A patient who is paraplegic secondary to spinal cord transection at T3 develops bradycardia and facial flushing during a nephrectomy under general anesthesia with nitrous oxide, fentanyl, and atracurium. The most likely cause of this response is
A 65-year-old man is disoriented and has a headache and nausea in the recovery room 30 minutes after transurethral resection of the prostate with glycine irrigation performed under spinal anesthesia. Heart rate is 50 bpm and blood pressure is 180/110 mmHg. Which of the following is LEAST likely?
Thirty-six hours after primary repair of meningomyelocele, a term newborn has frequent periods of apnea lasting 25 seconds and associated with oxygen desaturation to 80%. The most likely explanation is
A patient whose trachea is intubated develops partial airway obstruction two hours after induction of fentanyl, nitrous oxide, oxygen anesthesia. The anesthesiologist discontinues the nitrous oxide and controls ventilation, and there is gradual improvement during the next hour. No evidence of a respiratory disorder is found at the conclusion of the anesthetic. Which of the following is most likely?
(A) The endotracheal tube was in the right mainstem bronchus
(B) The patient had an unrecognized air embolism
(C) The patient had a nitrous oxide pneumothorax
(D) The endotracheal tube cuff narrowed the airway
Alveolar partial pressure of an inhaled anesthetic rises more rapidly in a parturient at term than in a nonpregnant woman because
(A) functional residual capacity is decreased
(B) PaC02 is decreased
(C) uptake of inhaled agents by tissues is decreased
(D) cardiac output is increased
(E) physiologic dead space is increased
A
A 70-year-old patient has absence of the left radial pulse one month after repair of an aortic aneurysm. Arterial pressure was monitored perioperatively with a 20-gauge left radial artery catheter. Which of the following statements concerning this complication is true?
(A) A preoperative Allen's test would have predicted this complication
(B) Stellate ganglion block should be performed
(C) This complication would have been less likely with an 18-gauge catheter
(D) This patient has poor collateral circulation in the hand