A 40-year-old woman presents with palpitations. Her ECG shows a regular narrow complex tachycardia at 180 bpm with no visible P waves. After administration of adenosine, the rhythm converts to normal sinus rhythm. What is the most likely diagnosis?
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✓ Correct answer: C. AV nodal reentrant tachycardia (AVNRT)A regular narrow complex tachycardia that responds to adenosine is most consistent with AV nodal reentrant tachycardia (AVNRT). This is a type of supraventricular tachycardia that uses the AV node for reentry and is commonly seen in young to middle-aged adults without structural heart disease.
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