Review Question - QID 210989

A 37-year-old woman accompanied by her husband presents to the emergency department after loss of consciousness 30 minutes ago. The husband reports that she was sitting in a chair at home and began having sustained rhythmic contractions of all 4 extremities for approximately 1 minute. During transport via ambulance she appeared confused but arousable. Her husband reports she has no medical conditions, but for the past 2 months she has occasionally complained of episodes of sweating, palpitations, and anxiety. Her brother has epilepsy and her mother has type 1 diabetes mellitus. Laboratory studies obtained in the emergency department demonstrate the following:

Serum:
Na+: 136 mEq/L
K+: 3.8 mEq/L
Cl-: 100 mEq/L
HCO3-: 19 mEq/L
BUN: 16 mg/dL
Creatinine: 0.9 mg/dL
Glucose: 54 mg/dL
C-peptide: Low

Which of the following is the most likely diagnosis?