A 20-year-old patient undergoes a thoracic vertebral stabilization procedure six hours after sustaining an acute transection of the spinal cord at T4. The risks of general anesthesia are greater in this patient than in a patient with an intact spinal cord because of
Following a vaginal hysterectomy in the lithotomy position under general anesthesia, a patient has numbness of the lateral aspect of the left calf and medial half of the dorsum of the left foot. On physical examination she has footdrop and the toes cannot be extended. Which nerve is most likely to be involved?
A 50-year-old patient is undergoing craniotomy for clipping of a cerebral aneurysm with isoflurane, nitrous oxide, and fentanyl anesthesia. At the time of aneurysm exposure, the EEG shows burst suppression. Which of the following is the most likely cause?
With long-term administration, which of the following drugs produces the most prolonged sedative effect of diazepam?
A 40-year-old patient has pain following injection of 8 ml of thiopental 2.5% through a right radial artery catheter. His hand remains pink. Which of the following is the most appropriate next step?
A 75-year-old woman with significant carotid artery stenosis is scheduled for general anesthesia for repair of a fractured hip. Which of the following is the greatest disadvantage of using propofol as an induction agent in this patient?
A patient is in sinus rhythm but has no pulse during cardiopulmonary resuscitation. There is marked resistance to positive pressure ventilation and breath sounds are difficult to hear bilaterally. The endotracheal tube is clearly in the trachea. The most appropriate next step in management is to
Systemic hypothermia to 30°C is accompanied by
A 70-kg, 77-year-old man Is undergoing left nephrectomy with nitrous oxide, oxygen, fentanyl, and midazolam anesthesia. He has a 90 pack-year history of cigarette smoking and has chronic obstructive pulmonary disease. One hour after incision, expiratory wheezing occurs and peak Inspiratory pressure increases from 35 to 65 cmH20; end-tidal PCO2 is unchanged, but SpO2 decreases from 97% to 88%. The most likely cause is
Which of the following provides the most definitive diagnosis in a patient with suspected brain death?