Objective: This study evaluated the angiographic characteristics and clinical outcomes of chronic total occlusion (CTO) percutaneous coronary intervention (PCI) among patients with and without a history of myocardial infarction (MI).
Background: The pathogenesis of CTO and myocardial viability are different in cases with or without previous MI. However, the lesion characteristics and clinical outcomes are unclear for these two groups.
Methods: We reviewed consecutive patients who underwent single-vessel CTO PCI from 2010 to 2013. Patients were classified according to their history of MI. Acute procedural results were classified as optimal recanalization, suboptimal recanalization, or technical failure. The primary endpoint was the 5 year rate of cardiac death.
Results: We identified 2,191 eligible patients, including 859 patients (39.2%) with previous MI. The overall technical success rate was 74.4%. Relative to the non-MI group, the MI group had a larger reference vessel diameter (3.0 ± 0.5 vs. 2.9 ± 0.4 mm, p = .002), a lower proportion of Werner grade ≥ 1 collateral circulation (65.4 vs. 79.2%, p < .001), a higher proportion of optimal recanalization (63.1 vs. 58.6%, p = .006), and a higher 5-year rate of cardiac death (3.9 vs. 2.1%, p = .02). In the MI group, suboptimal recanalization was associated with a significantly higher 5-year rate of spontaneous MI, relative to optimal recanalization and technical failure (11.7 vs. 4.6 vs. 4.1%, p = .006).
Conclusions: Patients with CTO and previous MI had a larger reference vessel diameter, lower level of collateral circulation, and higher proportion of optimal recanalization. However, suboptimal recanalization in these patients was associated with an increased risk of spontaneous MI.