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Tolerance of intraoperative hemoglobin decrease during cardiac surgery
Esther Hogervorst1, Peter Rosseel, Johanna van der Bom
1Center for Clinical Transfusion Reseach, Sanquin/LUMC, Leiden, the Netherlands.
Insights
A significant drop in hemoglobin (Hb) during cardiac surgery, even above 7.0 g/dL, is linked to adverse outcomes. This finding highlights the importance of monitoring Hb decline in cardiac patients.
Area of Science:
- Cardiology
- Anesthesiology
- Transfusion Medicine
Background:
- A substantial decrease in hemoglobin (Hb) during cardiac surgery may indicate poor patient outcomes.
- This risk persists even when absolute Hb levels remain above the typical transfusion trigger of 7.0 g/dL.
Purpose of the Study:
- To investigate the association between a significant intraoperative Hb decline (≥50%) and adverse clinical outcomes in cardiac surgery patients.
- To determine if Hb drop magnitude, independent of nadir Hb level, predicts postoperative complications.
Main Methods:
- A single-center retrospective study analyzed 11,508 cardiac surgery patients with normal preoperative Hb levels.
- Logistic regression modeling was employed to assess the relationship between Hb decrease and a composite endpoint.
- The composite endpoint included in-hospital mortality, stroke, myocardial infarction, and renal failure.
Main Results:
- Patients experiencing a Hb decrease of at least 50% (nadir Hb ≥7.0 g/dL) showed a higher incidence of the composite endpoint compared to controls (aOR, 1.27; 95% CI, 1.14-1.41).
- A subgroup analysis revealed that a Hb decrease ≥50% was associated with adverse outcomes, irrespective of whether the nadir Hb fell below 7.0 g/dL.
Conclusions:
- A hemoglobin decrease of at least 50% from baseline during cardiac surgery is an independent predictor of adverse outcomes.
- These findings suggest that the magnitude of Hb drop, not just the absolute level, is critical for risk assessment in cardiac surgery.
Background:
It has been suggested that a decrease of at least 50% from the preoperative hemoglobin (Hb) level during cardiac surgery is associated with adverse outcomes even if the absolute Hb level remains above the commonly used transfusion threshold of 7.0 g/dL. In this study the relation between intraoperative Hb decline of at least 50% and a composite endpoint was analyzed.
Study Design And Methods:
This single-center study comprised 11,508 patients who underwent cardiac surgery and had normal preoperative Hb levels (12.0-16.0 g/dL in women, 13.0-18.0 g/dL in men) between January 2001 and December 2011. Logistic regression modeling was used. The composite endpoint comprised in-hospital mortality, stroke, myocardial infarction, and renal failure.
Results:
Patients whose Hb did not decrease at least 50% and remained above 7 g/dL were used as reference (n = 9672). A total of 363 (3.2%) patients had an intraoperative Hb of less than 7 g/dL during surgery but a Hb decrease of less than 50%; 876 patients (7.4%) showed both a nadir Hb less than 7 g/dL and a Hb decrease of at least 50%, while 597 (5.2%) had a Hb decrease of at least 50% and a nadir Hb of at least 7 g/dL. In this last group the incidence of the composite endpoint was higher than in patients in the reference group (adjusted odds ratio, 1.27; 95% confidence interval, 1.14-1.41).
Conclusions:
Our findings show that a decrease of at least 50% from baseline Hb during cardiac surgery is associated with adverse outcomes, even if the absolute Hb level remains higher than the commonly used transfusion threshold of 7.0 g/dL.
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