Which of the following statements concerning opioid dependence in anesthesiologists is true?
(A) Mortality rate is high
(B) Deterioration of professional performance is an early sign
(C) Nalbuphine suppresses signs of withdrawal
(D) Naltrexone prevents relapse
(E) Sufentanil is detected by urine screening
A
A 55-year-old man who is scheduled to undergo carotid endarterectomy (CEA) has a persistent myocardial filling defect at three hours on a dipyridamole-thallium scan. Which of the following statements is correct?
(A) Coronary autoregulation is effective in this segment
A 60-kg, 45-year-old woman who takes digoxin for atrial fibrillation receives furosemide 40 mg and mannitol 60 g during resection of a supratentorial meningioma. After initiation of hyperventilation to decrease PaC02 from 35 to 20 mmHg, multifocal premature ventricular contractions are noted on the ECG. The most likely cause is
(A) acute hypokalemia
(B) cerebral ischemia
(C) impending herniation of the brain stem
(D) paradoxical air embolism
(E) surgical manipulation of the meningioma
A
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
Which of the following phenomena is primarily responsible for the decrease in core body temperature that commonly occurs during the first hour of general anesthesia?
(A) Convective heat loss from cutaneous vasodilation
(B) Decreased heat production
(C) Evaporative heat loss during skin preparation
(D) Heat loss from the respiratory tract
(E) Redistribution of core body heat to the periphery
A 60-kg 25-year-old woman is undergoing laparoscopy in the Trendelenburg position during general anesthesia. Five minutes after peritoneal inflation, the peak airway pressure required to deliver a tidal volume of 800 ml increases from 25 cmH2O to 60 cmH2O. SpO2 decreases from 100% to 80% and systolic blood pressure increases from 110 mmHg to 140 mmHg. Which of the following is the most likely cause?