hypokalemia

A 55-year-old male with history of recently diagnosed HFrEF, DM, HTN presents with progressive generalized weakness and intermittent palpitations over the past two weeks that worsened over the past two days when he developed non-bloody, non-bilious vomiting and non-bloody diarrhea. He has been taking his daily medications as prescribed which include metformin, metoprolol, and furosemide. EKG reveals NSR with flattened T waves, prominent U waves, and prolonged QTc.

Dr. Swaminathan and CORE EM bring you a great post on hypokalemia!