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[Hypertrophic and/or obstructive primary cardiomyopathies: genetic, etiologic, physiopathologic aspects]
P Merlet1, M Chatila, M Scherrer
1Service de cardiologie, CHU Henri-Mondor, Créteil.
Insights
Hypertrophic cardiomyopathy (HCM) presents variably with asymmetrical septal hypertrophy and abnormal myocardial structure. Its complex pathophysiology involves potential adrenergic and calcium flux abnormalities, impacting diastolic function and causing ischemia.
Area of Science:
- Cardiology
- Genetics
- Pathology
Context:
- Hypertrophic cardiomyopathy (HCM) is a genetically influenced cardiac condition with diverse clinical manifestations.
- Understanding the morphological and physiological variations in HCM is crucial for diagnosis and management.
Purpose:
- To elucidate the variable morphological features, presentation, and pathophysiology of hypertrophic cardiomyopathy.
- To explore the underlying mechanisms contributing to HCM, including genetic transmission, structural abnormalities, and functional deficits.
Summary:
- HCM exhibits asymmetrical hypertrophy, predominantly in the septum, with myocyte disorganization, fibrosis, and small coronary arteries.
- Common features include ventricular hyperkinesis, potential outflow obstruction, impaired diastolic function, and ischemic phenomena.
- While the exact biological basis remains unknown, adrenergic system and calcium flux abnormalities are implicated in HCM.
Impact:
- Provides a comprehensive overview of HCM's complex presentation and underlying pathology.
- Highlights areas requiring further research, such as the mechanisms of outflow obstruction and the precise biological substrate.
- Aids clinicians in recognizing the multifaceted nature of HCM and its potential complications.
Abstract:
The morphological features, mode of presentation and physiopathology of hypertrophic cardiomyopathy (HCM) are variable. Autosomal dominant seems to be the usual mode of transmission but with variable presentation. From the anatomical point of view, the hypertrophy is asymmetrical with septal predominance. The main histological features are myocytic architectural disorganisation, fibrosis and abnormal coronary arteries of small diameter. Ventricular hyperkinesis is usually present and sometimes associated with outflow obstruction, the physiological role and mechanisms of which are still not fully understood. On the other hand, abnormal diastolic function is frequently observed, and, quite independently of disease of the epicardial coronary arteries, ischaemic phenomena may occur. Although the biological substrate of HCM is unknown, abnormalities of the adrenergic system and transmembrane calcium flux probably play a part in the expression of the disease.