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Genetic Counseling and Screening Issues in Familial Dilated Cardiomyopathy
1Division of Cardiology, Department of Medicine, Oregon Health Sciences University, Portland, Oregon, hansone@ohsu.edu.
Journal of Genetic Counseling
|July 5, 2015
Summary
Genetic factors are increasingly recognized in idiopathic dilated cardiomyopathy (IDC). Screening relatives of affected individuals is crucial for early detection and management of familial dilated cardiomyopathy (FDC).
Area of Science:
- Cardiology
- Genetics
- Medical Diagnostics
Background:
- Idiopathic dilated cardiomyopathy (IDC) is a condition of unknown cause, characterized by left ventricular enlargement and impaired contraction.
- Genetic factors are now understood to play a significant role, with familial dilated cardiomyopathy (FDC) potentially accounting for 30-50% of IDC cases.
- Early detection and intervention are possible through screening, but interpretation of results and genetic complexity pose challenges.
Purpose of the Study:
- To highlight the genetic basis of IDC and FDC.
- To emphasize the importance of screening first-degree relatives.
- To underscore the complexities and need for genetic counseling in FDC.
Main Methods:
- Review of current understanding of genetic etiologies in IDC and FDC.
- Discussion of screening protocols (echocardiography, ECG) for relatives.
- Analysis of challenges in genetic counseling due to incomplete penetrance, variable expression, and genetic heterogeneity.
Main Results:
- A significant proportion of IDC cases are familial (30-50%).
- Screening of relatives can lead to early diagnosis and treatment.
- Genetic counseling for FDC is complex due to its variable nature.
Conclusions:
- Genetic counseling, involving collaboration between cardiologists and geneticists, is essential for managing FDC.
- Improved recognition of FDC and support services can enhance patient and family outcomes.
- Genetic insights into IDC are transforming diagnostic and therapeutic approaches.
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