Which of the following would be most likely to increase the duration of seizures during electroconvulsive therapy using a barbiturate and succinyleholine for general anesthesia?
(A) Administration of atropine prior to therapy
(B) Changing to a benzodiazepine for induction
(C) Changing to etomidate for induction
(D) Adding phenytoin to preoperative medications
(E) Decreasing the dose of barbiturate used for induction
A patient has a seizure within seconds after receiving a retrobulbar injection of 0.5% bupivacaine with epinephrine 1:200,000. Which of the following is the most likely cause?
Two days after myocardial infarction involving the left anterior descending coronary artery, a patient's blood pressure decreases acutely from 125/80 to 70/40 mmHg, heart rate increases from 75 to 90 bpm, pulmonary artery pressure increases to 50/30 mmHg, and urine output decreases from 60 to 10 ml/hr. Thermodilution cardiac output has increased from 4 to 7 L/min. The most appropriate action is to
(A) compare mixed venous oxygen saturation in the right atrium and pulmonary artery
(B) draw blood for culture and start antibiotic therapy
(C) start dopamine infusion in low dose
(D) administer a fluid challenge
(E) monitor peripheral capillary oxygenation by transcutaneous oximetry
A 70-year-old man who underwent bilateral carotid endarterectomies two years ago is to undergo anesthesia and surgery. The denervation of the carotid bodies is likely to result in