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Erschienen in: Wiener klinische Wochenschrift 5/2015

01.12.2015 | original article

Non-invasive measuring of the acceleration of contraction of the left ventricle with the Doppler echocardiography

verfasst von: MD Igor Krajnc, MD, PhD Prof. Andreja Sinkovič, MD, PhD Assist. Prof. Franjo Naji, MD, PhD Prof. Ivan Krajnc

Erschienen in: Wiener klinische Wochenschrift | Sonderheft 5/2015

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Summary

Background

Echocardiographically measured ejection fraction (EF) of the left ventricle (LV) is the most useful standard of the LV systolic function. Its limitations are poor delineation of the LV endocardium, pronounced regional disorders of contractility, dyssynchrony of the LV and in particular significant mitral regurgitation. The aim of this research is to evaluate the advantage of Doppler indices of left ventricular function such as index of acceleration of contraction of the LV (AccLV) over EF in patients with heart failure.

Methods

We performed a prospective observational study. We included 45 patients with known chronic heart failure and 76 healthy subjects. We performed standard echocardiographic measurements. AccLV was calculated by the following formula: AccLV = Vmax LVOT/dt × EDV [cm/s2 ml]. Vmax LVOT represents the maximum velocity during ejection in the left ventricular outflow tract (LVOT), dt stands for the interval from the beginning of the LV contraction to the achieved Vmax LVOT, EDV represents end-diastolic volume of the LV.

Results

Between patients and healthy subjects we observed statistically significant differences in mean EF values (65.4 ± 6.7 % vs. 38.6 ± 18.0 %; p < 0.001) and of AccLV (12.1 ± 2.88 cm/s2ml vs. 4.4 ± 2.1 cm/s2ml; p < 0.001). Receiver operating characteristic (ROC) curve showed higher area under the curve values for AccLV in comparison to EF (0.996 vs. 0.897). In the patient group we observed more important correlation between AccLV index and the New York Heart Association (NYHA) functional classes (r = − 0.657; p < 0.001), than between EF and the NYHA classes (r = − 0.539; p < 0.001).

Conclusions

We could distinguish with higher accuracy between healthy subjects and patients with heart failure LV by calculated AccLV in comparison to EF. AccLV values correlated with NYHA functional classes in patients with heart failure better than EF values.
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Metadaten
Titel
Non-invasive measuring of the acceleration of contraction of the left ventricle with the Doppler echocardiography
verfasst von
MD Igor Krajnc
MD, PhD Prof. Andreja Sinkovič
MD, PhD Assist. Prof. Franjo Naji
MD, PhD Prof. Ivan Krajnc
Publikationsdatum
01.12.2015
Verlag
Springer Vienna
Erschienen in
Wiener klinische Wochenschrift / Ausgabe Sonderheft 5/2015
Print ISSN: 0043-5325
Elektronische ISSN: 1613-7671
DOI
https://doi.org/10.1007/s00508-015-0916-2