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Hypertrophic cardiomyopathy without asymmetric hypertrophy
Insights
Inherited hypertrophic cardiomyopathy can present atypically, challenging diagnosis based solely on gross anatomy. This case highlights the importance of histological examination for accurate identification of myocardial disorders.
Area of Science:
- Cardiology
- Genetics
- Pathology
Background:
- A 49-year-old female with congestive heart failure and heart block presented with clinical and echocardiographic findings suggestive of atypical dilated cardiomyopathy.
- The patient ultimately died of cerebral embolism.
Observation:
- Necropsy revealed slight dilation of all cardiac chambers with normal interventricular septum and left ventricular wall thickness.
- Histological examination showed extensive myocardial disarray, particularly in the interventricular septum.
Findings:
- The patient's father had similar clinical findings, and a brother had typical hypertrophic cardiomyopathy.
- The findings suggest the patient likely had inherited hypertrophic cardiomyopathy, despite initial atypical presentation.
Implications:
- This case underscores the diagnostic challenges of hypertrophic cardiomyopathy when relying solely on left ventricular gross anatomy.
- Histological evaluation is crucial for diagnosing inherited cardiomyopathies with variable presentations.
Abstract:
A 49-year-old women with congestive heart failure and heart block died of cerebral embolism. Clinical and echocardiographic findings suggested a diagnosis of atypical dilated cardiomyopathy with predominantly right ventricular involvement. At necropsy, all the cardiac chambers were slightly dilated and the interventricular septum and the left ventricular wall were of normal thickness and symmetry. Histological examination, however, disclosed extensive disarray of abnormal myocardial tissue, especially in the interventricular septum. Her father had similar clinical and echocardiographic findings, while one of her brothers had typical hypertrophic cardiomyopathy at necropsy. It is likely that the patient actually had inherited hypertrophic cardiomyopathy. The case illustrates the difficulty in diagnosing hypertrophic cardiomyopathy when based solely on the left ventricular gross anatomy.