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Morphological features of hypertrophic cardiomyopathy with congestive heart failure and a small left ventricular
M Tanaka1, H Fujiwara, T Onodera
1Department of Internal Medicine, Kyoto University, Japan.
Insights
In hypertrophic cardiomyopathy, enlarged heart muscle cells (myocytes) and disorganized fibers, not fibrosis, likely cause severe heart failure in patients with small left ventricles.
Area of Science:
- Cardiovascular Pathology
- Cardiac Morphology
- Heart Failure Pathophysiology
Background:
- Hypertrophic cardiomyopathy (HCM) can present with severe congestive heart failure (CHF), particularly in cases with a small left ventricular cavity.
- The underlying morphologic basis for this severe CHF in specific HCM subtypes remains incompletely understood.
Observation:
- Quantitative analysis of myocyte size, myocardial fiber disarray, and fibrosis was performed in two autopsy cases of HCM with small left ventricular cavities.
- These cases were compared to control HCM cases.
Findings:
- The two cases exhibited significantly larger myocytes and less myocardial fibrosis compared to controls.
- One case also demonstrated markedly extensive myocardial fiber disarray.
Implications:
- Myocyte hypertrophy and/or myocardial fiber disarray are likely key contributors to severe CHF in these specific HCM cases.
- These findings suggest that therapeutic strategies targeting myocyte size and fiber organization may be crucial for managing CHF in this patient population.
Abstract:
To clarify the morphologic basis of marked congestive heart failure in cases of hypertrophic cardiomyopathy with a small left ventricular cavity, the size of myocytes, the extent of myocardial fiber disarray and fibrosis were quantitatively evaluated in two autopsied cases. Compared with the control hypertrophic cardiomyopathy, both cases had larger myocytes and less fibrosis, and one of them had markedly extensive myocardial fiber disarray. Probably, the hypertrophy of the myocytes or myocardial fiber disarray or both rather than myocardial fibrosis are important in the pathogenesis of severe congestive heart failure in these cases.