Periprocedural Myocardial Injury After Recanalization of Single Chronic Coronary Occlusion - A Propensity Score Analysis Comparing Long-Term Clinical Outcomes.

Background: Rates and importance of periprocedural myocardial injury (PMI) after crossing coronary chronic total occlusions (CTOs) is not well understood. This study sought to investigate long-term clinical implications of PMI in patients undergoing percutaneous coronary intervention (PCI) for single CTO utilizing antegrade technique.
Methods: Out of 11,957 patients undergoing non-urgent PCI, a total of 1110 patients with symptomatic angina and single CTO were treated by antegrade PCI and observed for up to 10 years. The primary objective included cardiac death, while the secondary aim comprised all major adverse cardiovascular and cerebrovascular event (MACCE) rate.
Results: Troponin-defined PMI occurred in 4.7% patients (n = 52). At 1 year, the cardiac death and MACCE rates were significantly higher in patients with vs without PMI (hazard ratio [HR], 5.72; 95% confidence interval [CI], 1.59-20.49; P=.01; HR, 1.84; 95% CI, 1.07-3.18; P=.03, respectively). At long-term follow-up, patients with PMI had a trend toward a higher incidence of cardiac death than patients without PMI (HR, 2.51; 95% CI, 0.99-6.33; P=.05) and no differences were demonstrated in terms of overall MACCE between both groups (HR, 1.19; 95% CI, 0.73-1.93; P=.49). After propensity score adjustment, no significant differences were observed regarding the short-term and long-term outcomes.
Conclusion: CTO-PCI is a safe procedure if routinely performed in symptomatic patients at a high-volume center. PMI does not influence long-term outcomes after antegrade CTO-PCI.