Transfusion Use and Hemoglobin Levels by Blood Conservation Method After Cardiopulmonary Bypass

Area of Science:

• Cardiovascular Surgery
• Anesthesiology
• Critical Care Medicine

Background:

• Modified ultrafiltration (MUF) and cell washing are suggested for blood conservation post-cardiopulmonary bypass (CPB).
• Limited outcome data exists for these blood management strategies.
• This study compares online MUF, off-line MUF, and centrifugation for blood conservation.

Purpose of the Study:

• To compare the effectiveness of online MUF, off-line MUF, and centrifugation in blood conservation after CPB.
• To evaluate transfusion rates, hemoglobin levels, and fluid balance among the different methods.
• To assess coagulation and organ function biomarkers post-CPB.

Main Methods:

• A prospective cohort study of 99 patients undergoing CPB.
• Patients were divided into three groups: online MUF (n=35), off-line MUF (n=30), and centrifugation (n=34).
• Primary outcome was transfusion by 18 hours; secondary outcomes included hemoglobin, fluid balance, and biomarkers.

Main Results:

• Transfusion rates by 18 hours were 22.9% (online MUF), 6.7% (off-line MUF), and 14.7% (centrifugation) (P=.19).
• Percentage weight gain differed significantly (P<.0001), with online MUF showing the highest gain (5.7%).
• Hemoglobin increase from baseline to 18 hours was greatest in the online MUF group compared to off-line MUF (P=.002).

Conclusions:

• Online MUF did not demonstrate a reduction in blood transfusion rates compared to off-line MUF or centrifugation.
• Off-line MUF was associated with the lowest transfusion frequency.
• Further randomized controlled trials are needed to confirm these findings on blood conservation strategies post-CPB.