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Methods A total of 350 consecutive patients diagnosed with HCM (mean age 54 ± 12, 278 males) underwent cardiac magnetic resonance (CMR) and echocardiography. All enrolled patients were prospectively followed up for adverse clinical events including cardiac death, admission for heart failure and cerebrovascular accident. We divided the subjects into 4 phenotypes according to the location of hypertrophic segment; asymmetrical septal hypertrophy (ASH), apical, concentric and septal/apical type. On CMR, the LV volumetric parameters were measured, and the amount of late gadolinium enhancement (LGE) was calculated with grayscale thresholds of 6 SD above the mean signal intensity for normal remote myocardium. Echocardiographic evaluations included left atrial volume index, mitral inflow pattern, tissue Doppler of mitral annulus and LV dimension. Median follow up duration was 37 months. Results The prevalence of AAn on CMR was 14.3%, which was significantly higher compared to previously reported data. AAn was detected in all groups of HCM regardless of type (16.8% in ASH type, 15.3% in apical type, 17.9% in concentric type, and 9.1% in septal/apical type of HCM). Clinical manifestations and LV volumetric parameters on CMR did not differ between the HCM patients with and without AAn. The frequency and the amount of LGE were not different between two groups (frequency; 94% vs. 93.3%, p=1.00, extent; 11.7±8.9 vs. 13.0±10.3, p=0.43). During follow up, the frequency of adverse clinical events did not differ between patients with and without AAn (p=0.259).

journal of cardiovascular magnetic resonance

Prevalence and characteristics of apical aneurysm in hypertrophic cardiomyopathy: a prospective analysis of cardiac magnetic resonance findings and clinical outcomes