Impact of chronic kidney disease on the incidence of peri-procedural myocardial injury in patients undergoing elective stent implantation.

BACKGROUND It is well known that chronic kidney disease is a strong independent predictor of adverse outcomes after percutaneous coronary intervention in patients with ischemic heart disease. Recently, peri-procedural myocardial injury has been associated with adverse cardiac events. The aim of this study was to investigate the relationship between renal function and peri-procedural myocardial injury in patients undergoing elective stent implantation. METHODS This study comprised 273 consecutive patients who underwent elective stent implantation. They were divided into two groups: estimated glomerular filtration rate (eGFR) <60 mL/min/1.73m(2) and eGFR ≥60 mL/min/1.73m(2). Peri-procedural TnT levels higher than three times the normal limit were defined as peri-procedural myocardial injury. RESULTS Patients with eGFR <60 mL/min/1.73m(2) showed a higher incidence of peri-procedural myocardial injury compared to patients with eGFR ≥60 mL/min/1.73m(2) (4.3 versus 20.9%, P < 0.0001). Even after a multivariate adjustment, the eGFR level predicted peri-procedural myocardial injury [odds ratio 0.92, 95% confidence interval (CI): 0.89-0.95, P < 0.0001]. Total stent length was also an independent predictor of peri-procedural myocardial injury (odds ratio 1.09, 95% CI: 1.02-1.16, P = 0.009). Using a receiver-operating curve analysis, eGFR level of 62.1 mL/min/1.73m(2) (sensitivity 93.3%, specificity 57.2%) was the best value (area under the curve = 0.803) to maximize the power of eGFR levels in predicting peri-procedural myocardial injury. CONCLUSIONS Patients with eGFR <60 mL/min/1.73m(2) were strongly associated with peri-procedural myocardial injury after elective stent implantation. Therefore, eGFR may be a simple and convenient predictor of peri-procedural myocardial injury.