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Evolution of dilated cardiomyopathy from hypertrophic obstructive cardiomyopathy in a child
Insights
Hypertrophic cardiomyopathy (HCM) can rarely progress to dilated cardiomyopathy (DCM) in children. Periodic reevaluation is crucial for pediatric HCM patients to monitor disease progression.
Area of Science:
- Pediatric Cardiology
- Cardiovascular Diseases
- Genetic Cardiomyopathies
Background:
- Hypertrophic cardiomyopathy (HCM) and dilated cardiomyopathy (DCM) are distinct cardiac conditions with different causes.
- HCM is uncommon in children and typically does not evolve into DCM.
Observation:
- A 5-year-old Taiwanese girl was diagnosed with hypertrophic obstructive cardiomyopathy (HOCM).
- Diagnostic methods included echocardiograms, cardiac catheterization, and endomyocardial biopsy.
- The patient's condition transitioned to nonobstructive HCM by age 9, followed by dilated cardiomyopathy with severe contractile dysfunction and heart failure at age 10.
Findings:
- The case demonstrates an unusual progression of hypertrophic cardiomyopathy to dilated cardiomyopathy in a pediatric patient.
- The patient experienced intractable congestive heart failure and ventricular tachycardia.
- Death occurred at age 13 due to ventricular tachycardia.
Implications:
- This case highlights the importance of regular clinical and echocardiographic reassessment in children diagnosed with HCM.
- Early detection of evolving phenotypes may allow for timely intervention and management adjustments.
- Understanding rare disease trajectories in pediatric cardiomyopathy is essential for improving patient outcomes.
Abstract:
Hypertrophic cardiomyopathy (HCM) and dilated cardiomyopathy (DCM) are two different diseases and have distinct etiologies. HCM is rare in children and rarely progresses to DCM. We report a 5-year-old Taiwanese girl with a definite diagnosis of hypertrophic obstructive cardiomyopathy. The diagnosis was based on echocardiograms, cardiac catheterization, and endomyocardial biopsy. However, the clinical features progressed to a picture of nonobstructive HCM at age 9, and the patient developed dilated poorly contractile ventricles with intractable congestive heart failure at age 10. She died from ventricular tachycardia at age 13. This report emphasizes the importance of periodic reevaluation for children with HCM.