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Erschienen in: Wiener klinische Wochenschrift 15-16/2015

Open Access 01.08.2015 | original article

High-frequency oscillatory ventilation combined with partial liquid ventilation in experimental lung injury: effects on lung cell apoptosis

verfasst von: Huimin Zuo, Dr. Linxiang Zeng, Guanghua Guo, Huihong Zeng

Erschienen in: Wiener klinische Wochenschrift | Ausgabe 15-16/2015

Summary

Objective

To investigate the effects of high-frequency oscillatory ventilation (HFOV) and partial liquid ventilation (PLV) on apoptosis of lung tissue induced by steam inhalation injury in rabbit.

Design

A prospective, randomized, controlled, multiple-group study.

Setting

An animal research laboratory centre in a university burns centre.

Subjects

New Zealand rabbits (n = 32; 2.25 ± 0.25 kg) of either sex.

Interventions

The animals were ventilated by HFOV with a mean airway pressure of 10 cm H2O, a frequency of 10 Hz, an amplitude of 20 cm H2O, an inspiratory:expiratory ratio of 1:1, and an FiO2 of 1.0. After the induction of acute lung injury (ALI) by steam inhalation, the animals were randomly divided into four groups: CMV, HFOV, CMV + PLV, HFOV + PLV group. Then they were ventilated for 4 h by CMV, HFOV, CMV + PLV and HFOV + PLV, respectively. After the experimental period, cell apoptosis and apoptosis indexes in the lung tissue were assessed with TUNEL FragELTM (Fragment End Labeling).

Results

Lung tissue apoptosis indexes in HFOV group and HFOV + PLV group were lower than that of in CMV group and CMV + PLV group; between-group comparison had significant difference (P < 0.01). HFOV + PLV group showed lowest apoptosis indexes.

Conclusion

HFOV combined with PLV can suppress lung tissue apoptosis induced by steam inhalation.

Introduction

Mechanical ventilation is usually necessary to achieve sufficient gas exchange in severe respiratory failure caused by adult respiratory distress syndrome (ARDS) or ALI [1]. Although conventional mode ventilation (CMV) or synchronized intermittent mandatory ventilation with lung protective strategy reduces the complication and improves outcome, however it may still cause mechanical injury to the lungs [24]. High-frequency oscillatory ventilation (HFOV), a technique of rapid ventilation with use of very small tidal volume has a potential of reducing ventilator associated lung injuries [56], particularly when started early, before significant lung damage has been caused by tidal ventilation [7].
HFOV addresses all of these mechanisms of injury while maintaining adequate gas exchange, and may thereby serve as the optimal mode of ventilation in patients with ARDS [8]. Meta-analysis shows that HFOV can reduce mortality of adult ARDS, reduce intractable hypoxemia, hypotension, barotrauma and incidence of hypercapnia [9]. In paediatric patients with acute respiratory failure, failing conventional ventilation (CV), HFOV can improve hypercapnia and gas exchange in a rapid and sustained fashion [1011]. It is a safe option for the treatment of ARDS and severe small airway diseases [12].
Partial liquid ventilation (PLV) has been shown to markedly improve oxygenation through recruitment of a collapsed alveolar space and reduce histologic evidence of injury in a number of lung injured models [13]. In addition to improving lung function in animal models of ALI, PLV also attenuates the inflammatory response and reduces pulmonary neutrophil accumulation. This phenomenon occurs in numerous models of ALI [14]. HFOV and PLV developed as a rescue and lung-protective ventilation strategy have become major concerns in recent years. HFOV represents an ‘open lung’ approach to mechanical ventilation that uses tidal volumes less than physiologic dead space and sustained mean airway pressures to maintain lung recruitment. The appropriate mean airway pressure can improve the functional residual capacity, increase the oxygen diffusion area and improve oxygenation state. During HFOV, tidal volume (Vt) and associated swings in alveolar pressure are very small [1516]. It can improve arterial oxygenation, reduce ventilator-associated lung injury. HFOV achieves oxygenation and ventilation by oscillating the lung around a constant mean airway pressure, with small tidal volumes at a high frequency. Patients with ALI have a high mortality and often require the assistance of mechanical ventilation, which may further aggravate the ALI owing to the risk of barotraumas, polytrauma and bio traumas. Severe steam inhalation injury can cause all mild, moderate and severe type of ARDS; according to the Berlin Definition, is also associated with increased mortality [17].
During the mechanical ventilation period, pulmonary endothelial cells are simultaneously subjected to mechanical stretch and fluid shear because of its function, position and special structure. Mechanical ventilation and pulmonary stretch directly change the configuration of the cell, affect the function of endothelial cells, also make the fluid shearing stress cyclically change with the rhythmic mechanical ventilation, which further influence the endothelial cells [1821].
The pathogenesis of inhalation injury has not been completely elucidated; studies have shown that cell apoptosis is involved in the pathological process following inhalation injury [22]. For further observations of lung cell apoptosis to inhalation injury, the change of apoptosis after mechanical ventilation therapy and its relationship with apoptosis will help to reveal the essence of inhalation injury.
In our study, we use four modes of ventilation treatment in the rabbit model of steam inhalation injury and acute respiratory failure to observe the changes in ventilation of apoptosis lung tissue and to investigate the treatment mechanism of the high-frequency oscillation ventilation combined PLV on inhalation injury.

Materials and methods

All the protocols used in this study were in accordance with the guidelines for the care and uses of laboratory animals published by the National Institute of Health in China and were approved by the Committee of Jiangxi Science Council, Nanchang, China.

Animal preparation and ventilation treatment

We utilized 32 healthy adult New Zealand white rabbits (2.25 ± 0.25 kg) of either sex, adopted the method of the Chinese People’s Liberation Army Third Military Medical University [23], to reproduce the rabbits model of steam inhalation injury. When the arterial blood oxygen partial pressure was less than 60 mmHg, the model is completed. Then the rabbits were randomly divided into CMV (n = 8), treated with CMV only; CMV + PLV (n = 8), treated with a combined therapy of CMV + PLV; HFOV (n = 8), treated with CMV only; HFOV + PLV treated with a combined therapy of HFOV + PLV. The CMV and CMV + PLV groups were conducted using CMV with VT 10 ml/kg, 30 breathes/min, inspiratory oxygen fraction 100 %, inspiratory time 1 s and positive end-expiratory pressure (PEEP) 0 cm H2O. The HFOV and HFOV + PLV groups were switched to HFOV with mean airway pressure set at 12 cm H2O, an FiO2 of 1.0, a frequency of 10 Hz, an amplitude of 20 cm H2O, inspiratory to expiratory ratio of 1:1.
Throughout the experiment, heart rate (HR) and mean blood pressure (MBP) was monitored and recorded, and femoral artery blood was withdrawn every 0.5, 1.5, 2.5 and 3.5 h for arterial blood gas analysis during the mechanical ventilation treatment period.
With its characteristics of high density, perfluorocarbons (PFCs) can be deposited on the prolapse part of lung because of the effect of gravity. A certain volume of liquid can make the atelectatic alveoli to be opened again; its action is similar to “liquid” PEEP. PFC (perfluorodecalin; F2 Chemical’s Ltd., Lea Lane, LeDifferent positional Town, Preston, Lancashine, PR4 OPZ, UK) is injected two times via an endotracheal tube at different body positions of mechanical ventilation in CMV + PLV and HFOV + PLV groups, initially 1 ml/kg, and 30 min later, additional 0.5 ml/kg at a different body position—a total of 3 ml/kg implemented as PLV.

Apoptosis steps monitoring by TUNEL assay

Phlebotomize after 4-h ventilation treatment in each experimental group, apoptotic cells in pulmonary tissue from all groups were detected by the FragELTM (Fragment-end-labeling technique). The terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling (TUNEL) assay was performed using an In Situ Apoptosis Detection kit according to the manufacturer’s instructions (Promega, Michigan, USA). Briefly, paraffin-embedded sections were deparaffinized with xylene and dehydrated through graded alcohols. After washing with PBS, the slides were permeated with 0.1 % Triton X-100 in 0.1 % sodium citrate for 2 min once. And endogenous peroxidase activity was quenched by incubation of the sections for 10 min with 3 % hydrogen peroxide in PBS. Slides were placed in equilibration buffer and then placed in working-strength TdT enzyme, followed by working-strength stop/wash buffer. After two drops of anti-digoxigenin-biotin were applied to the slides, diaminobenzidine was used to detect peroxidase and then washed with deionized water. Counterstaining of nuclei was performed with Immunomaster’s Hematoxylin by incubating the sections at room temperature for 10 min. Reactive nuclei that were brownish tinge served as positive controls. Slides without being placed in TdT served as negative controls. The assessments of the number of apoptotic cells by TUNEL assay were performed using captured high-quality images obtained with an image analysis system (HMIAS–2000; Video Technology Co., Ltd, Wuhan, China). The apoptosis index was calculated as: the number of apoptotic cells/total cells × 100 %, the results are expressed with mean ± SEM.

Statistical analysis

The indicators are expressed as the mean ± standard error of the mean, all data are performed by SPSS12.0 statistics software analysis, Comparisons of each group were made using a paired t-test, comparison among the groups were evaluated by analysis of variance. Difference was defined for values of P < 0.05. Difference was significantly defined for values of P < 0.01.

Result

PaO2, PaCO2, HR and MBP significantly change in these animals immediately after four different ventilation treatments.
Changes in arterial blood gases during the 3.5 h observation period are presented in Table 1. PaO2 displayed a trend of improvement after half an hour ventilation treatment. There were significant changes compared with other periods (P < 0.01).
Table 1
Changes in arterial PaO2 over time in the various treatment groups (mmHg \(\overline X \) ± s, n = 8)
Group
0 h
0.5 h
1.5 h
2.5 h
3.5 h
CMVa
58 ± 4
209 ± 50
175 ± 47
187 ± 53
179 ± 55
CMV + PLVb
55 ± 9
213 ± 44
238 ± 42
243 ± 49
186 ± 50
HFOVc
576 ± 7
209 ± 38
239 ± 36
272 ± 41
215 ± 38
HFOV + PLVd
55 ± 7
214 ± 51
269 ± 45
291 ± 39
277 ± 42
CMV conventional mode ventilation, HFOV high-frequency oscillatory ventilation alone, HFOV + PLV combined therapy of HFOV + PLV, PLV partial liquid ventilation
0.5 h time point between group analysis: P > 0.05
1.5 h time point between group a and b, a and c analysis: P < 0.05, a and d analysis: P < 0.01; between other groups analysis: P > 0.05
2.5 h time point between group a and b analysis: P < 0.05, a and c, a and d analysis: P < 0.01, b and d analysis: P < 0.01, c and b, c and d analysis: P > 0.05
3.5 h time point between d and other groups analysis: P < 0.01 between other groups analysis: P > 0.05
Data are expressed as the mean ± SEM
Table 1 showed PaO2 was at a higher level during the whole experiment, after 0.5-h of treatment, PaO2 began to rise, all groups had their best PaO2 at the 2.5 h time point. HFOV showed better results with PaO2 over time versus the CMV group; CMV + PLV group also had the PaO2 increase after 0.5-h treatment. Both the HFOV and the CMV + PLV groups showed better results with PaO2 over time versus the CMV group. HFOV + PLV showed significantly better results with PaO2 compared with the other three groups, after 3.5-h treatment, HFOV + PLV HFOV had better results of PaO2. The values of PaO2 with HFOV + PLV group were significantly higher than the CMV + PLV group after 2.5 and 3.5 h treatment.
Table 2 showed the changes in HR (MBP) during the 3.5-h observation period. After four groups of different ventilation mode treatment, the HR remained fairly stable over time, changes within the group and between groups have no statistical significance (P > 0.05).
Table 2
Changes in heart rate (HR) in various treatment groups (\(\overline X \) ± s, n = 8)
Group
0 h
0.5 h
1.5 h
2.5 h
3.5 h
CMVa
286 ± 18
286 ± 13
281 ± 14
280 ± 14
284 ± 16
CMV + PLVb
281 ± 13
278. ± 16
282 ± 13
281 ± 17
285 ± 16
HFOVc
286 ± 20
284 ± 17
283 ± 15
286 ± 18
283 ± 15
HFOV + PLVd
286 ± 18
287 ± 21
283 ± 16
282 ± 17
286 ± 14
CMV conventional mode ventilation, HFOV high-frequency oscillatory ventilation alone, HFOV + PLV combined therapy of HFOV + PLV, PLV partial liquid ventilation
Within-group analysis: P > 0.05 vs post-injury. Between-group analysis: P > 0.05
Data are expressed as the mean ± SEM
However, the values of PaCO2 in four groups have increased after induction of ALI, but fluctuated with 30 ~ 42 mmHg during the ventilatory treatment, there are no significant changes within the group and between groups. The changes of MBP during the 3.5-h observation period within the group and between groups have no statistical significance (P > 0.05) after four groups of different ventilation mode treatment.
Table 3 showed lung tissue apoptosis index of HFOV + PLV group is lowest, as 13.52 %, CMV group is highest, as 39.57 %. HFOV and HFOV + PLV group were significantly lowered than of the CMV and CMV + PLV group, respectively comparison between groups had significant difference (P < 0.01). And CMV + PLV group is lower than CMV group without PLV, compare between groups had significant difference (P < 0.01); HFOV + PLV group is lower than HFOV group, but there was no significant difference (P > 0.05).
Table 3
Apoptosis index in lung tissue (\(\overline X \) ± s, n = 8)
Group
Apoptosis indexes (%)
CMV
39.57 ± 6.36
CMV + PLV
25.83 ± 7.15
HFOV
21.64 ± 3.80
HFOV + PLV
13.52 ± 5.33
CMV conventional mode ventilation, HFOV high-frequency oscillatory ventilation alone, HFOV + PLV combined therapy of HFOV + PLV, PLV partial liquid ventilation
Apoptosis indexes: Between HFOV and CMV + PLV, HFOV and HFOV + PLV analysis (P > 0.05), Between other groups analysis (P < 0.01)
TUNEL-positive staining nuclei emerge tan; karyopyknosis emerge rounded (Fig. 1). Some irregular chromatin is gathered together and distributed on the brink of nucleus, which conforms to the morphology of apoptotic cells; apoptotic body can be found in several cells.

Discussion and conclusions

Apoptosis is a programmed cell death; cell apoptosis is closely associated with inhalation injury [24]. Apoptosis participates in inhalation injury, and the pathological process of ventilator-associated lung injury [25], inhibiting the excessive apoptosis of lung tissue cells can reduce lung injury; it may be a new way of lung injury prevention. Steam inhalation injury can accelerate lung tissue apoptosis; its mechanism is related to the following factors: (1) the tissue is ischaemic and hypoxic; (2) inflammatory mediators, cytokines, oxygen, free radicals, reactive oxygen species, metabolic intermediate, etc., directly or indirectly, interfere with apoptosis control gene expression, and promote cell apoptosis; (3) thermodynamic effects of the steam. Mechanical ventilation can improve alveolar ventilation function, which is an important means of treatment of severe burns complicated by inhalation injury, but mechanical ventilation can cause excessive tension in atelectatic lung alveolar tissue; after repeatedly being closed and opened, the mechanical ventilation and shearing damage induced the release of inflammatory mediators, and also can accelerate vascular endothelial cells and alveolar epithelial cell apoptosis [26]. Hammerschmidt experiment confirmed that excessive tension can directly cause alveolar epithelial cell apoptosis [27]. While the conclusion is the opposite in Mr. Imai and Fisher reports: Despite a high degree of invasive mechanical ventilation, the number of apoptosis is reduced [28]. The exact mechanism of effect of mechanical ventilation on the apoptosis will be further investigated in the future.
To understand different mechanical ventilation treatment with rabbit induced by steam inhalation injury, the mechanism and function pathway of effect on apoptosis of lung tissue, we adopt TUNEL technique to monitor lung tissue apoptosis. The ventilation experiment HFOV + PLV treatment group apoptosis index is the lowest, CMV group apoptosis index is the highest. Apoptosis index of HFOV group and HFOV + PLV group is significantly less than that of CMV and CMV + PLV group, which shows that high-frequency oscillation ventilation can reduce lung tissue apoptosis in rabbit induced by steam inhalation injury, which is due to the characteristics of HFOV, high-frequency, low tidal volume, and a constant, less variable airway pressure can alleviate mechanical stimulation of the tension stress and shearing stress of lung tissue, avoid the alveolar epithelial cells stretching by excessive force, therefore, it reduces the occurrence of apoptosis. In this experiment, cell apoptosis of CMV + PLV group and HFOV + PLV is less than CMV group and HFOV group, showing that PLV can decrease the rate of lung tissue apoptosis, the mechanism may be due to the following ways: (1) the PFC can improve lung of respiratory function, correct the cell hypoxia by reducing alveolar surface tension and dead space, improving V/Q matching; (2) the fluorine carbon can reduce the concentration of adhesion molecules and mRNA expression in the lungs, thus reducing the neutrophils’ adhesion to vascular endothelial cell and detention in the lungs, suppress the inflammatory reaction of lung tissue, thus reduce the inflammation mediums; stability of cell membrane and suppress lung inflammatory mediators and cytokines release; (3) the fluorine carbon may regulate gene expression by influencing apoptosis, reduce the apoptosis of lung tissue cells.
However, our results lacked tissue cell types and had a major problem with ventilator settings using high tidal volumes without PEEP as controls (CMV and CMV + PLV) for HFOV. There are two reasons: First, depending on the characteristics of high density, PFCs can be deposited on the prolapse of part of lung because of the effect of gravity. A certain volume of liquid can make the atelectatic alveolar to be opened again; its function is similar to “liquid” PEEP. To exclude the intervention of PEEP and indicate the effect of “liquid” PEEP, we performed without PEEP. Second, meta-analysis evidence indicates that high levels of PEEP, as compared with low levels, did not reduce mortality before hospital discharge. The data also show that high levels of PEEP produced no significant difference in the risk of barotrauma [29]. But this is not in accordance with actual clinical recommendations of a lung protective ventilation strategy for ARDS patients. Patients were encouraged to use pressure-controlled ventilation at 6–8 ml per kilogram of ideal body weight and to use the combinations of PEEP and FiO2 values that were used in the Acute Respiratory Distress Syndrome Network study in the CV strategy [30]. We recommend that this mode of ventilation not to be used for routine care.
Regardless of its limitations, this study is interesting and suggests that lung tissue is injured after inhalation steam and that HFOV with PLV strategy reduces lung cells’ damage than CV although this setting is not in accordance with international recommendations for ventilation of ARDS patients. Further, more research analysis is needed and must be broadened to study the possible mechanisms of HFOV to minimize injury.
We obtained positive results using a combination therapy of HFOV and PLV to treat experimental lung injury induced by steam inhalation compared with conventional mechanical ventilation. This experiment demonstrates HFOV and PLV reduce the lung tissue apoptosis, and have the synergy with each other.
During 2013, two large randomized controlled trials comparing HFOV with a conventional lung-protective ventilation were published—the Oscillation for Acute Respiratory Distress Syndrome Treated Early (OSCILLATE) and the Oscillation in ARDS (OSCAR) trials. These trials suggested no benefit or even harm with HFOV in adults with early moderate-to-severe ARDS [31, 32]. There might be a treatment benefit of HFOV over CV in patients with ARDS and higher baseline the oxygenation index [33]. A study shows liquid ventilation using PFCs provide gas exchange in the lungs, potentially useful adjunct in the management of severe respiratory failure [34].
Many animal studies indicated that PLV can alleviate the histological damage of ALI induced by meconium aspiration (MAS) and increased survival chance and therefore PLV would be a useful treatment for MAS [35]. And PLV with PFCs may protect the lung from acute pulmonary inflammation more effectively than CV or HFOV does [36].
Future studies on combined therapy with HFOV + PLV will need to identify those patients who might benefit most from HFOV and to determine the best oscillator settings. Both goals require an improved capability of monitoring recruitment and over distension, and oscillatory volumes. Moreover, future directions with potential new technical advances and the use of new bedside monitoring techniques needed to be addressed.
Conflict of interest
The authors report that this study did not receive any financial and personal relationships with other people or organizations that could inappropriately influence our work. There are no potential conflicts of interest.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://​creativecommons.​org/​licenses/​by/​4.​0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

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Metadaten
Titel
High-frequency oscillatory ventilation combined with partial liquid ventilation in experimental lung injury: effects on lung cell apoptosis
verfasst von
Huimin Zuo
Dr. Linxiang Zeng
Guanghua Guo
Huihong Zeng
Publikationsdatum
01.08.2015
Verlag
Springer Vienna
Erschienen in
Wiener klinische Wochenschrift / Ausgabe 15-16/2015
Print ISSN: 0043-5325
Elektronische ISSN: 1613-7671
DOI
https://doi.org/10.1007/s00508-015-0727-5

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