A 12-year-old boy presents with syncope during soccer practice. Vital signs show BP 110/68 mmHg, HR 82 bpm, RR 16/min, temperature 37°C, and SpO2 98% on room air. Resting ECG and transthoracic echocardiography are normal. Exercise stress testing induces bidirectional and polymorphic ventricular tachycardia with exercise cessation terminating arrhythmias. Serum electrolytes including potassium and magnesium are normal. Which of the following is the most likely diagnosis?
- A)Atrial flutter
- B)Long QT syndrome
- C)Brugada syndrome
- D)AV nodal reentrant tachycardia
- E)Catecholaminergic polymorphic ventricular tachycardiaGABARITO
Explicação
Exercise or emotional stress provoking bidirectional or polymorphic ventricular tachycardia with a normal resting ECG strongly suggests catecholaminergic polymorphic VT. It is usually caused by abnormal calcium handling within cardiac myocytes and predisposes ... Ver explicação completa e trilha adaptativa →