Improved myocardial performance following high 2-3 diphosphoglycerate red cell transfusions

Area of Science:

• Cardiology
• Transfusion Medicine
• Biochemistry

Background:

• Coronary artery bypass surgery (CABS) patients often experience impaired cardiac function post-operation.
• Oxygen delivery can be limited in patients with coronary artery disease, particularly after cardiopulmonary bypass.
• Red blood cell 2,3-diphosphoglycerate (2-3 DPG) levels influence hemoglobin's oxygen affinity.

Purpose of the Study:

• To investigate the impact of 2-3 DPG-enriched red blood cells on myocardial performance in CABS patients.
• To assess whether increasing 2-3 DPG levels can improve oxygen delivery and cardiac function post-cardiopulmonary bypass.

Main Methods:

• A randomized study involving 22 CABS patients divided into two groups.
• Control group received standard CPD-stored or fresh blood (70% normal 2-3 DPG).
• Experimental group received 2-3 DPG-enriched red blood cells (150% normal 2-3 DPG).

Main Results:

• Patients receiving high 2-3 DPG red cells showed a significant increase in cardiac index (2.95 vs. 2.18 L/min, p<0.001) upon volume loading.
• High 2-3 DPG group exhibited increased oxygen consumption, in vivo P50, red cell 2-3 DPG, and arterial-venous oxygen content difference.
• Improved oxygen delivery was achieved without compromising mixed venous oxygen tension.

Conclusions:

• Myocardial performance in CABS patients with coronary artery disease is partly limited by oxygen availability.
• Biochemically altering red blood cells to decrease hemoglobin-oxygen affinity safely enhances myocardial performance.
• 2-3 DPG-enriched red blood cell transfusion is a promising strategy for improving cardiac function in specific patient populations.