Cardiomyopathic and channelopathic causes of sudden unexplained death in infants and children

Area of Science:

• Cardiology
• Genetics
• Pediatrics

Background:

• Increasing awareness of heritable cardiomyopathic and channelopathic syndromes linked to sudden cardiac death in children.
• These conditions are significant causes of sudden cardiac death (SCD) in infants and children.

Purpose of the Study:

• To review clinical and molecular findings of specific cardiac abnormalities and channelopathies.
• To explore the role of molecular autopsy in sudden unexplained deaths (SUDs) and analyze channelopathies in sudden infant death syndrome (SIDS).

Main Methods:

• Review of current clinical and molecular findings.
• Analysis of autopsy-evident structural cardiac abnormalities and cardiac channelopathies.
• Exploration of postmortem genetic analysis and genetic testing.

Main Results:

• Hypertrophic cardiomyopathy and arrhythmogenic right ventricular cardiomyopathy are key structural abnormalities.
• Long QT syndrome, catecholaminergic polymorphic ventricular tachycardia, Brugada syndrome, and short QT syndrome are significant channelopathies.
• These channelopathies may explain up to one-third of autopsy-negative SUDs in children and adolescents.

Conclusions:

• Heritable cardiac disorders are critical considerations in pediatric sudden cardiac death.
• Molecular autopsy is valuable for diagnosing SUDs.
• Genetic testing is essential for identifying and managing these potentially lethal cardiac conditions.