1 MCQs in Medicine for NEET PG
A 72-year-old man with chronic atrial fibrillation on digoxin presents with palpitations, nausea, and visual disturbances (yellow-green halos). ECG shows a wide-complex tachycardia with beat-to-beat alternation of the QRS axis between approximately +120° and −60°. The rhythm marked **B** in the diagram is identified. His serum potassium is 3.2 mEq/L and serum creatinine is 2.1 mg/dL. Which of the following is the PRIMARY mechanism underlying the arrhythmia marked **B**?
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