Related Experiment Video
Updated: Aug 1, 2026
Evaluation of a Novel Laser-assisted Coronary Anastomotic Connector - the Trinity Clip - in a Porcine Off-pump Bypass Model
Published on: November 24, 2014
Blood use in patients undergoing repeat coronary artery bypass graft procedures: multivariate analysis
A W Bracey1, R Radovanĉević, B Radovanĉević
1Department of Surgery, Texas Heart Institute, Houston, USA.
Insights
Patients undergoing repeat coronary artery bypass graft (CABG) surgery require significantly more blood transfusions than those undergoing primary CABG. This increased demand is linked to greater blood loss and longer cardiopulmonary bypass times.
Area of Science:
- Cardiovascular Surgery
- Transfusion Medicine
- Anesthesiology
Background:
- Clinical consensus suggests repeat coronary artery bypass graft (CABG) operations necessitate greater blood transfusion volumes compared to primary CABG.
- This study aimed to quantify this difference and identify contributing factors.
Purpose of the Study:
- To compare blood transfusion requirements between primary and repeat CABG procedures.
- To identify variables associated with increased transfusion needs in repeat CABG patients.
Main Methods:
- Retrospective review of 196 primary CABG and 65 repeat CABG patients.
- Data collected included transfusion volumes, preoperative/postoperative hemoglobin and hematocrit, cardiopulmonary bypass duration, graft details, and blood loss estimates.
Main Results:
- Repeat CABG patients experienced 35% greater blood loss and required 75% more blood components.
- Significantly higher transfusion rates for red cells (3.8 vs. 2.2 units), platelets (2.9 vs. 1.1 units), and fresh-frozen plasma (1.6 vs. 0.8 units) were observed in the repeat group.
- Blood loss, prolonged cardiopulmonary bypass, lower preoperative hemoglobin, and aspirin use predicted red cell transfusion rates in repeat CABG patients.
Conclusions:
- Repeat CABG surgery is associated with substantially higher blood transfusion rates.
- Factors contributing to increased transfusion needs include microvascular bleeding, extended cardiopulmonary bypass, lower preoperative hemoglobin, and antiplatelet medication use.
Background:
The prevailing clinical opinion is that patients undergoing repeat coronary artery bypass graft (CABG) operation require more blood transfusions than do patients undergoing primary CABG operation. To determine the extent of this increased demand and the variables responsible for it, the cases of 196 patients who had undergone primary procedures and 65 patients who had had repeat procedures at the same institution were reviewed.
Study Design And Methods:
To analyze the differences in transfusion requirements for these two groups, the following data were obtained: number of transfusions given between the time of surgery and the time of hospital discharge; preoperative hemoglobin (Hb), hematocrit (Hct), prothrombin time, and platelet count; Hb and Hct at hospital discharge; time the patient was on cardiopulmonary bypass; number and type of grafts; estimates of intraoperative blood loss; and chest-tube blood shed during the first 48 hours after surgery.
Results:
The groups were comparable with respect to age, body weight, preoperative Hb and Hct, number of grafts, and aspirin exposure. Patients in the repeat group had 35-percent greater blood loss and required 75-percent more blood components than did the patients undergoing primary procedures. The mean number of blood components transfused per patient was as follows: red cells, 3.8 +/- 0.5 units in repeat patients and 2.2 +/- 0.2 units in primary patients (p = 0.002); platelets, 2.9 +/- 0.9 vs. 1.1 +/- 0.2 (p = 0.043); fresh-frozen plasma, 1.6 +/- 0.4 vs. 0.8 +/- 0.1 (p = 0.044). Analysis of variables by regression method for repeat patients showed a predictive effect of blood loss (p < 0.0001), prolonged time on cardiopulmonary bypass (p < 0.0001), preoperative Hb (p = 0.0003), and aspirin exposure (p = 0.0094) on red cell transfusion rate in repeat patients (R-square = 0.7778, Prob > f = 0.0001).
Conclusion:
Repeat CABG patients have higher transfusion rates. These findings may be attributed to the increased microvascular bleeding, prolonged time on cardiopulmonary bypass, lower preoperative Hb, and the use of preoperative antiplatelet medications.
More Related Videos
10:03Coronary Progenitor Cells and Soluble Biomarkers in Cardiovascular Prognosis after Coronary Angioplasty
Published on: January 28, 2020
05:25Surgical Porcine Model of Chronic Myocardial Ischemia Treated by Exosome-laden Collagen Patch and Off-pump Coronary Artery Bypass Graft
Published on: September 15, 2023
