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Dynamic Arterial Elastance as a Ventriculo-Arterial Coupling Index: An Experimental Animal Study
Manuel Ignacio Monge García1, Zhongping Jian2, Feras Hatib2
1Unidad de Cuidados Intensivos, Hospital Universitario SAS de Jerez, Jerez de la Frontera, Spain.
Frontiers in Physiology
|April 25, 2020
Summary
Dynamic arterial elastance (Eadyn) may help assess hemodynamic status in unstable patients. Higher Eadyn indicates greater left ventricular efficiency and lower ventricular-arterial coupling.
Area of Science:
- Cardiovascular Physiology
- Hemodynamics
- Critical Care Medicine
Background:
- Ventricular-arterial (VA) coupling optimizes cardiac function.
- Dynamic arterial elastance (Eadyn) is a potential non-invasive index of VA coupling.
Purpose of the Study:
- To validate Eadyn as an index of VA coupling and left ventricular (LV) efficiency.
- To assess the relationship between Eadyn, VA coupling, and LV efficiency under various hemodynamic conditions.
Main Methods:
- Utilized pressure-volume loops from conductance catheters and arterial pressure measurements in pigs.
- Manipulated afterload, preload, and contractility to create diverse hemodynamic states.
- Calculated end-systolic elastance (Ees), effective arterial elastance (Ea), VA coupling (Ea/Ees), LV efficiency, and Eadyn (PPV/SVV).
Main Results:
- Eadyn showed an inverse relationship with VA coupling (Ea/Ees).
- Eadyn demonstrated a direct relationship with LV efficiency.
- Increased Eadyn correlated with decreased VA coupling and increased LV efficiency.
Conclusions:
- Eadyn is a readily measurable parameter with potential clinical utility.
- Eadyn may serve as a valuable bedside tool for hemodynamic assessment in critically ill patients.
- Findings support Eadyn's role in reflecting the interplay between the left ventricle and arterial system.
