Data Sheet 1_Temporal evolution of clinical event risk after primary-prevention ICD implantation: Chagas vs. non-Chagas dilated cardiomyopathy.docx

The endpoint occurred in 109 patients. Cumulative incidence was lower in Chagas patients at 1 year (2.1% vs. 12.2%) and 5 years (19.5% vs. 42.4%), and Chagas patients accumulated 682 additional event-free days at 10-year RMST (95% CI: 258–1047; p = 0.001). Chagas cardiomyopathy was associated with lower composite risk (hazard ratio 0.58; 95% CI: 0.37–0.91; p = 0.018), an association confined to the first 5 years (0.35; 0.17–0.75; p = 0.007) and no longer detectable thereafter (0.85; 0.47–1.54; p = 0.587), with 28 and 56 patients at risk at 5 years and 11 and 20 at 10 years.

The wide confidence interval and small population at risk in the late period mean that absence of a detectable difference should not be read as evidence of equivalent risk. These findings are hypothesis-generating and require confirmation in larger cohorts.</p>