Dextran- Versus Crystalloid-Based Prime in Cardiac Surgery: A Prospective Randomized Pilot Study

Area of Science:

• Cardiovascular Surgery
• Anesthesiology
• Critical Care Medicine

Background:

• The optimal priming fluid for cardiopulmonary bypass (CPB) remains a subject of ongoing debate in cardiac surgery.
• Standard crystalloid primes may lead to hemodilution and reduced oncotic pressure during CPB.

Purpose of the Study:

• To compare a novel hyperoncotic priming solution containing dextran 40 with a standard crystalloid prime for CPB.
• To evaluate the impact of the priming solution on colloid oncotic pressure and other clinical parameters.

Main Methods:

• A double-blind, randomized study included 80 cardiac surgery patients.
• Patients received either a dextran-based or a crystalloid (Ringer's acetate and mannitol) prime.
• Primary endpoint was serum colloid oncotic pressure during CPB; secondary endpoints included fluid balance, bleeding, and organ function markers.

Main Results:

• The dextran-based prime group demonstrated significantly higher colloid oncotic pressure during and after CPB.
• Patients receiving the dextran prime required less intravenous fluid during CPB and had a less positive fluid balance post-surgery.
• Lower plasma-free hemoglobin was observed in the dextran group, indicating reduced hemolysis, with no significant differences in bleeding or organ injury.

Conclusions:

• A hyperoncotic dextran-based priming solution effectively preserves intraoperative colloid oncotic pressure compared to crystalloid primes.
• Further large-scale studies are warranted to confirm the clinical benefits of hyperoncotic priming solutions in cardiac surgery.