This case series highlights that right ventricular hypertrophic obstruction can co-occur with various forms of left ventricular hypertrophic cardiomyopathy, including apical hypertrophy.
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Raises awareness of coexistent RV obstruction across HCM subtypes; hypothesis-generating for prevalence and outcomes.
Hypertrophic cardiomyopathy (HCM) is most probably a genetically transmitted disease with different clinical and hemodynamic features. In hypertrophic obstructive cardiomyopathy (HOCM) the obstruction is predominantly in the left ventricular outflow tract (IHSS). In a minority of cases the obstruction is strictly located in midventricle (midventricular obstruction, MO). Hypertrophic nonobstructive cardiomyopathy (HNCM) includes asymmetric septal hypertrophy (ASH) and apical hypertrophy (AH). Right ventricular hypertrophic obstruction (RVHO) is an uncommon type of HCM and is almost always combined with other types of left ventricular HCM. We describe in the present report 1 case of RVHO with IHSS, 2 cases with MO and, to our knowledge, the first case with AH.
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Stierle et al. (1987) studied this question.
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