A 36-year-old woman presents with sudden onset of flaccid paralysis of all four limbs accompanied by dizziness. Physical examination shows clear consciousness, facial flushing, generalized hyperpigmentation, acne vulgaris, perioral hirsutism, and increased vellus hair growth. There is thickened subcutaneous fat in the chest and abdomen, with 1.0 cm wide purple striae visible on the lower abdomen. Fasting blood glucose (FBG) is 10.2 mmol/L, and urinary 17-hydroxycorticosteroids (17-OHCS) is 58 μmol/24h (21 mg/24h). Which of the following findings is most likely to be observed?