retrograde autologous priming
Also written as: RAP — Retrograde Autologous Priming
A technique to reduce the cardiopulmonary bypass circuit prime volume by displacing crystalloid solution with patient's blood.
Full Definition
Retrograde autologous priming (RAP) is a blood conservation technique performed before initiating cardiopulmonary bypass. The process involves connecting the patient to the bypass circuit and using venous drainage to displace crystalloid prime with the patient's own blood, which is then returned to reduce hemodilution. This technique can reduce prime volume by 500-1500 mL, helping maintain higher hematocrit levels during bypass. RAP is particularly beneficial in pediatric patients, small adults, and patients who decline blood transfusion for religious reasons.
Usage
Usage note: Requires coordination between anesthesia and perfusion teams for safe execution.
In Context
- "RAP was performed to minimize hemodilution in this Jehovah's Witness patient." — Perfusion record
- "Retrograde autologous priming reduced the circuit volume by 800 mL." — Operative report