Higuchi S, Minami Y, Shoda M, et al. - In this study including 414 patients with hypertrophic cardiomyopathy (HCM) (mean age, 51±16 years; 64.5% men), researchers determined if there exists a link between presence of first‐degree atrioventricular block (AVB) and HCM‐related death. At the time of the initial assessment, measurements of the P‐R interval were taken. Patients were grouped into those with and without first‐degree AVB (defined as a P‐R interval ≥ 200 ms). Findings are suggestive of a likely association of first‐degree AVB with HCM‐related death, including the combined endpoint of sudden death or potentially lethal arrhythmic events.