A Combined Approach for Improving Cardiopulmonary Bypass in Coronary Artery Surgery: A Pilot Ptudy
Abstract:
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.
Baufreton C.Ä1Å; de Brux J.L.Ä1Å; Binuani P.Ä1Å; Corbeau J-J.Ä1Å; Subayi J.B.Ä1Å; Daniel J.C.Ä1Å; Treanor P.Ä2Å
Ä1Å Service de Chirurgie Cardio-Vasculaire et Thoracique, CHU d’Angers, Angers Cédex, France
Ä2Å Department of Cardiac Surgery, VA Medical Center, West Roxbury, Massachusetts, USA
Source:
Perfusion, 1 November 20, vol. 17, no. 6, pp. 407-413(7)
