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[Presymptomatic screening after a sudden cardiac death in the family]
A A Wilde1, I M van Langen, J P van Tintelen
1Academisch Medisch Centrum, Amsterdam. a.a.wilde@amc.uva.nl
Insights
Hereditary heart diseases can cause sudden cardiac death. Family history and genetic testing can identify at-risk individuals for early, multidisciplinary intervention and prophylactic treatment.
Area of Science:
- Cardiology
- Genetics
- Molecular Biology
Context:
- Sudden cardiac death (SCD) without ischemic heart disease often suggests an underlying hereditary cardiac condition.
- Autosomal dominant inheritance patterns are common in these genetic cardiomyopathies.
- Family history of SCD is a critical risk factor for relatives.
Purpose:
- To highlight the role of cardiological and genetic investigations in identifying asymptomatic carriers of hereditary heart disease.
- To discuss the identification of specific gene mutations and chromosomal localizations for certain inherited cardiac conditions.
- To emphasize the importance of multidisciplinary approaches in managing hereditary cardiac diseases and preventing SCD.
Summary:
- Hereditary heart diseases, often with autosomal dominant inheritance, are a significant cause of sudden cardiac death (SCD) unrelated to ischemic heart disease.
- Cardiological and genetic evaluations can detect underlying conditions in asymptomatic family members.
- Identified gene mutations allow for targeted prophylactic strategies, including lifestyle modifications, medication, and device implantation.
Impact:
- Early identification and intervention in families with hereditary cardiac conditions can reduce SCD incidence.
- Genetic screening provides crucial information for risk stratification and personalized management plans.
- Understanding the genetic basis of these diseases facilitates the development of novel therapeutic targets and preventative measures.
Abstract:
Sudden cardiac death without ischaemic heart disease may be due to a hereditary heart disease with an autosomal dominant heredity. The occurrence, if any, of sudden death in such a family is a main indicator for the risk of sudden cardiac death in other family members. Cardiological and/or genetic investigation may reveal a hereditary disease in relatives without symptoms. Of some of these pathological conditions, the corresponding chromosomal localizations and sometimes the gene mutations have been identified. The psychic burden of family investigation and the socio-economic consequences (insurances, occupation, family relationships) are potentially heavy. Prophylactic treatment of asymptomatic persons in whom a gene mutation is established may comprise advice about lifestyle (e.g. avoidance of peak exercise in patients with hypertrophic cardiomyopathy), medication (e.g. beta-receptor blockers in patients with a long QT interval) or implantation of a pacemaker or internal defibrillator (e.g. in asymptomatic persons with the Brugada syndrome, a form of right bundle branch block). Presymptomatic investigation must be performed multidisciplinary.