Xenon and isoflurane improved biventricular function during right ventricular ischemia and reperfusion

Area of Science:

• Anesthesiology
• Cardiovascular Physiology
• Ischemic Heart Disease

Background:

• Anesthetics can offer cardioprotection but may impair myocardial contractility.
• Xenon lacks negative inotropic effects, suggesting potential hemodynamic benefits.
• Right ventricular ischemia presents a high risk of acute complications.

Purpose of the Study:

• To compare the effects of xenon and isoflurane on biventricular function during right ventricular ischemia and reperfusion.
• To evaluate xenon as a potentially superior anesthetic for maintaining global hemodynamics in this context.

Main Methods:

• A porcine model (n=36) was used to assess biventricular function via conductance catheter technique.
• Animals underwent 90 minutes of right ventricular ischemia followed by 120 minutes of reperfusion.
• Type B natriuretic peptide (BNP) gene expression was measured; a control group received barbiturate anesthesia.

Main Results:

• Cardiac output decreased significantly in unprotected animals during ischemia and reperfusion.
• Isoflurane improved left ventricular contractility and preload by reducing stiffness.
• Xenon increased right ventricular afterload, which was offset by enhanced contractility, with less pronounced diastolic effects.

Conclusions:

• Both xenon and isoflurane effectively prevented hemodynamic compromise during right ventricular ischemia-reperfusion.
• Equipotent hemodynamic protection was achieved through distinct inotropic and vasodilatory mechanisms.
• Both anesthetics inhibited upregulation of BNP mRNA in the remote left ventricle.