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Background  Hypoxia-inducible factor-1α (HIF-1α) and heme oxygenase-1(HO-1) are involved in the tissue hypoxic response.    Hypothesis  HIF-1α and HO-1 levels may predict cardiac ischemia and adverse cardiac events during non-cardiac surgery.    Methods  HIF-1α and HO-1 levels were determined in elderly patients undergoing non-cardiac surgery preoperatively and at 30 minutes, 48 and 72 hours postoperatively.  Results  were analyzed with respect to the occurrence of adverse cardiac events.    Results  A total of 380 patients with a mean age of 65.3 years were included, and 54 (14.2%) who had adverse cardiac events during or after the surgery. HIF-1α and HO-1 levels in the adverse cardiac event group were significantly higher than in the group without adverse cardiac events at each time point (all,  P <0.05). In multivariates regression analysis, the odds of an adverse cardiac event was increased by every 1-year increase in age (odd ratio [OR] 1.39,  P <0.001), abnormal ECG at baseline (OR 2.27,  P  = 0.048), myocardial infarction history (OR 3.18,  P  = 0.015), and positive baseline cTnI level were associated with an increased likelihood of an adverse cardiac event (OR 8.78,  P  = 0.019), and for every 1 unit increase of HO-1, the odds of an adverse cardiac event increased by 1.30 ( P  = 0.002).    Conclusion  Determination of preoperative HO-1 levels may aid in identifying patients at risk of developing ischemic cardiac events.

Preoperative HO-1 Levels as Prognostic Factor for Adverse Cardiac Events in Elder Patients Undergoing Non-Cardiac Surgery