myocardial oxygen consumption
Also written as: MVO2 — Myocardial Oxygen Consumption
The rate at which the myocardium consumes oxygen, primarily determined by heart rate, contractility, and wall tension.
Full Definition
Myocardial oxygen consumption (MVO2) represents the metabolic oxygen demand of cardiac muscle, typically measured in milliliters per 100 grams of myocardium per minute. The primary determinants include heart rate, myocardial contractility, and ventricular wall tension (preload and afterload). During cardiac anesthesia, minimizing MVO2 is crucial for myocardial protection, especially during periods of reduced coronary perfusion. Anesthetic agents, beta-blockers, and hemodynamic management strategies all influence myocardial oxygen demand and must be carefully titrated to prevent supply-demand mismatch.
Usage
Usage note: Hyphenate when used as adjective: 'myocardial oxygen-consumption index.'
In Context
- "Propofol administration reduced myocardial oxygen consumption while maintaining adequate perfusion pressure." — Anesthesia record
- "The patient's elevated MVO2 secondary to hypertension required aggressive afterload reduction." — ICU consultation note