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A combined approach for improving cardiopulmonary bypass in coronary artery surgery: a pilot study
Christophe Baufreton1, Jean Louis de Brux, Patrice Binuani
1Service de Chirurgie Cardio-Vasculaire et Thoracique, CHU d'Angers, Angers Cedex, France. chBaufreton@chu-angers.fr
Insights
This pilot study shows a novel cardiopulmonary bypass (CPB) method with reduced anticoagulation improves patient outcomes in coronary artery bypass surgery, decreasing myocardial injury and need for inotropic support.
Area of Science:
- Cardiovascular Surgery
- Cardiopulmonary Bypass
- Anesthesiology
Background:
- Assessing the feasibility and clinical impact of cardiopulmonary bypass (CPB) with reduced anticoagulation.
- Pilot study evaluating a novel approach to CPB in coronary artery bypass grafting (CABG).
Purpose of the Study:
- To evaluate a combined approach of CPB with reduced anticoagulation.
- To assess the clinical impact and feasibility of modified CPB techniques.
Main Methods:
- Retrospective analysis of 45 patients undergoing coronary artery bypass.
- Comparison between standard CPB with full anticoagulation and a closed, heparin-coated CPB with low anticoagulation, precise titration, controlled suction, and retrograde autologous prime.
- Activated clotting time (ACT) > 450 s for standard CPB vs. ACT > 250 s for modified CPB.
Main Results:
- Reduced heparin (41%) and protamine (56%) use in the modified CPB group.
- Lower operative hematocrit decrease and similar postoperative blood loss in the modified CPB group.
- Decreased need for postoperative inotropic support (36.4% vs. 65.2%) and protection against myocardial cellular injury in the modified CPB group.
Conclusions:
- The combined approach of improved CPB attenuated the negative postoperative outcomes in coronary artery surgery.
- Modified CPB with reduced anticoagulation demonstrates potential for improved patient recovery and reduced complications.
- This approach shows promise for enhancing CPB strategies in cardiovascular procedures.
Background:
This is a pilot study carried out to assess the feasibility and the clinical impact of a combined approach of cardiopulmonary bypass (CPB) with reduced anti-coagulation.
Methods:
We used a retrospective, non-randomized analysis of 45 consecutive patients undergoing coronary artery bypass using standard CPB with full anticoagulation (activated clotting time, ACT, > 450 s) (Group 1; n = 23) or closed, heparin-coated CPB with low anticoagulation (ACT>250 s), precise heparin and protamine titration, controlled suction, and retrograde autologous prime (Group 2; n = 22).
Results:
Patients were similar except for a higher incidence of three-vessel disease in Group 2 (77.3% versus 47.8%; p < 0.03). Heparin was reduced by 41% in Group 2 and protamine by 56% (p < 0.0001). Total postoperative blood loss was similar between Groups 1 and 2 (429 +/- 149 versus 435+/-168 ml, respectively). However, the operative hematocrit decrease was lower in Group 2 (-1.6 +/- 7.5% versus -6.9 +/- 4.8%; p = 0.007), although hemodilution was similar, as reflected by the blood protein level. The need for postoperative inotropic support was less frequent in Group 2 (36.4% versus 65.2%; p = 0.05). Within the subgroup of patients weaned from CPB without requiring inotropic support (n = 35), the cardiac index dropped significantly in Group 1 (p = 0.003) 6 h after the start of CPB, whereas it remained stable in Group 2 (p = 0.92). Using multivariate analyses, Group 2 was found to be more protected than Group 1 against myocardial cellular injury (p = 0.046) and need for postoperative inotropic support (p = 0.014).
Conclusion:
The pejorative postoperative outcome in coronary artery surgery was attenuated through a combined approach aimed at improving CPB.