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Predictors of Cardiac Surgery Patients Who Tolerate Blood Conservation in Cardiac Surgery
Makoto Mori1, Haoran Zhuo2, Fangfang Liu2
1Section of Cardiac Surgery, Yale University School of Medicine, New Haven, Connecticut.
Insights
Blood conservation in cardiac surgery significantly reduced red blood cell transfusions without increasing adverse outcomes. Key patient factors like older age and lower BMI predict safe tolerance, enabling targeted blood-saving strategies.
Area of Science:
- Cardiovascular Surgery
- Anesthesiology
- Transfusion Medicine
Background:
- The safety of blood conservation in cardiac surgery patients is not fully understood.
- Identifying patients who can safely tolerate reduced blood transfusions is crucial.
Purpose of the Study:
- To identify patient characteristics associated with safely tolerating blood conservation during cardiac operations.
- To determine predictors for patients who do not benefit from liberal transfusion strategies.
Main Methods:
- Retrospective review of 2,701 adult patients undergoing coronary artery bypass graft and/or aortic valve replacement (2011-2016).
- Application of a logistic regression model from a preintervention cohort to a postintervention cohort to identify transfusion predictors.
- Analysis of patient demographics, intraoperative hematocrit, and cardiopulmonary bypass use.
Main Results:
- Blood conservation intervention reduced red blood cell transfusion by 52% with no significant difference in measured outcomes.
- Predictors for safely tolerating blood conservation included age >75 years, BMI <30 kg/m², lowest intraoperative hematocrit of 22-25%, and cardiopulmonary bypass use.
- Older age (OR 1.71) and cardiopulmonary bypass use (OR 4.50) were significant predictors.
Conclusions:
- Blood conservation effectively reduces perioperative blood product use and may decrease the risk of postoperative renal failure.
- A specific patient profile amenable to safe blood conservation was identified, guiding targeted strategies.
- This research supports optimizing blood management in cardiac surgery.
Background:
Whether there is a cardiac surgical patient population that does not incur harm from blood conservation is unknown. This study aimed to identify patient characteristics associated with patients who safely tolerate blood conservation.
Methods:
We conducted a retrospective review of consecutive patients undergoing isolated coronary artery bypass graft surgery or isolated aortic valve replacement, or concomitant coronary artery bypass graft surgery and aortic valve replacement between 2011 and 2016, during which blood conservation intervention took place. Logistic regression derived from the preintervention cohort was applied to the postintervention cohort to identify patient characteristics associated with those predicted to be transfused in the preintervention era but were not in the postintervention era.
Results:
In this series of 2,701 adult patients undergoing cardiac operations, blood conservation intervention in 2014 led to a 52% reduction in red blood cell transfusion. Between preintervention and postintervention cohorts, there was no significant difference in the measured outcomes. A regression model derived from the preintervention cohort was applied to the postintervention cohort to identify predictors of cohort that do not derive benefit from liberal transfusion. This model demonstrated such patient characteristics to be age more than 75 years (odds ratio [OR] 1.71, 95% confidence interval [CI]: 1.09 to 2.68, p = 0.033), body mass index less than 30 kg/m2 (OR 1.5, 95% CI: 1.02 to 2.20, p = 0.044), lowest intraoperative hematocrit between 22 and 25 (OR 1.77, 95% CI: 1.16 to 2.68, p < 0.001), and cardiopulmonary bypass use (OR 4.50, 95% CI: 2.25 to 9.01, p < 0.001).
Conclusions:
Blood conservation can successfully yield reduction in perioperative blood product use, with associated decrease in the risk of postoperative renal failure. A select patient population who may tolerate blood conservation safely was identified, and that may guide a targeted blood conservation effort.
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