cross-clamp time
The duration during which the aorta is clamped, representing the period of myocardial ischemia during surgery.
Full Definition
Cross-clamp time refers to the total duration that the aortic cross-clamp is applied during cardiac surgery, effectively measuring the period of induced myocardial ischemia. During this time, blood flow to the coronary arteries is interrupted, and the heart is protected by cardioplegia. Cross-clamp time is a critical parameter that directly correlates with perioperative morbidity and mortality, with longer times associated with increased risk of myocardial injury, low cardiac output syndrome, and need for inotropic support. Surgeons strive to minimize cross-clamp time while ensuring technical precision. Times exceeding 120 minutes are generally associated with increased complications.
Usage
Usage note: Always specify as aortic cross-clamp time when context is unclear; express in minutes
In Context
- "The aortic cross-clamp time was 78 minutes for the double valve replacement procedure." — operative report
- "Efforts were made to minimize cross-clamp time to reduce myocardial ischemia." — operative report