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The clinical features of heart failure (HF) in patients with hypertrophic cardiomyopathy (HCM) in Japan have not been fully elucidated.Methods and Results: In 293 patients with HCM (median age at registration, 65 (57-72) years) in a prospective cardiomyopathy registration network in Kochi Prefecture (Kochi RYOMA study), HF events (HF death or hospitalization for HF) occurred in 35 patients (11.9%) (median age, 76 (69-80) years), including 11 HF deaths during a median follow-up of 6.1 years. The 5-year HF events rate was 9.6%. Atrial fibrillation, low percentage of fractional shortening, and high B-type natriuretic peptide level at registration were predictors of HF events. The combination of these 3 factors had a relatively high positive predictive value (55%) for HF events and none of them had a high negative predictive value (99%). There were 4 types of HF profile: left ventricular (LV) systolic dysfunction (40%), severe LV diastolic dysfunction (34%), LV outflow tract obstruction (LVOTO) (20%), and primary mitral regurgitation (MR) (6%). HF deaths occurred in patients with LV systolic dysfunction or LV diastolic dysfunction, but none of patients with LVOTO or primary MR due to additional invasive therapies.

Clinical Features of Heart Failure in Patients With Hypertrophic Cardiomyopathy in a Regional Japanese Cohort ― Results From the Kochi RYOMA Study ―