A 67-year-old man with new-onset heart failure is seen in the hospital and is started on therapy with an angiotensin-converting enzyme inhibitor, a β-blocker, furosemide, and spironolactone. One week later, he presents with weakness, nausea, and lightheadedness. His blood urea nitrogen and creatinine are significantly elevated to 62/2.8 compared with 24/1.3 at baseline. An ECG is obtained.
What is the diagnosis?
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