13. B is the correct answer. These EKG changes are consistent with digoxin toxicity. With digoxin toxicity many changes can occur: ST depression and T wave inversion in V5 and V6 in a reversed tick pattern, prolonger PR interval, shortened QT, heart block, and bigeminy. This patient has no delta waves. The P waves and the QRS complex are not dissociated so the patient does not have a third degree block.
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