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Preoperative coagulation studies to predict blood component usage in coronary artery bypass graft surgery
S Josefy1, R Briones, B J Bryant
1United Regional Health Care System, Wichita Falls, TX, USA.
Insights
Low fibrinogen levels and older patient age may predict increased blood usage in cardiac surgery patients undergoing coronary artery bypass graft (CABG) procedures. Further research is needed to confirm these findings.
Area of Science:
- Cardiology
- Hematology
- Surgical Complications
Background:
- Bleeding is a significant complication following cardiac surgery.
- Preoperative fibrinogen levels are recognized as a predictor of blood loss during coronary artery bypass graft (CABG) surgery.
Purpose of the Study:
- To compare the predictive value of fibrinogen concentration against prothrombin time (PT) and activated partial thromboplastin time (aPTT) for blood usage in CABG patients.
- To identify key preoperative factors associated with increased blood transfusion requirements.
Main Methods:
- Prospective study of 35 patients undergoing CABG surgery who were not on clopidogrel bisulfate.
- Evaluation of patient age, preoperative coagulation tests (PT, INR, aPTT, fibrinogen), and blood component transfusion numbers.
- Statistical analysis to determine predictors of blood usage, with p < 0.05 considered significant.
Main Results:
- Mean blood usage was 6 units per patient.
- Patient age approached statistical significance as a predictor of blood usage.
- Fibrinogen levels showed a trend toward significance, indicating a potential association with blood usage more than PT or aPTT.
- Increased age and low plasma fibrinogen concentrations were associated with higher blood usage.
Conclusions:
- While not statistically significant in this cohort, patient age and low fibrinogen levels showed a trend towards predicting increased blood usage in CABG patients.
- Fibrinogen concentration may be a more relevant predictor of blood usage than PT or aPTT in this context.
- Larger studies are recommended to validate these preliminary findings and establish clearer predictive value.
Abstract:
Bleeding remains a serious complication of cardiac surgery. Studies indicate that preoperative fibrinogen concentration is an independent predictor of blood loss during coronary artery bypass graft (CABG) surgery. This study evaluates whether fibrinogen concentration is a better predictor of blood usage than the prothrombin time (PT) and activated partial thromboplastin time (aPTT) tests. Patients not taking clopidogrel bisulfate who underwent CABG surgery during a 3-month period at a 350-bed community hospital were included in this prospective study. The parameters evaluated included patient’s age, preoperative coagulation test results (PT, international normalized ratio [INR], aPTT, fibrinogen), and number of blood components transfused. A probability value of less than 0.05 was deemed significant. Thirty-five patients were included in this study. Mean blood usage was 6 units. Patient’s age approached significance as a predictor of blood usage, and fibrinogen levels trended toward significance more than the other coagulation parameters. In this study, the increased age of the patient and low plasma concentrations of fibrinogen were associated with increased blood usage. Although no indicators clearly demonstrated statistical significance, the vast difference in the probability values for patients’ ages and fibrinogen levels indicated that there was a trend toward significance in blood usage for CABG patients. Further studies with larger patient populations are indicated.
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