Which of the following statements concerning pressure support ventilation is true?
(A) Continuous positive airway pressure is provided during inspiration and expiration
(B) Delivered tidal volume remains the same with decreasing lung compliance
(C) Inspiratory effort less than -2 cmH20 is not assisted
(D) The overall work of breathing decreases when weaning from mechanical ventilation
(E) The patient will need more sedation than during intermittent mandatory ventilation
D
Recognized side effects of magnesium sulfate used for the treatment of preeclampsia that would be of anesthetic concern include each of the following EXCEPT
(A) maternal pulmonary edema
(B) neonatal hypotonia
(C) increased maternal sensitivity to succinylcholine
A 24-year-old man is undergoing induction of general anesthesia prior to appendectomy. During laryngoscopy, he regurgitates a large amount of bilious material. An endotracheal tube is inserted; aspiration shows bile-stained fluid. Which of the following is the most appropriate next step in management?
(A) Infusion of a loading dose of aminophylline
(B) Intravenous administration of broad-spectrum antibiotics
(C) Lavage of the tracheobronchial tree with saline solution
(D) Radiograph of the chest
(E) Proceeding with the operation
E
Which of the following perioperative interventions decreases the risk for renal insufficiency in patients undergoing aortic aneurysm repair?
Which of the following statements concerning carbon monoxide poisoning is true? A 38-year-old woman with a large goiter has undergone subtotal thyroidectomy. Airway obstruction is noted immediately after extubation despite normal vocal cord function on laryngoscopy. Which of the following is the most likely explanation?
A 68-year-old woman is scheduled for a mastectomy. She has not taken prescription medications for 24 hours. Preoperative examination shows a heart rate of 104 bpm and blood pressure of 200/105 mmHg. The most likely cause of these findings is omission of which of the following drugs?
(A) Amiodarone
(B) Clonidine
(C) Enalapril
(D) Hydralazine
(E) Nifedipine
B
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?