hypothermic circulatory arrest
A surgical technique involving profound cooling and complete cessation of circulation to enable complex cardiac or aortic procedures.
Full Definition
Hypothermic circulatory arrest (HCA) is an advanced cardiac surgical technique used for complex procedures requiring a bloodless operative field, particularly aortic arch surgery and certain congenital heart repairs. The process involves gradually cooling the patient to temperatures typically between 18-20°C using cardiopulmonary bypass, then completely stopping circulation while maintaining the low temperature. This profound hypothermia dramatically reduces cellular metabolic demands, allowing tissues to tolerate periods without blood flow that would otherwise cause irreversible damage. The technique provides surgeons with optimal visualization and working conditions for intricate repairs, though it requires careful temperature management, monitoring of coagulation status, and awareness of potential complications including bleeding and neurological injury.
Usage
Usage note: HCA or DHCA are acceptable abbreviations; always specify arrest time and target temperature.
In Context
- "Hypothermic circulatory arrest was employed for 28 minutes during the aortic arch reconstruction." — operative report
- "The patient was successfully rewarmed following hypothermic circulatory arrest with no neurological deficits." — surgical summary