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Updated: Oct 24, 2026

Chronic Thromboembolic Pulmonary Hypertension and Assessment of Right Ventricular Function in the Piglet
Published on: November 4, 2015
[Echocardiographic and endomyocardial biopsy findings of right-sided hypertrophic obstructive cardiomyopathy]
Insights
Hypertrophic cardiomyopathy (HCM) with right-sided obstruction shows distinct septal protrusions on cross-sectional echocardiograms. Histology reveals more significant fibrosis and myocardial disarray in obstructive HCM cases.
Area of Science:
- Cardiology
- Pathology
Context:
- Hypertrophic cardiomyopathy (HCM) is a complex cardiac condition.
- Right-sided obstruction presents a specific challenge in HCM diagnosis and management.
Purpose:
- To differentiate hypertrophic cardiomyopathy (HCM) with right-sided obstruction from HCM without obstruction using echocardiography and histology.
- To identify characteristic echocardiographic and histopathological features associated with right-sided obstructive HCM.
Summary:
- Echocardiographic and histological studies compared four patients with obstructive HCM and five without.
- Cross-sectional echocardiography, particularly short-axis views, identified rightward septal protrusions in obstructive HCM.
- Histological analysis of right ventricular septal biopsies showed more interstitial fibrosis and myocardial fiber disarray in obstructive HCM.
Impact:
- Cross-sectional echocardiography is a reliable tool for detecting right-sided obstruction in HCM.
- Histopathological findings correlate with the presence and severity of right-sided obstruction in HCM.
- Improved diagnostic accuracy for obstructive HCM can lead to better patient management.
Abstract:
Echocardiographic and histological studies were performed for four patients with hypertrophic cardiomyopathy (HCM) with right-sided obstruction (group A) and for five HCM patients without right-sided obstruction (group B). The clinical diagnosis of HCM was established by cardiac catheterization and right and left ventriculography for all nine patients, and confirmed by necropsy in one patient in group A. M-mode and cross-sectional echocardiography were performed in all. Endomyocardial biopsy of the right ventricular septum was performed for all four patients in group A and for three patients in group B. M-mode echocardiography demonstrated no characteristic features suggesting right intraventricular obstruction, but cross-sectional echocardiograms, especially with short-axis views, reliably indicated conspicuous rightward septal protrusions in right-sided obstructive HCM. Histological changes in the right ventricular septum consisting of fibrosis of the interstitium and disarray of myocardial fibers were more striking in patients with HCM with right-sided obstruction than those without such obstruction.
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