A 39-year-old patient with insulin-dependent diabetes mellitus receives thiopental 250 mg and succinylcholine 80 mg and is ventilated with 0.75% isoflurane in oxygen. Arterial pressure decreases abruptly from 140/100 to 80/50 mmHg while heart rate remains unchanged at 70 bpm. Failure of heart rate to increase most likely results from
(A) acute hypoglycemia
(B) autonomic neuropathy
(C) depression of sinus node function by thiopental
(D) depression of the baroreflex response by isoflurane
A 50-year-old man is scheduled to undergo emergency craniotomy for evacuation of an epidural hematoma. His Glasgow Coma Scale score is 6; heart rate is 54 bpm, and blood pressure is 190/110 mmHg. The most appropriate initial management is administration of which of the following agents?
A patient who is scheduled for a parathyroidectomy for a parathyroid adenoma has a preoperative serum calcium concentration of 13.5 mg/dl. The ECG shows no acute changes. The most appropriate preoperative management is administration of
(A) calcitonin
(B) hydrocortisone
(C) intravenous saline solution
(D) mannitol
(E) potassium phosphate
C
Three hours after total thyroidectomy, a 33-year-old man develops inspiratory stridor. The most likely cause is
(A) hematoma formation
(B) tracheomalacia
(C) tetany
(D) recurrent laryngeal nerve injury
(E) superior laryngeal nerve injury
A
The induction dose of thiopental should be decreased in each of the following situations EXCEPT
(A) age greater than 70 years
(B) cardiogenic shock
(C) decreased hepatic blood flow
(D) hypoalbuminemia
(E) hypothyroidism
C
The syndrome of inappropriate ADH secretion is characterized by
(A) ADH secretion unrelated to serum osmolality
(B) decreased ADH secretion in response to hypovolemia