An obese patient with Addison’s disease is admitted to the ED after ambulatory surgery. The paramedics report that the patient has a fever, pallor, rapid weak pulse, signs of dehydration, headache, confusion, restlessness, and a blood pressure of 90/50 mmHg. Laboratory findings reveal a serum potassium level of 6.5 mEq/L, white blood cell count, 15,000/mm3 serum glucose level 55 mg/dL, and serum sodium level 124 mEq/L. The physician diagnoses adrenal crisis. The nurse suspects that this patient’s adrenal crisis probably resulted from: