A 35-year-old woman receiving isoflurane anesthesia suddenly develops tachycardia, hypertension, and multifocal ventricular ectopy during dissection of a pheochromocytoma. Each of the following would be appropriate treatment EXCEPT
(A) administration of an alpha-adrenergic blocker
(B) administration of a beta-adrenergic blocker
(C) administration of lidocaine
(D) administration of nitroprusside
(E) switching from isoflurane to enflurane
E
An obese, 75-year-old woman is scheduled for open reduction of a left forearm fracture. Thirty minutes after successful interscalene block using 20 ml of 2% lidocaine, she becomes dyspneic. The dyspnea is most likely related to
A 6-year-old boy undergoes craniotomy in the supine position for brain tumor during anesthesia with 1.5% isoflurane in oxygen. PetCO2 is 38 mmHg, heart rate is 78 bpm, and blood pressure is 130/80 mmHg. After opening the dura, the surgeon notes that the brain is bulging. Which of the following management options is LEAST likely to significantly decrease brain size?
An intubated patient is breathing spontaneously through the T-piece shown in Figure 1. Addition of tubing at A and B as shown in Figure 2 without an increase in minute ventilation will result in
(A) unchanged FiO2 and increased PaCO2
(B) unchanged FiO2 and unchanged PaCO2
(C) increased FiO2 and increased PaCO2
(D) increased FiO2 and unchanged PaCO2
(E) decreased FiO2 and increased PaCO2
C
The acute onset of hypotension without a decrease in mixed venous oxygen saturation is most likely associated with the onset of
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