Desflurane, sevoflurane, and isoflurane decreased left ventricular-arterial coupling (Ees/Ea from 1.02 to 0.62 for desflurane) and mechanical efficiency at higher concentrations.
Do volatile anesthetics (desflurane, sevoflurane, and isoflurane) impair left ventricular-arterial coupling and mechanical efficiency in a canine model?
Volatile anesthetics preserve optimal left ventricular-arterial coupling and efficiency at low concentrations but cause significant mechanical mismatching at higher concentrations in a canine model.
Absolute Event Rate: 0.62% vs 1.02%
BACKGROUND: The effects of desflurane, sevoflurane, and isoflurane on left ventricular-arterial coupling and mechanical efficiency were examined and compared in acutely instrumented dogs. METHODS: Twenty-four open-chest, barbiturate-anesthetized dogs were instrumented for measurement of aortic and left ventricular (LV) pressure (micromanometer-tipped catheter), dP/dtmax, and LV volume (conductance catheter). Myocardial contractility was assessed with the end-systolic pressure-volume relation (Ees) and preload recruitable stroke work (Msw) generated from a series of LV pressure-volume diagrams. Left ventricular-arterial coupling and mechanical efficiency were determined by the ratio of Ees to effective arterial elastance (Ea; the ratio of end-systolic arterial pressure to stroke volume) and the ratio of stroke work (SW) to pressure-volume area (PVA), respectively. RESULTS: Desflurane, sevoflurane, and isoflurane reduced heart rate, mean arterial pressure, and left ventricular systolic pressure. All three anesthetics caused similar decreases in myocardial contractility and left ventricular afterload, as indicated by reductions in Ees, Msw, and dP/dtmax and Ea, respectively. Despite causing simultaneous declines in Ees and Ea, desflurane decreased Ees/Ea (1.02 +/- 0.16 during control to 0.62 +/- 0.14 at 1.2 minimum alveolar concentration) and SW/PVA (0.51 +/- 0.04 during control to 0.43 +/- 0.05 at 1.2 minimum alveolar concentration). Similar results were observed with sevoflurane and isoflurane. CONCLUSIONS: The present findings indicate that volatile anesthetics preserve optimum left ventricular-arterial coupling and efficiency at low anesthetic concentrations (< 0.9 minimum alveolar concentration); however, mechanical matching of energy transfer from the left ventricle to the arterial circulation degenerates at higher end-tidal concentrations. These detrimental alterations in left ventricular-arterial coupling produced by desflurane, sevoflurane, and isoflurane contribute to reductions in overall cardiac performance observed with these agents in vivo.
Hettrick et al. (Thu,) reported a other. Desflurane, sevoflurane, and isoflurane vs. Control (baseline) was evaluated on Left ventricular-arterial coupling (Ees/Ea) and mechanical efficiency (SW/PVA). Desflurane, sevoflurane, and isoflurane decreased left ventricular-arterial coupling (Ees/Ea from 1.02 to 0.62 for desflurane) and mechanical efficiency at higher concentrations.