meta-analysis of 44 RCTs
Overall: 5693 patients (6061 incisions)
ciNPWT (n = 5693)
Risk ratio (RR): 0.61; 95%CI: 0.49–0.73
Significant reduction in SSI (over all specialities and ciNPWT-devices), wound dehiscence and seroma rate
I
Singh, DP 2018 PRS Global Open [33]
Vascular, obstetric, plastic, general, cardiac surgery
Meta-analysis of 2 multi-center RCTs and 15 single-center RCTs
ciNPWT with foam dressing:
Intervention: 489
Control: 489
ciNPWT with multilayer dressing:
Intervention: 532
Control: 540
ciNPWT with foam dressing (n = 489)
ciNPWT with multilayer absorbent dressing (n = 532)
ciNPWT with foam dressing:
OR: 3.17; 95%CI: 2.17–4.65; p < 0.0001
ciNPWT with multilayer dressing:
OR: 1.7; 95%CI: 0.93–3.08; p = 0.08
ciNPWT with foam dressing associated with significant reduction in SSI rate; ciNPWT with multilayer absorbent dressing not associated with reduced SSI rate
Prevena® (KCI Medizinprodukte, Wiesbaden, Germany); PICO® (Smith & Nephew, Watford, UK); VAC® system (KCI Medizinprodukte, Wiesbaden, Germany)
ciNPWT closed-incision negative-pressure wound therapy, SSI surgical site infection, RCT randomised controlled trial
We identified seven meta-analyses analysing the impact of ciNPWT used for various surgical procedures. The meta-analysis by Hyldig et al. [27] of 10 RTCs included 664 patients in the intervention group and 647 patients in the control group. Standard VAC systems were used in 4 studies for ciNPWT and specifically designed ciNPWT systems in 6 studies. The overall SSI rate was 4.7% for the intervention group and 8.9% for the control group. The use of ciNPWT was associated with a significant reduction of SSI (relative risk [RR]: 0.54; 95%CI: 0.33–0.89) and seroma formation (RR: 0.48; 95%CI: 0.27–0.84), whilst there was no influence on development of wound dehiscence [27]. However, due to the heterogeneity of the studies included, analysing the effect of ciNPWT in trauma surgery, orthopaedic surgery, general surgery and cardiac surgery, the authors concluded that no general recommendations for the use of ciNPWT were possible (level I) [27]. In the same year, another meta-analysis was published by De Vries et al. [28], investigating six RCTs and 15 observational studies with 562 patients in the RTC and 4560 patients in the observational studies. Thirteen of the studies used a conventional (wound-specific) negative-pressure wound therapy (NPWT) system and eight studies a ciNPWT system [28]. SSI rates ranged between 1.3 and 20.4% for the ciNPWT group, and 2.8 and 53.1% for the wound NPWT group [28]. Overall, there was a significant reduction in SSI rates when ciNPWT was used, both for RCTs (OR: 0.56; 95%CI: 0.32–0.96; p = 0.040) and observational studies (OR: 0.30; 95%CI: 0.22–0.42; p < 0.0001). These results remained statistically significant when stratifying for clean and clean-contaminated procedures, as well as for different types of surgery. In trauma and orthopaedic procedures, however, this effect of ciNPWT vs. conventional dressings was no longer measurable [28]. With an overall low evidence according to the GRADE methodology, the prophylactic use of ciNPWT seemed to significantly reduce SSI rates (level I) [28]. In the third meta-analysis, 10 RCTs, three prospective studies and three retrospective studies were analysed with regards to ciNPWT for several surgical indications. Overall, the rate of SSI was significantly lower in patients treated with ciNPWT in comparison to controls (5.2% vs. 12.5%). Significantly fewer wound healing deficits were also observed in the ciNPWT-treated group as compared to controls (12.8% vs. 17.4%). Of note, although the reduction in SSI was present irrespective of the surgical procedure performed (e.g. orthopaedic, colorectal), the number needed to treat was lower in the case of surgical interventions with high complication rates [29]. Moreover, patients in the intervention group had a shorter hospital length of stay vs. controls. The authors concluded that ciNPWT was a viable option for various surgical indications to reduce the rate of wound healing deficits, SSI and hospital length of stay (level I) [29]. In three other meta-analyses, a positive influence of ciNPWT on postoperative wound healing, reducing the rate of SSI and, to a lesser extent, wound dehiscence and seroma formation, was confirmed (level I) [3032]. Of note, in the meta-analysis by Singh et al., two different ciNPWT systems were compared, namely one using a foamed dressing and one using a multilayer absorbent dressing. Whilst the ciNPWT device with foamed dressing significantly reduced the rate of SSI, the other absorbent one was not associated with a significant reduction in SSI rate [33].

Plastic and reconstructive surgery

Plastic surgery was one of the early adopters of ciNPWT, lending its use for complication-prone wounds or surgical sites submitted to increased tensile forces. For example, a high rate of postoperative seroma can be observed in surgical cases on certain large flap donor sites [34, 35], or following lymph node dissection (e.g. for malignant melanoma) [36]. Body contouring procedures, especially in the massive weight loss patient, are also prone to developing wound complications or SSI [37]. Several retrospective and prospective publications that investigated the effects of ciNPWT in plastic surgery are summarized in Table 3.
Table 3
Summary of studies on closed-incision negative-pressure wound therapy (ciNPWT) in plastic surgery
Level of evidence
Study
Procedure
Design
Patients
Intervention
Rate of SSI
Comments
IV
Jorgensen, MG 2019 J Plast Reconstr Aesthetic Surg [38]
Inguinal lymphadenectomy
Retrospective
Intervention group: 14
Control group: 41
ciNPWT (n = 14)
Intervention group: 42.9%
Control group: 65.9%
ciNPWT-treatment more cost-effective than conventional wound care
IV
Tauber, R 2013 J Plast Reconstr Aesthetic Surg [39]
Inguinal lymphadenectomy
Retrospective
Intervention group: 8
Control group: 16
ciNPWT (n = 8)
N/A
Significant reduction in formation of lymphocele, lymphedema and lymphorrhea following ciNPWT
IV
Bollero, D 2015 Int Wound J [40]
Pathologic scar excision
Retrospective case series
8
ciNPWT (n = 8) with Prevena
N/A
One premature removal of ciNPWT due to failure in achieving negative pressure
IV
Abatangelo, S 2018 Obes Surg [41]
Abdominoplasty
Retrospective case-control study
Intervention group: 5
Control group: 6
ciNPWT (n = 5)
N/A
Twice times faster wound healing in ciNPWT-treated patients
IV
Gabriel, A 2016 Plast Reconstr Surg—Glob Open [42]
Two-stage breast reconstruction following mastectomy
Case-series
13 (25 breasts)
ciNPWT (25 breasts)
12.0%
IV
Gabriel, A 2018 Plast Reconstr Surg—Glob Open [43]
Mastectomy
Retrospective
Intervention group: 177 (331 breasts)
Control group: 170 (334 breasts)
ciNPWT (n = 177; 331 breasts)
Intervention group: 2.1%
Control group: 4.5%
Lower rate of wound dehiscence, necrosis, seroma formation in ciNPWT group
II
Peter Suh, HS 2016 Plast Reconstr Surg—Glob Open [44]
Superficial circumflex iliac artery perforator flap harvest
Prospective randomised controlled trial
Intervention group: 50
Control group: 50
ciNPWT (n = 50) for 5 days
Intervention group: 0.0%
Control group: 2.0%
Lower amount of fluid collected and earlier removal of suction drainage in ciNPWT-treated patients
II
Angspatt, A 2017 Arch Plast Surg [45]
Latissimus dorsi flap harvest
Prospective randomised controlled trial
Intervention group: 20
Control group: 20
ciNPWT (n = 20)
N/A
15.0% vs. 70.0% seroma formation rate in intervention vs. control group; lower amount of percutaneous aspirated volume as well as total number of percutaneous aspirations following ciNPWT
II
Muller-Sloof, E 2018 J Tissue Viability [46]
Flap donor site
Prospective randomised controlled trial
Intervention group: 25
Control group: 26
ciNPWT (n = 25)
Wound dehiscence rate
Intervention group: 8.0%
Control group: 34.6%
III
Ferrando, PM 2018 Plast Reconstr Surg—Glob Open [47]
Oncological breast surgery
Prospective cohort study
Intervention group: 17 (25 breasts)
Control group: 20 (22 breasts)
ciNPWT (n = 17; 25 breasts) for 7 days
Overall complication rate
Intervention group: 4.0%
Control group: 45.0%
II
Tanaydin, V 2018 Aesthetic Plast Surg [48]
Bilateral breast reduction
Prospective randomised intra-individually controlled trial
32 patients (64 breasts)
Intervention: 32 breasts
Control: 32 breasts
ciNPWT (n = 32; 32 breasts) with PICO
Overall complication rate
Intervention group: 15.0%
Control group: 31.3%
II
Galiano, RD 2018 Plast Reconstr Surg—Glob Open [49]
Bilateral breast reduction
Multicentre prospective randomized trial
185 patients (185 breasts)
Intervention: 185 breasts
Control: 185 breasts
ciNPWT (n = 185; 185 breasts) with PICO
Overall complication rate
Intervention group: 56.8%
Control group: 61.8%
Rate of SSI not significantly different (2.0% vs. 3.0%; ciNPWT vs. control)
III
Abesamis, GM 2019 Plast Reconstr Surg—Glob Open [50]
Abdominoplasty
Prospective cohort study
Intervention group: 9
Control group: 7
ciNPWT (n = 9) with Prevena for 7 days
N/A
Significantly lower drainage volume and faster removal of drains in ciNPWT-group comparison to control-group
Prevena® (KCI Medizinprodukte, Wiesbaden, Germany); PICO® (Smith & Nephew, Watford, UK)
ciNPWT closed-incision negative-pressure wound therapy, SSI surgical site infection, N/A not applicable, RCT randomised controlled trial
Starting with the retrospective publications, Jorgensen et al. [38] applied ciNPWT in 14 of 55 malignant melanoma patients after inguinal lymph node dissection, the remainder underwent standard postoperative wound care. Seroma formation was significantly reduced in the ciNPWT group in comparison to the control group (28.6% vs. 90.3%; p < 0.001). A statistically non-significant reduced trend for developing SSI favoured ciNPWT (42.9% vs. 65.9%; p = 0.130), while no effect on lymphedema formation was observed (35.7% vs. 51.2%; p = 0.330). The intervention group was more cost-effective than the conventional wound care ($ 911.2 vs. $ 2542.7; p < 0.05; level IV) [38]. In a study by Tauber et al. [39], ciNPWT was applied after inguinal lymph node dissection for penile or urethral cancer in 8 patients, whilst 16 patients underwent conventional wound care. Patients in the intervention group had a significantly reduced length of hospital stay, less formation of lymphedema (0.0% vs. 46.0%), lymphocele (20.0% v. 62.0%) and persistent lymphorrhea (7.0% vs. 45.0%; level IV) [39]. In a case series of 8 patients after surgical excision of pathological scars, ciNPWT was applied for 8 days postoperatively [40]. In all but one patient, an overall good compliance and complication-free follow-up was noted (in one case the ciNPWT system had to be removed prematurely after one day due to insufficient vacuum sealing; level IV) [40]. In a study by Abatangelo et al. [41], five of 11 cases of post-bariatric abdominoplasty received postoperative ciNPWT, whilst the remaining patients underwent conventional wound care. The authors observed a faster healing rate (10.8 ± 5.0 days vs. 23.0 ± 7.0 days) and reduced “minor local complication rate” (0% vs. 80%) in the intervention vs. control groups, respectively. The Vancouver Scar Scale at 90 days also demonstrated better results in the intervention group. The observations led the authors to conclude that ciNPWT reduced the risk for developing minor wound complications and improved surgical outcome (level IV) [41]. The influence of ciNPWT following two-stage expander/implant-based postmastectomy reconstruction [42] revealed wound complications in three of 25 breasts of 13 patients (12.0%) and one flap necrosis, which required reoperation (4.0%). On 3‑month follow-up, 24 of the 25 breasts were closed without any further deviation (96.0%; level IV) [42]. Two years thereafter, the same set of authors published a larger retrospective case–control series on almost the same topic [43]. They observed closed incisions in 665 breasts from 356 patients, of which 177 (331 breasts) were treated by ciNPWT and 179 (334 breasts) by conventional wound care. The overall complication rate was lower in the ciNPWT group as compared to the control group (8.5% vs. 15.9%; p = 0.009), as was the rate of SSI (2.1% vs. 4.5%; p = 0.023), of wound dehiscence (2.4% vs. 5.4%; p = 0.018), of seroma formation (1.8% vs. 5.7%; p = 0.011), of tissue necrosis (5.1% vs. 9.3%; p = 0.007), of time to drain removal (9.9 days vs. 13.1 days; p < 0.001) and, last but not least, surgical revision rate (2.4% vs. 5.4%; p = 0.050). The authors concluded that ciNPWT may be used for reducing postoperative complications following postmastectomy breast reconstruction (level IV) [43].
This paragraph highlights the prospective publications in plastic surgery: in 2016, an RCT investigated conventional wound therapy (n = 50) vs. ciNPWT applied for 5 days (n = 50) after harvesting superficial circumflex iliac artery perforator flaps [44]. Significantly lower amounts of fluid were collected in ciNPWT wounds in comparison to controls (23.3 ± 18.4 ml vs. 100.5 ± 140.7 ml; p < 0.001), resulting in a significantly earlier removal of suction drains (3.3 ± 1.3 days vs. 6.1 ± 5.0 days; p = 0.008). Interestingly, an increase in skin blood perfusion at 5 days was observed in the ciNPWT group. Overall, one wound dehiscence developed in the control group vs. none in the intervention group (level II) [44]. An RCT in 2017 including 40 patients with latissimus dorsi flap donor sites for breast reconstruction [45] detected in 3 of 20 patients with ciNPWT a seroma formation (15.0%) vs. in 14 of 20 patients (70.0%) in the control group with conventional wound care (OR: 0.07). The mean number of percutaneous seroma releases and the totally aspirated volume was lower in the ciNPWT group as compared to the control group. No statistically significant difference for duration or total volume of wound drainage was found (level II) [45]. An RCT—(DEhiscence PREvention Study) (DEPRES)—after autologous breast reconstruction with a deep internal epigastric perforator (DIEP) or profunda artery perforator (PAP) flap [46] included a total of 51 female patients. Twenty-five patients were treated with ciNPWT and 26 patients with adhesive strips for managing the donor site. The ciNPWT group had less wound dehiscence vs. control (8.0% vs. 34.6%; p = 0.038; level II) [46]. ciNPWT [47] was also applied in an RCT for 7 days following oncological breast surgery and included 37 patients with 47 breasts. In the ciNPWT group (n = 17; 25 breasts), complications were seen in 4.0%, as compared to 45.0% in the control group (n = 20; 22 breasts, conventional post-surgical dressings; p = 0.001; level III) [47]. Furthermore, two RCTs have been published on the use of ciNPWT following bilateral breast reductions [48, 49]. In the smaller study, Tanaydin et al. [48] used an intraindividual comparison study design in 32 patients, where the ciNPWT device was used on one breast and conventional adhesive strips on the other. Overall, the wound complication rate was lower in the intervention group (15.6% vs. 31.3%; p < 0.004). Statistically significant as well as improved pain scores, scar quality and subjectively rated aesthetic appearance were also observed in the ciNPWT-treated breasts (level II) [48]. In the second, larger study by Galiano et al. [49], 200 patients undergoing bilateral breast reduction surgery were prospectively enrolled in a multicentre trial. With the same intraindividual comparison design, one breast received ciNPWT and the other standard wound care postoperatively. The 21-day assessment was completed in 185 patients. At that time, 56.8% of ciNPWT-treated breasts (n = 113) had developed wound healing complications, in comparison to 61.8% (n = 123) in controls (p = 0.004). Interestingly, the rate of SSI demonstrated no statistically significant difference (2.0% vs. 3.0%). The authors concluded that wound healing complications following bilateral breast reduction surgery can be reduced by applying ciNPWT (level II) [49]. The prospective series of Abesamis et al. in 2019 [50] analysed the use of ciNPWT after abdominoplasty in 16 female patients. Nine patients received an ciNPWT and 7 patients served as control (standard postoperative wound care). There was a statistically significant reduction of fluid drainage in the ciNPWT group vs. control (p < 0.0001), as there was for time to drain removal (5.3 ± 1.6 days vs. 10.6 ± 2.9 days; p < 0.001; level III) [50].

Cardiac surgery

Between 1 and 3% of patients risk developing SSI following cardiac surgery, with the rate strongly depending on the presence of obesity, diabetes, other peri- and postoperative complications, and coronary artery bypass grafting using both internal thoracic arteries [51]. Therefore, measurements to lower the risk of SSI, especially in high-risk multimorbid patients, are required. In this respect, ciNPWT in cardiac surgery has gained more attention over the past few years (Table 4).
Table 4
Studies published on usage of closed-incision negative-pressure wound therapy (ciNPWT) following cardiac surgery
Level of evidence
Study
Procedure
Design
Patients
Intervention
Rate of SSI
Comments
IV
Atkins, BZ 2009 Surg Innov [52]
Sternotomy for cardiac disease
Retrospective case–control study
Intervention group: 57
Control group: 213
ciNPWT (n = 57) for 4 days
Intervention group: 0.0%
Control group: 0.5%
IV
Colli, A 2011 J Cardiothorac Surg [53]
Sternotomy for cardiac disease
Retrospective case series
10
ciNPWT (n = 10) for 5 days
0.0%
IV
Atkins, BZ 2011 Int Wound J [54]
Sternotomy for open myocardial revascularisation surgery
Retrospective case–control study
Intervention group: 10
Control group: 10
ciNPWT (n = 10) for 4 days
0.0%
Peristernal perfusion following LIMA harvest restored to 100% with ciNPWT
III
Grauhan, O 2013 J Thorac Cardiovasc Surg [55]
Sternotomy for cardiac disease
Prospective comparative study without randomization
Intervention group: 75
Control group: 75
ciNPWT (n = 10) for 6–7 days
Intervention group: 4.0%
Control group: 16.0%
III
Grauhan, O 2014 Int Wound J [56]
Sternotomy for cardiac disease
Prospective study with retrospective comparison
Intervention group: 237
Control group: 3508
ciNPWT (n = 10) for 6–7 days
Intervention group: 1.3%
Control group: 3.4%
II
Witt-Majchrzak, A 2015 Pol Przegl Chir [57]
Sternotomy for open heart surgery
Prospective randomized controlled trial
Intervention group: 40
Control group: 40
ciNPWT (n = 40) with negative pressure of −80 mm Hg
Intervention group: 7.5%
Control group: 25.0%
Early removal of ciNPWT in one patient due to bleeding
IV
Santarpino, G 2015 Ostomy Wound Manage [58]
Sternotomy for open myocardial revascularisation surgery
Retrospective case–control study
Intervention group: 21
Control group: 108
ciNPWT (n = 21) for 5 days
Intervention group: 0.0%
Control group: 5.6%
Sternal dehiscence rate lower in intervention group (0.0% vs. 3.7%)
IV
Reddy, VS 2016 Cureus [59]
Sternotomy for cardiac disease
Retrospective case series
27
ciNPWT (n = 27) for 5.6 days (average)
22.2%
IV
Jennings, S 2016 Heart Lung Circ [60]
Sternotomy for heart surgery
Retrospective case series
62
ciNPWT (n = 62)
1.6%
IV
Philip, B 2017 J Wound Care [62]
Sternotomy for cardiac disease
Retrospective case series
10
ciNPWT (n = 10)
0.0%
III
Gatti, G 2018 Updates Surg [63]
Sternotomy for open myocardial revascularisation surgery
Prospective single-arm study
53
ciNPWT (n = 53)
3.4%
III
Ruggieri, VG 2019 Hear Surgery Forum [65]
Sternotomy for myocardial revascularisation using BIMA
Prospective study, propensity score matching
Intervention group: 161
Control group: 266
128 matched pairs
ciNPWT (n = 161) for 5–7 days
Intervention group: 10.2%
Control group: 10.9%
Mediastinitis:
Intervention group: 5.5%
Control group: 10.2%
ciNPWT closed-incision negative-pressure wound therapy, SSI surgical site infection, LIMA left internal mammary artery, BIMA bilateral internal mammary artery
Atkins et al. [52] published a retrospective study of 57 adult cardiac patients receiving ciNPWT dressing, who were at a high-risk of developing deep sternal wound infection and mediastinitis after sternotomy. They were compared to 213 patients with a low risk for sternal wound infection and who received standard gauze wound dressings. Treatment duration was 4 days. In the ciNPWT group, the authors observed no infected wound, while they “expected”—based on the preoperative risk factors—at least three wound infections. There was one wound infection in the control group of low-risk patients. This led the authors to conclude that ciNPWT reduced the incidence of sternal wound infections and dehiscence (level IV) [52]. Colli et al. [53] published a retrospective review of 10 high-risk patients for SSI following cardiac surgery. All patients received a ciNPWT system for 5 days and none of them subsequently developed an SSI. They concluded that ciNPWT systems were safe and easy to use and can be beneficial in healing of sternal wounds in high-risk patients (level IV) [53]. In the same year, Atkins et al. [54] published a study regarding peristernal perfusion evaluated by laser Doppler flowmetry in patients following myocardial revascularization via median sternotomy. In detail, the authors analysed the influence of left internal mammary artery (LIMA) harvest on postoperative peristernal perfusion and the potential impact of subsequently applied ciNPWT. Altogether, 20 patients were included in the study, of whom 10 received ciNPWT for 4 days (intervention group) and 10 a standard gauze dressing (control group) [54]. All patients underwent daily assessment of peristernal perfusion. Overall, there was no sternal wound infection. In the ciNPWT group, however, there was improved peristernal perfusion in comparison to the control group. LIMA harvest reduced peristernal perfusion rates by more than 25%, but a postoperatively applied ciNPWT device enhanced peristernal perfusion to 100%, thus actually compensating for the loss. Consequently, application of ciNPWT may improve peristernal perfusion in high-risk patients following median sternotomy, potentially reducing SSI (level IV) [54]. Grauhan et al. [55] published a prospective comparative study without randomization of 150 consecutive patients with BMI >30 who had undergone median sternotomy. Patients in the intervention group (n = 75) were treated with ciNPWT for 6–7 days, whilst patients in control group (n = 75) received standard gauze dressing. The primary endpoint was sternal wound infection developing within 90 days following surgery [55]. Sternal wound infection rate in the ciNPWT group was 4% vs. 16% in control group. Therefore, the authors concluded that application of ciNPWT decreases the postoperative wound infection rate in patients following median sternotomy (level III) [55]. The same authors published another study a year thereafter [56], prospectively evaluating 237 patients with median sternotomy and application of ciNPWT for 6–7 days. This group of patients was compared to a historic cohort of 3508 patients who had been treated with standard dressings [56]. Primary endpoint was sternal wound infection during the first 30 postoperative days. Patients in the ciNPWT group developed significantly fewer sternal wound infections (1.3% vs. 3.4%; p < 0.05; odds ratio: 2.74) in comparison to the control group, which is why the authors concluded that ciNPWT significantly reduces deep sternal wound infections following median sternotomy (level III) [56]. In the same year, the first randomized controlled trial was published by Witt-Majchrzak et al. [57], analysing 80 patients after sternotomy for open heart surgery. In the intervention group (n = 40), patients were treated with a ciNPWT system and a negative pressure of 80 mm Hg, whilst patients in the control group (n = 40) received standard dressings [57]. In this study, statistically fewer sternal wound infections were observed in patients with ciNPWT in comparison to patients in the control group (7.5% vs. 25.0%; p = 0.034; level II) [57]. Santarpino et al. [58] published a retrospective study on 129 patients undergoing myocardial revascularization with bilateral internal mammary artery harvest. In 21 of these patients, the authors applied ciNPWT for 5 days. The remaining patients received a standard gauze dressing [58]. Patients in the ciNPWT group were generally younger, the surgical priority less urgent and general risk for SSI lower, yielding a selection bias. In comparison to the control group with 5.6% sternal wound infections, the ciNPWT group had no infections, which was not statistically significant (p = 0.336). Sternal dehiscence rate was also lower (0.0% vs. 3.7%), but statistically not significant (p = 0.487). Of note, one patient in the ciNPWT group required premature removal of the ciNPWT due to bleeding (level IV) [58]. In 2016, Reddy et al. [59] published a retrospective review on 27 high-risk patients with mixed cardiac pathology receiving ciNPWT. The majority (78%) of these patients had intact incisions showing good re-approximation of the skin 30 days following surgery. Six of the 27 patients developed wound healing problems (22.2%), of whom one required re-admission to hospital for intravenous antibiotics (level IV) [59]. Similarly, Jennings et al. [60] published a retrospective study of 62 patients treated with ciNPWT after median sternotomy. They divided patients into a high- and a low-risk group for SSI and compared actual infection rates to predicted infection rates, according to the Fowler score [61]. Significantly lower infection rates were observed in both cohorts, with only one patient developing sternal wound infection. The authors concluded that ciNPWT should be considered in patients at a high risk for sternal wound infection, like in diabetics, elderly and obese patients (level IV) [60]. Phillip et al. [62] published a retrospective review of 10 patients after median sternotomy with mixed cardiac pathology. All incisions healed without complications. They suggested that the use of ciNPWT should be considered for sternotomy patients with comorbidities increasing the risk of SSI (level IV). More recently, Gatti et al. [63] published a prospective study of 53 high-risk patients undergoing coronary artery bypass surgery using both internal mammary arteries. They compared the actual rate of deep sternal wound infections to the predicted rate using two different scoring systems. The authors observed lower infection rates than predicted from the Gatti score [64] (3.4% vs. predicted 5.8%) and slightly higher rates than predicted by the Fowler score (3.4% vs. predicted 2.3%) [61]. The authors stated that application of ciNPWT may reduce the risk of deep sternal wound infections following bilateral internal mammary artery harvest (level III) [63]. Furthermore, Ruggieri et al. [65] published a prospective non-randomized study on patients undergoing isolated CABG using BIMA grafts, where ciNPWT was used in 161 patients and conventional sterile wound dressing was used in 266 patients. Propensity score matching was performed to allow statistical “pseudo-randomisation”, resulting in 128 matched pairs with similar characteristics. The rate of SSI was similar in both groups, whereas the rate of deep SSI and mediastinitis was lower in the ciNPWT group as compared to the control group, without reaching statistical significance (level III).

Vascular surgery

Following vascular surgery, superficial SSIs were predicted to develop in up to 76.0% of patients, deep SSIs in up to 24.0% and SSIs with graft exposure were observed in up to 6.1% of patients [66]. In these often multimorbid patients requiring vascular procedures, reduction of SSI risk is needed to prevent consequences such as prolonged hospital length of stay, ICU admission, increased morbidity and mortality [67]. Different retrospective and prospective studies have been published in recent years, investigating the potential positive effect of ciNPWT on postoperative outcomes of patients undergoing vascular surgery (Table 5).
Table 5
Summary of studies investigating the effect of closed-incision negative-pressure wound therapy (ciNPWT) on outcome following vascular surgery
Level of evidence
Study
Procedure
Design
Patients
Intervention
Rate of SSI
Comments
IV
Matatov, T 2013 J Vasc Surg [68]
Femoral cutdown for vascular procedures
Retrospective case–control study
Intervention group: 52
Control group: 63
ciNPWT (n = 52)
Intervention group: 6.0%
Control group: 30.0%
III
Weir, G 2014 Int Wound J [70]
Bilateral groin incision for vascular procedures
Prospective pilot study
8 (one side treated with ciNPWT, the other with standard wound dressing)
ciNPWT (n = 8, one side)
Side with ciNPWT: 2 non-significant wound complications
Side with standard dressing: 3 significant wound complications
Preliminary results of ongoing study
II
Lee, AJ 2017 Interact Cardiovasc Thorac Surg [83]
Greater saphenous vein harvest for cardiac surgery
Prospective single-centre randomised controlled trial
Intervention group: 33
Control group: 29
ciNPWT (n = 33), for 4.8 days (average)
II
Lee, K 2017 J Vasc Surg [71]
Femoral artery exposure for vascular procedures
Prospective randomised controlled trial
Intervention group: 53
Control group: 49
ciNPWT (n = 53)
Intervention group: 11.0%
Control group: 19.0%
Shorter hospital stay in intervention group (6.4 vs. 8.9 days)
II
Pleger, SP 2018 Int Wound J [72]
Groin incisions for vascular procedures
Prospective randomised trial
Intervention group: 58
Control group: 71
ciNPWT (n = 58)
Intervention group: 8.6%
Control group: 4.3%
Same results observed for subgroups at 5–7 days and 30 days
II
Engelhardt, M 2018 Int Wound J [73]
Groin incisions for vascular procedures
Prospective randomised trial
Intervention group: 64
Control group: 68
ciNPWT (n = 64) for 5 days
Intervention group: 14.0%
Control group: 28.0%
Same trend visible for early infections (intervention vs. control group: 6.0% vs. 15.0%)
II
Gombert, A 2018 Eur J Vasc Endovasc Surg [74]
Groin incisions for vascular procedures
Prospective randomised trial
Intervention group: 98
Control group: 90
ciNPWT (n = 98)
Intervention group: 13.2%
Control group: 33.3%
II
Kwon, J 2018 J Vasc Surg [75]
Groin incisions for vascular procedures
Prospective randomised controlled trial
Intervention group: 59
Control group: 60
ciNPWT (n = 59)
Intervention group: 8.5%
Control group: 25.0%
Separate control group of low-risk patients with SSI rate of 4.8%
I
Svensson-Björk, R 2019 Br J Surg [76]
Groin incisions for arterial surgeries
Meta-analysis of 7 RCTs
Intervention group: 512
Control group: 537
ciNPWT (n = 512)
OR: 0.35 (95%CI: 0.24–0.5; p < 0.001)
High-quality RCTs with cost-effectiveness analyses needed
III
Benrashid, E 2019 J Vasc Surg [77]
Vascular procedures requiring infrainguinal incisions
Prospective study
Intervention group: 225
Control group: 279
ciNPWT (n = 225)
Intervention group: 9.8%
Control group: 19.0%
(p < 0.01)
I
Antoniou, GA 2019 J Vasc Surg [79]
Groin incisions in vascular surgery
Meta-analysis of 7 RCTs
Intervention group: 362
Control group: 371
ciNPWT
(n = 362)
OR, 0.36; 95% CI, 0.24 to 0.54; P < 0.001
I
Wee, IJY 2019 Eur J Vasc Endovasc Surg [80]
Vascular procedures
Meta-analysis of 5 RCTs
Intervention group: 317 (332 incisions)
Control group: 345 (359 incisions)
ciNPWT (n = 317; 332 incisions)
RR = 0.31, 95% CI 0.21–0.47
II
Hasselmann, J 2020 Ann Surg [78]
Elective open vascular surgery with inguinal incisions
Prospective randomised controlled trial
Unilateral incisions:
Intervention group: 59
Control group: 61
Bilateral incisions: 19 (patients)
ciNPWT
n = 78
11.9% vs 29.5% in the unilateral group (n = 120), 5.3% vs 26.3% in the bilateral group (n = 19); combined p = 0.02
I
Sexton, F 2020
Int J Surg [81]
Groin incisions following vascular surgery
Meta-analysis of 7 (3) RCTs
No. of incisions:
Intervention group: 461
Control group: 474
ciNPWT (461 incisions)
RR 0.47; 95%CI 0.31–0.70; three studies, 422 patients
I
Gombert, A 2020 J Vasc Surg Venous Lymphat Disord [82]
ciNPWT usage over closed groin incisions in vascular surgery
Meta-analysis of 6 RCTs
Intervention group: 362
Control group: 371
ciNPWT
(n = 362)
Intervention group: 41
Control group: 107
OR = 3.06, 95% CI [2.05, 4.58], p < 0.05
ciNPWT closed-incision negative-pressure wound therapy, SSI surgical site infection, RCT randomised controlled trial
Matatov et al. [68] retrospectively analysed 90 patients with altogether 115 femoral cutdown procedures for vascular surgery. Patients were divided into two groups according to the type of wound dressing (ciNPWT: n = 52; standard wound dressing: n = 63). Wounds were evaluated 7 and 30 days after surgery and the Szilagy classification used to assess grade of SSI [69]. The ciNPWT group developed significantly fewer groin infections in comparison to the control group (30.0% vs. 6.0%). The authors concluded that ciNPWT significantly decreased the incidence of groin wound infections (level IV) [68]. Weir et al. [70] performed a prospective intraindividual case–control study in 8 patients with bilateral groin incisions. ciNPWT was placed on one side and standard dressing on the other side. No significant wound complications occurred in cases where ciNPWT was used (one small superficial haematoma, one small superficial wound necrosis, both treated conservatively), as compared to three significant complications in wounds treated with standard dressings (two seromas and one deep wound necrosis, all of them requiring revision surgery) [70]. A potential reduction in wound complications without an increase in haemorrhage rate was observed in high-risk patients undergoing vascular surgery. This article, however, was based on preliminary results of an ongoing study. Therefore, the authors stated that more investigation was required to prove this observation (level III) [70].
Furthermore, we found five randomised controlled trials and one meta-analysis published in the literature analysing the use of ciNPWT in vascular surgery. Lee K et al. [71] performed a single-centre randomised controlled trial including 192 high-risk patients for SSI who underwent surgical exposure of the femoral artery for different vascular procedures. Surgical wounds were closed primarily and covered either with standard gauze dressings (n = 49) or ciNPWT (n = 53). Primary outcome was the 30-day SSI incidence in the groin wound. Lower but non-significant wound infection rates in the ciNPWT group were observed in comparison to the control group (11% vs. 19%, p = 0.240) [71]. However, there was a significantly shorter length of stay (6.4 vs. 8.9 days, p = 0.01) in the ciNPWT group (level II) [71]. Pleger et al. [72] reported results of a prospective randomized single-centre study. They analysed 100 patients with 129 groin incisions for vascular procedures. Patients were divided into two groups according to the wound dressing used. The intervention group received a ciNPWT system (n = 58) and the control group (n = 71) conventional adhesive dressings. The wounds were followed up for 30 days. There were significantly fewer wound healing complications in the ciNPWT group than in the control group (8.6% vs. 4.3%; p < 0.005) [72]. The same results were reported for subgroups evaluated at 5 to 7 days (0.0% vs. 21.1%; p < 0.005) and 30 days (8.6% vs. 21.1%; p = 0.230) postoperatively, and for revision surgeries within the first 30 postoperative days (1.7% vs. 14.1%; p = 0.022). The authors concluded that ciNPWT significantly reduced the incidence of SSI and revision procedures after vascular surgery (level II) [72]. Engelhardt et al. [73] investigated 132 consecutive patients who received longitudinal femoral incisions for different vascular procedures. Patients were randomized into two groups: in the intervention group (n = 64), ciNPWT was applied for 5 days, and in the control group (n = 68), conventional absorbent dressing was used [73]. Wounds were evaluated after 5 and 42 days. The infection rate was lower in the ciNPWT group as compared to the control group without reaching statistical power (14.0% vs. 28.0%; p = 0.055). The same trend was observed for early infections (6.0% vs. 15.0%; p = 0.125). Although the authors saw encouraging effects with ciNPWT, the study failed to demonstrate significant efficacy to reduce groin infections (level II) [73]. Gombert et al. [74] reported results of the AIMS trial. This was a randomized prospective trial evaluating 188 patients of two study centres who had longitudinal femoral incisions for vascular procedures. 45% of these procedures were reoperations. There were significantly less SSI in the intervention group with ciNPWT (n = 98) as compared to the control group (n = 90) using standard wound dressing (13.2% vs. 33.3%; p = 0.002) [74]. This RCT confirmed a benefit of ciNPWT devices in reducing the occurrence of groin infections in vascular surgery (level II) [74]. Kwon et al. [75] published a prospective randomized controlled single-institution trial on 123 groin incisions in high-risk patients for various vascular procedures. Patients were randomized into two groups depending on the wound dressing used, being either a standard gauze dressing in the control group (n = 60) or a ciNPWT device in the intervention group (n = 59). There was another group of patients at a low risk for SSI (n = 21) who were not randomized but served as an additional low-risk control. The primary endpoint was the incidence of a major groin complication within 30 days. The low-risk group had a 4.8% wound complication rate. There was a significant increase in the infection rate in the high-risk control group as compared to the ciNPWT group (25.0% vs. 8.5%; p < 0.001) [75]. Patients in the high-risk control group also had higher reoperation (18.3% vs. 8.5%; p < 0.05) and readmission rates (16.7% vs. 6.8%; p < 0.05). However, there was no significant difference in the length of stay (10.6 days vs. 10.6 days) or average costs associated with the treatment assignment ($ 36,537 vs. $ 30,492; p = 0.11) between the patient groups. This study supported the use of ciNPWT in vascular surgery, especially in patients at a high risk for SSI (level II) [75]. Svensson-Björk et al. [76] published a meta-analysis on ciNPWT use in groin incisions for arterial surgery, including seven RCTs with 1049 incisions (intervention group: n = 512; control group: n = 537). According to their analysis, a significant reduction in SSI with ciNPWT (OR: 0.35; 95%CI: 0.24–0.50; p < 0.001) was observed in comparison to the control group. The heterogeneity between the included studies was low and the quality of evidence was moderate. In a subgroup analysis of 363 incisions from three studies of patients with lower limb revascularization, a similar reduction in SSI (OR: 0.37; 95%CI: 0.22–0.63; p < 0.001) could be observed [76]. The authors concluded that ciNPWT use in groin incisions after arterial procedures significantly reduced the incidence of SSI as compared to standard wound dressings. However, they also stressed the need for more high-quality RCTs with cost-effectiveness analyses (level I) [76]. Benrashid et al. [77] published a review of prospectively collected data in 504 patients, of whom 225 were treated with ciNPWT. Patients had mixed vascular procedures with infrainguinal incisions. They observed significantly fewer SSI with ciNPWT (9.8% vs. 19.0% with standard dressings; p < 0.01) along with decreased perioperative mortality (5.8% vs 11.2%; p = 0.04). They concluded that the use of ciNPWT devices decreased the incidence of infrainguinal wound infections (level III). This observation could be confirmed in the Inguinal Vascular Surgical Wound Protection by Incisional Negative Pressure Wound Therapy (INVIPS) prospective randomised study by Hasselman et al. [78], investigating the use of ciNPWT following inguinal incisions for vascular surgery. A lower incidence of SSI in the ciNPWT group compared to the control group was observed (level II; Table 5). In line with this, Antoniou et al. [79] published a meta-analysis of six randomized controlled trials reporting on 733 groin incisions, discovering that patients with ciNPWT had a lower risk of SSI and revision surgery, and shorter hospital stays (level I). Wee et al. [80] published a meta-analysis of five randomized controlled trials including 662 patients. The overall risk of infection was lower for the ciNPWT group. Specifically, the risk of Szilagyi grade I and III infections was significantly reduced in the ciNPWT group (level I), whilst there was no significant difference with regards to Szilagyi grade II infections. Similarly, Sexton et al. [81] published a meta-analysis of seven RCTs, concluding that ciNPWT may reduce the incidence of groin wound complications following vascular surgery (level I). According to the meta-analysis comprising six RCTs by Gombert et al. [82], ciNPWT use was associated with a significant positive effect on postoperative wound healing (I).
Great saphenous vein (GSV) harvests have been one of the most common complication-prone interventions for coronary artery bypass grafting and contributed significantly to postoperative patient morbidity. For this review only one published feasibility study by Lee AJ et al. [83]—a single-centre randomized controlled trial with 64 patients—was found. Primary endpoint was feasibility of ciNPWT on GSV harvest sites in 35 patients (intervention group), potential complications and rate of system failure. Secondary endpoints were SSI rates, leg complications, hospital length of stay and quality of life at 6 weeks post-surgery in the intervention group in comparison to the control group (n = 29) [83]. The authors observed no serious complications associated with ciNPWT, except for the device requiring discontinuation in two cases and developing an allergic contact dermatitis in one. In comparison to the control group, ciNPWT patients had an earlier date of discharge (6 vs. 10 days, p = 0.008), increased ability for self-care (p = 0.023) and quality of life (p = 0.039) at initial assessment, and increased mobility at initial and follow-up assessment (p = 0.0117 and 0.012) [83]. The authors concluded that ciNPWT was safe to use, improved postoperative recovery and had a prolonged impact on mobility at 6 weeks post-surgery [83]. Nevertheless, they also pointed out that larger studies were needed to assess ciNPWT effects in patients with GSV harvest (level II) [83].

Discussion

Published literature on the use of ciNPWT for various surgical indications expresses positive views with regard to clinical experiences. Improved postoperative wound healing, reduced rate of SSI and shortened hospital length of stay were among the reported benefits. 42 of 59 analysed studies (71.2%) discovered a statistically significant beneficial effect of ciNPWT application for incision management in comparison to conventional wound care, 10.2% failed to identify any differences (n = 6) and in 18.6% (n = 11) results were inconclusive. Depending on the clinical speciality, the number of publications and associated level of evidence (i.e. I or II) varied widely (Fig. 2). In cardiac surgery, the majority had an either retrospective or non-randomised prospective design, whereas several RCTs on this topic in vascular or plastic surgery have been published. The focus of studies for ciNPWT application was centred on specific surgical procedures involving high-risk patients with distinct comorbidities. Patients undergoing vascular surgery were by far more likely to present with multiple comorbidities as compared to patients undergoing primary arthroplasty or even a body lift procedure. It seemed as if a “high-risk collective” (e.g. for developing wound complications) experienced benefits from ciNPWT to a greater extent than a “low-risk collective”. This needs to consider the selection bias of all studies, since the application of a ciNPWT system would have required a huge number to treat in the case of “complication-free” or “less complication-prone” interventions. Consequently, none of the reviewed studies focused on this. The cited favourable results for ciNPWT application may, as a result, not necessarily be extrapolated to other surgical interventions. The reviewed reports also contained company-funded research (e.g. by provision of the analysed ciNPWT systems), and we cannot rule out potential conflicts of interest (COI) possibly affecting study results. In fact, 35.6% of studies (n = 21) disclosed COI or financial support (FS) related to their study, whilst none was disclosed in 52.5% (n = 31). No COI-/FS-related information was available in 11.9% (n = 7).

Conclusion and recommendations

Recommendations for indications of closed-incision negative-pressure wound therapy (ciNPWT) in the different surgical specialties, their level of evidence and outcomes are listed in Table 6. Given the focus of this review, patients with complication-prone interventions and/or presurgical risk factors can benefit from ciNPWT, whereas this treatment modality—also in the absence of statistical models to prove this—could not be scientifically proven to outbalance them. Surgical incisions with anticipated increased postoperative tension on wound edges and complicated wound regions most likely benefit from ciNPWT, since it “buys the wounds/incisions some time to stabilise” before stretching and tensile forces act again upon removal of the systems. In the light of the current evidence, we rather refrain from listing any surgical procedures suitable for ciNPWT, but encourage future application settings to be tried and tested by identifying suitable patients benefitting from this therapy. Each case should be planned individually, taking together all intrinsic and extrinsic risk factors prior to application of ciNPWT. Three components for future analysis (and current lack thereof) were revealed by this review: 1) non-inferiority study designs comparing traditional negative-pressurewound therapy (NPWT) systems vs. ciNPWT, 2) cost–benefit calculations for healthcare providers and system specific-outcome markers and 3) quality research (up to RCT level) with unique outcome measures like the Clavien–Dindo classification (complication grading based on intervention type for complications, and not on clinical assessment alone) and patient-reported outcome measures (PROMS; e.g. evaluating patient experience in relation to the use of the system) [84].
Table 6
Recommendations when to use closed-incision negative-pressure wound therapy (ciNPWT) with associated levels of evidence and overall significant results achieved
 
Indications
Level of evidence
Overall significant results
Orthopaedics and trauma
Revision surgery
Primary total joint arthroplasty (+ patient-related risk factors)
Level II, IV
Level I, II
55.6% (5/9)
General surgery
Surgery with postoperative tension on incision
Hernia repair
Surgery in potentially contaminated areas
Level I
Level I
Level I
90.0% (9/10)
Plastic surgery
Oncological procedures
Muscular flap harvest
Abdominoplasty
Surgery in potentially contaminated areas (e.g. inguinal region)
Breast reduction surgery
Surgery with subsequent impaired lymphatic drainage
Level III
Level II
Level III, IV
Level IV
Level II
Level II, IV
84.6% (11/13)
Cardiac surgery
Sternotomy
Level III, IV
33.3% (4/12)
Vascular surgery
Vessel harvest for vascular procedures
Surgery in contaminated areas (i.e. inguinal region)
Level I, II
Level I
86.7% (13/15)
We encourage future research to address these points.

Conflict of interest

M. Smolle, S.P. Nischwitz, M. Hutan, P. Trunk, D. Lumenta and G.A. Bernhardt declare that they have no competing interests.
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Metadaten
Titel
Closed-incision negative-pressure wound management in surgery—literature review and recommendations
verfasst von
Maria A. Smolle
Sebastian P. Nischwitz
Martin Hutan
Primoz Trunk
David Lumenta
Gerwin A. Bernhardt
Publikationsdatum
24.08.2020
Verlag
Springer Vienna
Erschienen in
European Surgery / Ausgabe 6/2020
Print ISSN: 1682-8631
Elektronische ISSN: 1682-4016
DOI
https://doi.org/10.1007/s10353-020-00657-w

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