A 20-year-old man is scheduled for emergency laparotomy for an abdominal stab wound. Ten minutes after induction with oxygen, thiopental, and succinylcholine, blood pressure is 220/120 mmHg and esophageal temperature is 39°C. ST-segment depression of 4 mm is noted in ECG lead V5. Which of the following is the most likely cause?
(A) Adrenal laceration
(B) Cocaine intoxication
(C) Inadequate anesthesia
(D) Malignant hyperthermia
(E) Small cardiac puncture
B
A 157 cm (5 ft 2 in), 180-kg, 40-year-old woman has a PaO2 of 65 mmHg, a PaCO2 of 38 mmHg, and a pH of 7.43 while breathing room air preoperatively. The most likely cause of these values is
(A) decreased hypoxic ventilatory drive
(B) higher than normal oxygen extraction from blood
(C) lower than normal cardiac output
(D) lower than normal functional residual capacity
A 62-year-old man, who had a myocardial infarction three years ago, complicated by congestive heart failure and renal failure, is undergoing a colectomy. A pulmonary artery catheter demonstrates a cardiac output higher than measurements recorded during a cardiac catheterization two months after the infarction. Which of the following most likely contributes to the increased cardiac output?
(A) Creation of an arteriovenous fistula
(B) Increased hemoglobin concentration from 10 to 12 g/dL
(C) Stimulation of carotid body receptors
(D) Transcutaneous nitroglycerin
(E) Use of a beta-adrenergic blocker to prevent myocardial reinfarction
A
Bronchospasm occurring during anesthesia in a patient with an ileal carcinoid is best treated by administration of