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Troponin-I Level After Major Noncardiac Surgery and Its Association With Long-Term Mortality.
International Heart Journal 2016 May 26
Individuals with intermediate to high cardiac risk for major noncardiac surgery suffer from perioperative myocardial ischemic injury. The purpose of this study was to evaluate the long-term impact of postoperative cardiac troponin elevation on clinical outcome after major noncardiac surgery.Patients (n = 750) aged ≥ 50 years who underwent major noncardiac surgery were eligible for the study. Postoperative cardiac troponin-I data were collected retrospectively and consecutively. The primary outcome measure was allcause mortality. The median follow-up period was 1727 days in all patients.Among 750 patients, 92 (12.2%) showed elevated postoperative troponin-I above 0.10 ng/mL. Operative mortality was 4.1% (31 subjects), and patients with troponin-I elevation showed a higher operative mortality rate (RR: 4.23, 95% CI: 2.67-11.31, P < 0.001). In multivariate Cox regression analysis, a troponin-I concentration above 0.10 ng/mL was associated with all-cause mortality (RR: 1.73, 95% CI: 1.27-2.36, P < 0.001). It should be noted that there was a significant difference between patients with elevated and non-elevated troponin-I in the rate of mortality until 6 months. However, these differences disappeared after 6 months.An elevated troponin-I level conferred an increase in mortality during the 7 year follow-up period after major noncardiac surgery. This difference in mortality was mainly derived from the result within the first 6 months.
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