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Area of the pressure-strain loop during ejection as non-invasive index of left ventricular performance: a population study

Authors
  • Cauwenberghs, Nicholas1
  • Tabassian, Mahdi2
  • Thijs, Lutgarde1
  • Yang, Wen-Yi1
  • Wei, Fang-Fei1
  • Claus, Piet2
  • D’hooge, Jan2
  • Staessen, Jan A.1
  • Kuznetsova, Tatiana1
  • 1 University of Leuven, Research Unit Hypertension and Cardiovascular Epidemiology KU Leuven Department of Cardiovascular Sciences, Leuven, Belgium , Leuven (Belgium)
  • 2 University of Leuven, Division of Cardiovascular Imaging and Dynamics, Department of Cardiovascular Sciences, Leuven, Belgium , Leuven (Belgium)
Type
Published Article
Journal
Cardiovascular Ultrasound
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Aug 05, 2019
Volume
17
Issue
1
Identifiers
DOI: 10.1186/s12947-019-0166-y
Source
Springer Nature
Keywords
License
Green

Abstract

BackgroundPrevious studies highlighted the usefulness of integrating left ventricular (LV) deformation (strain) and hemodynamic parameters to quantify LV performance. In a population sample, we investigated the anthropometric and clinical determinants of a novel non-invasive index of LV systolic performance derived from simultaneous registration of LV strain and brachial pressure waveforms.MethodsThree hundred fifty-six randomly recruited subjects (44.7% women; mean age, 53.9 years; 47.5% hypertensive) underwent echocardiographic and arterial data acquisition. We constructed pressure-strain loops from simultaneously recorded two-dimensional LV strain curves and brachial pressure waveforms obtained by finger applanation tonometry. We defined the area of this pressure-strain loop during ejection as LV ejection work density (EWD). We reported effect sizes as EWD changes associated with a 1-SD increase in covariables.ResultsIn multivariable-adjusted analyses, higher EWD was associated with age, female sex and presence of hypertension (P ≤ 0.0084). In both men and women, EWD increased independently with augmentation pressure (effect size: + 59.1 Pa), central pulse pressure (+ 65.7 Pa) and pulse wave velocity (+ 44.8 Pa; P ≤ 0.0006). In men, EWD decreased with relative wall thickness (− 29.9 Pa) and increased with LV ejection fraction (+ 23.9 Pa; P ≤ 0.040). In women, EWD increased with left atrial (+ 76.2 Pa) and LV end-diastolic (+ 43.8 Pa) volume indexes and with E/e’ ratio (+ 51.1 Pa; P ≤ 0.026).ConclusionOlder age, female sex and hypertension were associated with higher EWD. Integration of the LV pressure-strain loop during ejection might be a useful tool to non-invasively evaluate sex-specific and interdependent effects of preload and afterload on LV myocardial performance.

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