hypothermic circulatory arrest
Surgical technique involving deep hypothermia and complete cessation of circulation to protect organs during complex procedures.
Full Definition
Hypothermic circulatory arrest (HCA) is an advanced perfusion technique used in complex cardiac and aortic surgery that involves cooling the patient to profound hypothermia (typically 15-20°C) and completely stopping circulation for a defined period. This technique provides optimal surgical exposure for procedures on the aortic arch, complex congenital repairs, or removal of cardiac tumors while protecting the brain and other vital organs from ischemic injury. The duration of safe circulatory arrest depends on the degree of hypothermia achieved, with typical safe periods ranging from 30-45 minutes. HCA requires specialized perfusion management and careful rewarming protocols.
Usage
Usage note: Often abbreviated as HCA or DHCA. Specify arrest time and minimum temperature achieved.
In Context
- "Hypothermic circulatory arrest was employed for aortic arch replacement with a arrest time of 35 minutes." — Operative report
- "The patient tolerated hypothermic circulatory arrest well with no neurological deficits postoperatively." — Surgical summary