myocardial oxygen consumption
The amount of oxygen utilized by the heart muscle per unit time, typically measured in milliliters per 100 grams of tissue per minute.
Full Definition
Myocardial oxygen consumption (MVO₂) represents the metabolic demand of the heart muscle and is a critical parameter in cardiovascular anesthesiology. It is determined by heart rate, contractility, wall tension, and basal metabolism. During cardiac surgery, anesthesiologists must balance factors that increase MVO₂ (such as tachycardia and hypertension) against those that decrease oxygen supply. Understanding MVO₂ is essential for preventing perioperative myocardial ischemia and optimizing cardiac protection strategies.
Usage
Usage note: Distinguish clearly from oxygen delivery or supply when editing cardiovascular literature.
In Context
- "Beta-blockers were administered to reduce myocardial oxygen consumption during the high-risk procedure." — Anesthetic management plan
- "Elevated myocardial oxygen consumption was identified as a risk factor for postoperative complications." — Risk assessment documentation