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Hypertrophic cardiomyopathy in identical twins
J M Reid1, A B Houston, E Lundmark
1Department of Cardiology, Western Infirmary, Glasgow.
British Heart Journal
|November 1, 1989
Summary
Identical twins with hypertrophic cardiomyopathy showed different disease progression. One required surgery for left ventricular outflow tract obstruction, while the other remained asymptomatic.
Area of Science:
- Cardiology
- Genetics
- Pediatrics
Background:
- Hypertrophic cardiomyopathy (HCM) is a genetic heart muscle disease.
- Identical twins share the same genetic makeup, offering a unique model for studying disease variability.
Observation:
- Two identical twin boys were diagnosed with hypertrophic cardiomyopathy in early childhood.
- One twin developed severe symptoms and significant left ventricular outflow tract obstruction by age 12, necessitating myomectomy.
- The other twin remained asymptomatic with no observable outflow tract obstruction.
Findings:
- Despite identical genetics, significant clinicalDiscordance in hypertrophic cardiomyopathy progression was observed.
- Surgical intervention (myomectomy) in one twin at age 12 did not fully restore function, with moderate incapacitation persisting at age 19.
- The untreated twin maintained a relatively normal life, highlighting potential genetic or environmental modifiers.
Implications:
- This case underscores the complex and variable clinical manifestations of hypertrophic cardiomyopathy, even in genetically identical individuals.
- Further research into factors influencing disease severity and progression in HCM is warranted.
- Understanding these differences could lead to personalized treatment strategies for hypertrophic cardiomyopathy.