What is the best perfusion temperature for coronary revascularization?

Area of Science:

• Cardiovascular Surgery
• Neurology
• Hematology

Background:

• A clinical trial investigated the impact of perfusate and myocardial preservation temperatures on patients undergoing coronary artery bypass surgery.
• The study aimed to evaluate neurologic function and hematologic data related to fibrinolytic potential.

Purpose of the Study:

• To determine the optimal temperature for myocardial preservation and systemic perfusion during cardiopulmonary bypass.
• To assess the effects of cold, tepid, and warm temperatures on neurologic outcomes and hematologic parameters.

Main Methods:

• 116 patients were evaluated using the Mathew scale for neurologic function across three temperature groups: cold (8-10°C), tepid (32°C), and warm (37°C).
• Systemic perfusate temperatures during cardiopulmonary bypass were 20°C (cold), 32°C (tepid), and 37°C (warm).
• Hematologic studies were conducted to measure fibrinolytic potential.

Main Results:

• The cold group experienced longer intubation and hospitalization, with a higher incidence of abnormal postoperative neurologic exams prompting CT scans.
• While neurologic deterioration occurred in all groups, the cold group showed a significantly higher rate of CT-scanned abnormalities and documented cerebrovascular accidents.
• The warm group exhibited significantly increased fibrinolytic potential, whereas the cold group showed more adverse neurologic sequelae.

Conclusions:

• Perfusion temperature significantly influences recovery following cardiopulmonary bypass.
• Cold temperatures are associated with more adverse neurologic outcomes, while warm temperatures enhance fibrinolytic activity.
• Tepid temperatures (32°C) represent the optimal choice for maximizing recovery after cardiopulmonary bypass.