Brugada Syndrome is associated with:
**Core Concept**
Brugada Syndrome is a genetic disorder characterized by abnormal electrocardiogram (ECG) findings and an increased risk of sudden cardiac death due to ventricular fibrillation. It is primarily caused by mutations in genes encoding cardiac sodium channels, leading to abnormal sodium channel function and altered action potential duration.
**Why the Correct Answer is Right**
The correct answer is associated with the pathophysiology of Brugada Syndrome, which involves abnormal sodium channel function. The mutations in genes encoding cardiac sodium channels, such as SCN5A, lead to a loss-of-function or gain-of-function in the sodium channel, resulting in a prolonged action potential duration and an increased risk of ventricular fibrillation. This is due to the altered sodium influx during the action potential, which can lead to a depolarization-induced early afterdepolarization, triggering ventricular fibrillation.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it is not directly related to the pathophysiology of Brugada Syndrome. While hypokalemia can lead to QT interval prolongation, it is not a primary cause of Brugada Syndrome.
**Option B:** This option is incorrect as it is not a characteristic feature of Brugada Syndrome. Although patients with Brugada Syndrome may have a history of syncope or cardiac arrest, the characteristic ECG findings are more specific to the condition.
**Option C:** This option is incorrect as it is not a primary cause of Brugada Syndrome. While certain medications, such as quinidine and procainamide, can unmask or worsen Brugada Syndrome, they are not a primary cause of the condition.
**Clinical Pearl / High-Yield Fact**
A key clinical feature of Brugada Syndrome is the characteristic ECG pattern, which includes a coved-type ST-segment elevation in leads V1-V3. This pattern is often accompanied by a right bundle branch block (RBBB) morphology.
**Correct Answer: C. SCN5A gene mutation**