A 39-Year-Old Woman Who Recently Underwent Thyroidectomy for Grave's Disease

A 39-year-old woman who recently underwent thyroidectomy for Grave's disease complains of anxiety, muscle cramps, and poor sleep.  Her medications include daily multivitamin supplements and lansoprazole for acid reflux disease.  Her temperature is 36.6 C (98 F) , blood pressure is 142/85 mm Hg, and pulse is 82/min.  Electrocardiogram shows normal sinus rhythm with prolongation of the corrected QT interval to 510 msec (normal <460 msec) .  Which of the following is the most likely diagnosis?

A) Hyperkalemia
B) Hypocalcemia
C) Hyponatremia
D) Persistent hyperthyroidism
E) Vitamin D toxicity

Correct Answer:

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