1 MCQs in Medicine for NEET PG
A 28-year-old woman with congenital long QT syndrome (LQT2) presents to the emergency department with palpitations and syncope during an emotional conversation. ECG shows a baseline QTc of 520 ms. During monitoring, she develops the arrhythmia marked **B** in the diagram — a polymorphic ventricular tachycardia with continuously changing QRS axis twisting around the isoelectric baseline. She is hemodynamically stable. Which of the following is the most appropriate immediate pharmacological intervention?
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