Persistent generalized weakness and decreased oral intake bring a man in his early 60s with hx of thyroid cancer to the ED. Do ECG and labs suggest a diagnosis?
Patient history: A man in his early 60s with a history of thyroid cancer and a recent admission presents to the hospital for 4 days of generalized weakness and decreased oral intake. He denies any pain, palpitations, vomiting, diarrhea, focal weakness, syncope, trauma or other complaints.
Vital signs and physical examination: Vital signs are normal except for a soft blood pressure of 102/52 mm Hg and a pulse of 118 beats/min. Initial physical exam is otherwise normal except for dry mouth.
Initial diagnostic testing: