A 72-year-old man with heart failure on digoxin presents with nausea, yellow-green visual halos, and bradycardia. ECG shows second-degree heart block. Serum digoxin level is 3.4 ng/mL. What is the most appropriate intervention?
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A
Activated charcoal via nasogastric tube
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B
Digoxin-specific antibody fragments (Digibind)
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C
IV calcium gluconate infusion
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D
Temporary transvenous pacemaker placement