Maternal hyperventilation to a PaCO2 of 20 mmHg during labor can result in
A patient is undergoing thoracotomy in the lateral position. Five minutes after initiation of one-lung ventilation using a double-lumen tube and 100% oxygen, SpO2 decreases from 100% to 65%. Which of the following is the most appropriate initial step in management?
A 72-year-old patient who takes levodopa and carbidopa is undergoing colon resection. Metoclopramide is administered preoperatively and anesthesia is maintained with proposal, fentanyl, and nitrous oxide, with vecuronium for muscle relaxation. Fifteen minutes after reversal of muscle relaxation with neostigmine and atropine and tracheal extubation, the patient has dyspnea and muscular rigidity. Which of the following is the most likely cause?
Two days after coronary artery bypass grafting, a 62-year-old man remains sedated, tracheally intubated, and mechanically ventilated with full neuromuscular block. Over the next three hours, Pa02 decreases from 90 to 70 mmHg at an Fl02 of 0.7, peak inspiratory pressure measured proximally in the ventilatory circuit increases from 40 to 66 cmH20, and plateau pressure remains unchanged at 30 cmH20. Which of the following is the most likely cause of these changes?
A patient is undergoing exploration of a stab wound to the left side of the neck. On awake laryngoscopy, the left vocal cord is in midposition and the right vocal cord is abducted during inspiration. The most likely cause of these findings is trauma to which of the following structures on the left?
A 52-year-old man develops oliguria 24 hours after left hemicolectomy. Urinalysis shows a specific gravity of 1.028, an osmolality of 650 mOsm/L, and a sodium concentration of 10 mEq/L. Which of the following is the most likely diagnosis?
A 25-year-old man with Wolff-Parkinson-White syndrome has paroxysmal supraventricular tachycardia with a heart rate of 200 bpm during insertion of an intramedullary rod for a femoral fracture. Duration of the QRS complex is 0.12 sec. Each of the following antidysrhythmic agents would be appropriate for use in this patient EXCEPT
Which of the following pre-existing conditions predisposes to new-onset third-degree heart block during pulmonary artery catheterization?
A 35-year-old woman receiving isoflurane anesthesia suddenly develops tachycardia, hypertension, and multifocal ventricular ectopy during dissection of a pheochromocytoma. Each of the following would be appropriate treatment EXCEPT
A pulmonary artery catheter is placed in an awake patient breathing room air. Typical right ventricular and pulmonary artery pressure tracings are obtained. With the catheter balloon inflated, blood drawn from the distal port has a PaO2 of 100 mmHg, while a simultaneous radial artery sample has a PaO2 of 90 mmHg. These data indicate that the