A 7-year-old boy presents with recurrent syncope during swimming. His resting ECG is normal. Which of the following is the most likely diagnosis?
- A Brugada syndrome
- B Long QT syndrome type 1 ✓
- C Arrhythmogenic right ventricular cardiomyopathy
- D Catecholaminergic polymorphic ventricular tachycardia
Correct answer: B. Long QT syndrome type 1
Explanation
Syncope during swimming is classically associated with long QT syndrome type 1 (LQT1), which is triggered by sympathetic stimulation during exertion and particularly by swimming. Catecholaminergic polymorphic VT is triggered by exercise but not specifically by swimming. Brugada syndrome typically causes events during rest, sleep, or fever. ARVC causes exertional syncope but has no specific association with swimming.
Reference: Nelson Textbook of Pediatrics, 21st ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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