Brugada Syndrome

Brugada Syndrome is a heart condition that affects the electrical system controlling the heartbeat. It primarily involves the heart's rhythm, causing abnormal electrical signals that can lead to dangerous irregular heartbeats called arrhythmias. These arrhythmias can cause symptoms like fainting or sudden cardiac arrest, especially during sleep or rest. The condition is usually inherited and affects the heart's ventricles, the lower chambers responsible for pumping blood. Diagnosis often involves an electrocardiogram (ECG) to detect characteristic changes. Understanding this condition is important because it can lead to sudden death in otherwise healthy individuals.

Brugada Syndrome is a genetic disorder characterized by abnormal cardiac electrical activity due to mutations most commonly in the SCN5A gene, which encodes the cardiac sodium channel. This leads to a loss of function in the fast sodium current (INa), causing altered action potential propagation in the right ventricular outflow tract. The syndrome manifests as a distinctive ECG pattern with coved-type ST-segment elevation in the right precordial leads (V1-V3) and predisposes affected individuals to ventricular tachyarrhythmias and sudden cardiac death. It is an important cause of sudden unexplained death in young adults without structural heart disease. The condition is inherited in an autosomal dominant pattern with variable penetrance. Clinical significance lies in its potential to cause fatal arrhythmias, often triggered by fever, certain medications, or metabolic disturbances.