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Updated: Nov 2, 2025

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Is there a Predictive Value of Hemoglobin A1C for Complications of Cardiac Surgery?
Selen Ozturk1, Ilyas Kayacoglu1, Yavuz Sensoz1
1Department of Anesthesiology, Goztepe Education and Research Hospital, Istanbul, Turkey.
Insights
Elevated preoperative hemoglobin A1c levels are linked to increased complications after cardiac surgery, including infection, stroke, and organ failure. This finding highlights the importance of glycemic control before surgery.
Area of Science:
- Cardiovascular Surgery
- Endocrinology
- Clinical Research
Background:
- Preoperative glycemic control is crucial for patient outcomes.
- Elevated hemoglobin A1c indicates poor long-term glycemic control.
- Cardiac surgery patients with diabetes are at higher risk for complications.
Approach:
- A comprehensive meta-analysis was conducted.
- Searched PubMed, Scopus, Web of Science, and Ovid databases.
- Included 33 studies with 3500 patients examining preoperative hemoglobin A1c and postoperative complications.
Key Points:
- Preoperative hemoglobin A1c levels correlate with mediastinitis, stroke, pneumonia, sepsis, renal failure, and mortality.
- Heterogeneity was noted for myocardial infarction, atrial fibrillation, and multiorgan failure.
- Higher hemoglobin A1c levels are associated with a greater risk of adverse events.
Conclusions:
- Preoperative hemoglobin A1c is a significant predictor of postoperative complications in cardiac surgery.
- Managing glycemic control preoperatively may reduce surgical risks.
- Further research is warranted to explore interventions for optimizing glycemic control in this population.
Objective:
To investigate the effect of preoperative hemoglobin A1c levels for the complications of cardiac surgery.
Study Design:
Meta-analysis. Place of Study: Siyami Ersek Chest and Cardiovascular Surgery Education and Research Hospital, Istanbul, Turkey.
Methodology:
PubMed, Scopus, Web of Science and Ovid electronic databases were used. The studies were included the recorded preoperative levels of hemoglobin A1C and postoperative complications developed after cardiac surgery. Results of the studies were evaluated, based on either random or fixed effect model, according to presence of heterogeneity (I2>25%).
Results:
In total, 2,312 articles were obtained. After reviewing the articles, 33 articles covering 3500 patients meeting the inclusion criteria were included. The results pointed out that there was a relationship between preoperative hemoglobin A1c levels and mediastinitis, stroke, pneumonia, sepsis, renal failure and mortality. Heterogeneity was observed for myocardial infarction, atrial fibrillation and multiorgan failure (I2 >25%).
Conclusion:
Preoperative hemoglobin A1C levels were associated with development of mediastinitis, stroke, pneumonia, sepsis, renal failure and mortality after cardiac surgery. Key Words: Hemoglobin A1C, Cardiac surgery, Complication, Meta-analysis.
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