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Hypertrophic cardiomyopathy evolving into a hypokinetic and dilated left ventricle: coronary embolization as a
M B Gravanis1, P H Robinson, G L Hertzler
1Department of Pathology, Emory University School of Medicine, Atlanta, GA 30322.
Insights
Hypertrophic cardiomyopathy can progress to a dilated heart over time. This case study shows myocardial scars and thrombi in a heart transplant patient, offering insights into disease progression.
Area of Science:
- Cardiology
- Pathology
- Cardiovascular Research
Background:
- Hypertrophic cardiomyopathy (HCM) is a primary cardiac disease characterized by left ventricular hypertrophy.
- The natural history of HCM can involve progression to dilated cardiomyopathy (DCM) in some cases.
- Understanding the transition from HCM to DCM is crucial for patient management and therapeutic development.
Observation:
- A nine-year follow-up of an HCM patient revealed a transition to a hypokinetic and dilated left ventricle.
- Morphologic studies of the explanted native heart post-transplantation were performed.
- The native heart displayed hallmarks of both HCM and left ventricular dilatation.
Findings:
- Histopathological examination confirmed the presence of hypertrophic cardiomyopathy stigmata.
- Evidence of left ventricular dilatation was observed.
- Multiple myocardial scars in both ventricles suggested prior ischemic events, likely from coronary embolization secondary to left ventricular mural thrombi.
Implications:
- This case highlights a potential, albeit rare, progression pathway for hypertrophic cardiomyopathy.
- Coronary embolization from mural thrombi is proposed as a significant pathogenetic mechanism.
- Further research into the mechanisms driving HCM to DCM transition is warranted.
Abstract:
A long-term follow-up (9 years) in a patient with hypertrophic cardiomyopathy revealed an evolution to a hypokinetic and dilated left ventricle. The patient underwent heart transplantation, and therefore the native heart was available for morphologic studies. Gross and microscopic stigmata of hypertrophic cardiomyopathy were present, as well as evidence of left ventricular dilatation. Multiple myocardial scars in both ventricles indicated past ischemic episodes, most probably due to coronary embolization from left ventricular mural thrombi. Other possible pathogenetic mechanisms for the progression of hypertrophic cardiomyopathy to a dilated one are discussed.