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Transfusion after coronary artery bypass surgery: the impact of heparin-bonded circuits
1Carlson School of Management, University of Minnesota, Minneapolis 55455, USA. cmahoney@csom.umn.edu
Insights
Heparin-bonded circuits significantly reduce the need for packed red blood cell (PRBC) transfusions after coronary artery bypass grafting (CABG). This finding held true even after accounting for patient and surgical variables.
Area of Science:
- Cardiovascular Surgery
- Transfusion Medicine
- Biomaterials Science
Background:
- Coronary artery bypass grafting (CABG) frequently necessitates packed red blood cell (PRBC) transfusions.
- Patient demographics, comorbidities, and surgical variables influence transfusion requirements.
- Heparin-bonded circuits are designed to mitigate inflammatory responses during cardiopulmonary bypass.
Purpose of the Study:
- To ascertain the independent impact of heparin-bonded (Carmeda) circuits on PRBC transfusion needs post-CABG.
- To isolate the effect of heparin-bonded circuits from patient, procedural, and surgical factors.
Main Methods:
- A prospective, randomized trial involving 210 patients undergoing CABG.
- Patients were assigned to either non-bonded or heparin-bonded (Carmeda) circuits.
- Multivariate logistic and ordinary least squares regression analyses were employed.
Main Results:
- Heparin-bonded circuits were independently associated with a 50% reduced likelihood of PRBC transfusion.
- Predictors for transfusion included gender, pre-operative anticoagulants, and cross-clamp time.
- Heparin-bonded circuits also independently reduced the number of PRBC units transfused.
Conclusions:
- Heparin-bonded circuits significantly decrease PRBC transfusion requirements following CABG.
- The use of heparin-bonded circuits offers a 50% reduction in transfusion probability and 1.42 fewer PRBC units transfused, independent of other factors.
- This highlights the clinical benefit of heparin-bonded circuits in optimizing transfusion strategies for CABG patients.
Objective:
To identify the impact of heparin bonded (Carmeda) circuits on the need for transfusion of packed red blood cells (PRBC) after CABG independent of the influence of patient, procedural, and surgical experience variables.
Methods:
A prospective, randomized trial examined the impact of heparin-bonded circuits in 210 patients undergoing coronary artery bypass surgery at Medical Center of Delaware (Christiana Care Health Services). Patients were randomized to either non-bonded circuits or heparin-bonded (Carmeda) circuits. There were no significant differences in patient characteristics between the treatment and control group. A multivariate analysis was performed to identify the independent predictors of both the need for transfusion (logistic) and number of units of PRBC transfused (OLS).
Results:
The only significant (P < 0.05) independent predictors of need for transfusion were gender (odds ratio (OR) = 0.35 for males), use of anticoagulants prior to surgery (OR = 2.09), cross-clamp time (OR = 1.03 for each extra minute), and use of heparin-bonded circuits (OR = 0.50 for patients in the heparin-bonded; Carmeda, circuit group). The only significant independent predictors of number of PRBCs were anticoagulants prior to surgery, cross-clamp time, catheterization procedure on the same day, body surface area, and use of heparin-bonded circuits. Other patient demographic variables, comorbidities, and surgical variables were not significant independent predictors of the need for transfusion or the number of units transfused.
Conclusions:
Several factors influence the probability of transfusion that patients face following coronary artery bypass surgery. The probability of transfusion is 50% less and the number of PRBCs transfused are 1.42 units less when heparin-bonded (Carmeda) circuits are used, adjusted for patient demographics, comorbidities, or surgical variables.
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