1 MCQs in Medicine for NEET PG
A 68-year-old man with hypertension presents to the emergency department with syncope. ECG shows the pattern marked **A** — regular P waves at 90 bpm marching independently through QRS complexes at 45 bpm, with narrow QRS duration of 100 ms. Physical examination reveals cannon a waves on jugular venous pulsation. Which of the following statements best characterizes the anatomic level and acute management of this conduction disturbance?
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