perfusion pressure
The driving pressure that determines blood flow through tissues during cardiopulmonary bypass or organ perfusion.
Full Definition
Perfusion pressure represents the pressure gradient that drives blood flow through tissues and organs, calculated as the difference between arterial inflow pressure and venous outflow pressure. During cardiac surgery with cardiopulmonary bypass, maintaining adequate perfusion pressure is crucial for organ protection, particularly for the brain, kidneys, and other vital organs. Target perfusion pressures are individualized based on patient factors including age, comorbidities, and baseline blood pressure. Inadequate perfusion pressure can lead to organ dysfunction, while excessive pressures may cause embolic complications or bleeding. Modern perfusion strategies often incorporate pulsatile flow and pressure monitoring to optimize tissue perfusion during complex procedures.
Usage
Usage note: Specify context (systemic, cerebral, renal) and target ranges when documenting perfusion management.
In Context
- "Perfusion pressure was maintained between 50-70 mmHg throughout the bypass period to ensure adequate organ protection." — Perfusion record
- "Decreased perfusion pressure during deep hypothermic circulatory arrest required adjustment of pump flow parameters." — Intraoperative management note