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Evaluation After Sudden Death in the Young: A Global Approach
Belinda Gray1,2,3,4, Michael J Ackerman5,6, Christopher Semsarian3,4
1Cardiology Clinical Academic Group, St. George's University of London (B.G., E.R.B.).
Insights
Sudden cardiac death in young individuals (<35 years) is often caused by inherited cardiac conditions. Evaluating families after a young sudden cardiac death is crucial for diagnosing these genetic heart diseases.
Area of Science:
- Cardiology
- Genetics
- Pathology
Background:
- Sudden cardiac death (SCD) is a critical outcome of cardiovascular diseases, frequently unexpected.
- In individuals under 35, unexplained SCD is a common presentation.
- A substantial portion of SCD in the young is linked to inherited cardiac conditions, including cardiomyopathies and inherited arrhythmia syndromes (cardiac channelopathies).
Purpose of the Study:
- To review the causes of sudden cardiac death in the young.
- To outline a systematic approach for familial evaluation after a young person's sudden cardiac death.
Main Methods:
- Literature review on causes of SCD in young individuals.
- Discussion of diagnostic strategies for inherited cardiac conditions.
- Emphasis on the importance of clinical and genetic evaluation of at-risk family members.
Main Results:
- Inherited cardiac conditions are a significant cause of SCD in individuals ≤35 years.
- Sudden death can be the initial clinical manifestation of these genetic disorders within a family.
- Autosomal dominant inheritance patterns are common, conferring a 50% risk to first-degree relatives.
Conclusions:
- Identifying the underlying inherited cardiac condition is vital for preventing future SCD events.
- Familial evaluation is essential for diagnosing genetic heart diseases in at-risk relatives.
- A structured approach to family assessment aids in managing and preventing inherited cardiac conditions.
Abstract:
Sudden cardiac death is defined as a death occurring usually within an hour of onset of symptoms, arising from an underlying cardiac disease. Sudden cardiac death is a complication of a number of cardiovascular diseases and is often unexpected. In individuals aged <35 years, unexplained sudden cardiac death is the most common presentation. A significant proportion of sudden cardiac death in the young (≤35 years) events may be precipitated by underlying inherited cardiac conditions, including both heritable cardiomyopathies and inherited arrhythmia syndromes (also known as cardiac channelopathies). Tragically, sudden death may be the first manifestation of the disease in a family and, therefore, clinical and genetic evaluation of surviving family members forms a key role in diagnosing the underlying inherited cardiac condition in the family. This is particularly relevant when considering that most inherited cardiac conditions are inherited in an autosomal dominant manner meaning that surviving family members have a 50% chance of inheriting the same disease substrate. This review will outline the underlying causes of sudden cardiac death in the young and outline our universal approach to familial evaluation following a young person's sudden death.
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