A 74-year-old man with ischemic cardiomyopathy and chronic a…
A 74-year-old man with ischemic cardiomyopathy and chronic atrial fibrillation presents to clinic with complaints of fatigue, anorexia, and intermittent visual blurring. He takes digoxin, furosemide, lisinopril, and warfarin. Exam: HR 48 bpm, irregular; BP 102/60 mmHg. Labs: K⁺ = 2.7 mEq/L, Cr = 1.0 mg/dL. Which medication combination most likely precipitated this presentation?