cross-clamp time
Duration that the aorta is occluded during cardiac surgery, representing period of myocardial ischemia.
Full Definition
Cross-clamp time refers to the interval during which the ascending aorta is occluded by a cross-clamp during cardiac surgery, typically while the patient is on cardiopulmonary bypass. During this period, the heart receives no blood flow and undergoes controlled ischemia, allowing surgeons to operate on a motionless, bloodless field. Cardioplegia solution is administered to arrest the heart and provide myocardial protection. Cross-clamp time is a critical metric as prolonged ischemia increases the risk of myocardial dysfunction, arrhythmias, and other complications. Surgeons strive to minimize this time while ensuring adequate surgical repair.
Usage
Usage note: Critical parameter that affects patient outcomes. Do not confuse with total bypass time or operative time.
In Context
- "The cross-clamp time was 78 minutes for the complex valve repair." — Operative summary
- "Efforts were made to minimize cross-clamp time to preserve myocardial function." — Surgical technique paper