Following completion of an ankle block, the patient reports intact sensation on the tips of the toes. Which of the following nerves was blocked inadequately?
A 21-year-old athlete has laryngospasm following extubation after undergoing repair of an inguinal hernia during general anesthesia. Bag and mask ventilation relieves the patient's symptoms. In the PACU 15 minutes later, he has dyspnea; Sp02 is 85% at an Fl02 of .40. Which of the following is the most likely cause?
A 63-year-old man with a history of congestive heart failure and left ventricular dilation is scheduled for carotid endarterectomy. During carotid cross-clamping, the surgeon requests that systolic blood pressure be increased from 100 to 160 mmHg. Compared with an identical patient with normal left ventricular size, what is the effect of this change in blood pressure on this patient's myocardial oxygen consumption?
Halothane anesthesia is usually associated with an increase in
A 68-year-old man has a permanent DVI pacemaker that has been functioning appropriately. Which of the following is most likely to cause conversion to VOO pacing?
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 16-year-old girl is receiving isoflurane, nitrous oxide, oxygen, and pancuronium for insertion of a Harrington rod. In order to perform a "wake-up test" the muscle relaxant was antagonized with neostigmine 2.5 mg and atropine 1 mg. The patient abruptly moved all extremities and was given thiopental 100 mg and succinylcholine 100 mg rapidly. Forty-five minutes later no twitch could be elicited with a nerve stimulator. The most likely explanation is
A patient has a decrease in heart rate from 80 to 50 bpm and a decrease in blood pressure from 140/90 to 60/40 mmHg while in the recovery room after adrenalectomy for pheochromocytoma. The most appropriate treatment is administration of
A 40-year-old woman with Graves' disease is undergoing thyroidectomy with 1% isoflurane, 60% nitrous oxide, and oxygen. During surgical manipulation of the thyroid, temperature increases to 38.5°C, heart rate to 160 bpm, and blood pressure to 150/100 mmHg. The most appropriate initial treatment is to
During isoflurane anesthesia, a 45-year-old patient with chronic asthma has wheezing, prolonged expiration, sinus tachycardia of 120 bpm, and premature ventricular contractions. Preoperative medication included cromolyn and theophylline (serum level 20 jag/ml). The most appropriate treatment is to administer