Sex-Related Differences in the Impact of Systemic Hypertension on Left Ventricular Remodeling in Patients with Hypertrophic Obstructive Cardiomyopathy.

ABSTRACT

BACKGROUND: The clinical condition of hypertrophic obstructive cardiomyopathy (HOCM) and concomitant systemic hypertension is growing more and more prevalent, and it brings about a challenging diagnostic and therapeutic dilemma. However, whether systemic hypertension has an impact on HOCM, and whether sex-related differences exist in this impact, remains unclear. METHODS: A total of 453 HOCM patients (age 48.7 ± 12.8 years, 252 [55.6%] males) were recruited in this study. There were 150 patients (33.1%, 81 males and 69 females) with a history of controlled systemic hypertension. Cardiac magnetic resonance (CMR) imaging was performed in all patients. Left ventricular (LV) remodeling index (LVRI) was determined by CMR. LVRI >1.3 g/mL was defined as pathological LV remodeling. RESULTS: Men had significantly greater LVRI (1.40 ± 0.54 vs. 1.15 ± 0.38 g/mL, p < 0.001) and LVRI >1.3 g/mL (p = 0.002), compared with women. The incidence of syncope and 5-year sudden cardiac death risk score were significantly lower in HOCM with hypertension than those without hypertension. LVRI (p = 0.003) and LVRI >1.3 g/mL (p = 0.007) were significantly smaller in males with hypertension, but not in females with hypertension. However, log cardiac troponin I and log N-terminal pro-B-type natriuretic peptide were positively correlated with LVRI in men and women. On multivariable logistic analysis, hypertension (OR 0.172, 95% CI 0.056-0.528, p = 0.002) remained an independent determinant of pathological LV remodeling in males, whereas not in females. CONCLUSIONS: There were significant sex differences in the impact of systemic hypertension on LV remodeling in patients with HOCM. Controlled systemic hypertension may contribute to improving LV remodeling in male patients with HOCM, but not in females.