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Mini-cardiopulmonary bypass impact on blood conservation strategy in coronary artery bypass grafting
Mohamed Abdel Aal1, Nezar ElNahal, Bakir Moustafa Bakir
1King Fahad Cardiac Center and College of Medicine, King Saud University, Riyadh, Kingdom of Saudi Arabia. malaal2@hotmail.com
Insights
Mini-bypass circuits significantly reduce blood product use and postoperative bleeding in coronary artery bypass grafting (CABG) patients. This minimized cardiopulmonary bypass (CPB) approach improves outcomes by lowering transfusion needs and drainage.
Area of Science:
- Cardiovascular Surgery
- Anesthesiology
- Transfusion Medicine
Background:
- Cardiopulmonary bypass (CPB) can cause adverse effects.
- Minimizing CPB circuit volume may mitigate these effects.
- Standard CPB circuits often require significant blood product transfusions.
Purpose of the Study:
- To evaluate the efficacy of a mini-bypass circuit in reducing homologous blood product use.
- To assess the impact of a minimized CPB circuit on postoperative bleeding in coronary artery bypass grafting (CABG).
- To compare blood loss and transfusion requirements between minimized and standard CPB circuits.
Main Methods:
- Prospective randomized trial of 80 patients undergoing elective CABG.
- Group A: minimized bypass circuit (Medtronic Resting Heart Circuit). Group B: standard CPB circuit (Stockert III).
- Measured hemoglobin, hematocrit, platelet counts, blood product usage, postoperative drainage, ventilation time, inotropic support, and ICU stay.
Main Results:
- Mini-bypass group showed statistically significant reductions in transfused red blood cells (1.47 vs. 2.05 units), fresh frozen plasma (2.5 vs. 3.55 units), and platelets.
- Postoperative drainage in 24 hours was significantly lower in the mini-bypass group (531.62 vs. 729 ml).
- Higher mean hemoglobin (10.19 vs. 9.4 g/dl) and hematocrit (33% vs. 27%) levels were observed in the mini-bypass group, along with reduced ventilation duration, ICU stay, and inotropic support.
Conclusions:
- Mini-bypass circuits significantly decrease donor blood usage in routine CABG.
- The adoption of mini-bypass is associated with reduced postoperative bleeding.
- Minimized CPB circuits contribute to overall lower patient morbidity.
Objective:
Cardiopulmonary bypass (CPB) using a closed circuit system with minimal priming volume can be a solution to ameliorate adverse effects of CPB. We hypothesize that the use of mini-bypass in routine coronary artery bypass grafting (CABG) reduces homologous blood product use and postoperative bleeding. The study is designed to determine the differences in blood loss and transfusion requirements associated with a minimized CPB circuit vs. a standard bypass circuit.
Methods:
From February 2009 to August 2009, 80 patients were prospectively randomized to undergo elective CABG. Group A included 40 patients who had the minimized bypass circuit (Medtronic Resting Heart Circuit). Group B had an equal number of patients who had the standard CPB circuit (Stockert III, SEC.BM). Laboratory parameters for hemoglobin, hematocrit and platelet count were measured at baseline after initiation of CPB and after bypass. Blood usage was controlled by study-specific protocol (transfusion for hemoglobin <8 g/dl). Records were kept for blood products. The chest and mediastinal drainage was monitored for the first 24 postoperative hours. Ventilation time, inotropic use and intensive care unit (ICU) stay was compared in both groups.
Results:
There were no statistical differences in terms of patients' demographics. Statistically significant differences were seen in transfused red blood cells volume (1.47±1.13 units in group A vs. 2.05±1.19 in group B, P<0.05), fresh frozen plasma (2.5±1.62 unit vs. 3.55±2.58 units, P<0.001), platelets (1.95±2.95 units vs. 3.23±2.85), and postoperative drainage in 24 hours (531.62±220.12 ml vs. 729±294.9 ml, P<0.05). The hematocrit was 33±5% in group A, and 27±1% in group B. There was statistical differences seen in the mean hemoglobin level which was 10.19±0.65 g/dl in group A, and 9.4±0.68 g/dl in group B. There was statistical difference in the duration of ventilation, length of ICU stay. The requirement of inotropic support was lower in group A.
Conclusions:
The adoption of mini-bypass significantly reduces morbidity including donor blood usage and postoperative bleeding in routine CABG patients.
