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A chronic total occlusion (CTO) may increase the risk of appropriate implantable cardioverter-defibrillator (ICD) therapy. Therefore, we evaluated all patients who received an ICD during 5-year follow-up in the EXPLORE trial. Of 22 ICD patients, twelve were randomized to CTO percutaneous coronary intervention (PCI) and 10 to no revascularizaton of the CTO. Appropriate ICD therapy occurred in 1 patient in the CTO-PCI group. Compared with the 280 non-ICD patients in the EXPLORE trial, the 22 ICD patients had higher risk of adverse cardiac