During carotid endarterectomy, blood pressure suddenly decreases from 140/90 to 80/50 mmHg. The EKG shows a heart rate of 42 bpm, with normal sinus rhythm and occasional premature ventricular contractions. The most appropriate therapy is intravenous administration of
(A) atropine
(B) epinephrine
(C) isoproterenol
(D) lidocaine
(E) phenylephrine
A
In patients with pregnancy-induced hypertension, magnesium sulfate is most likely to
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
A 48-year-old woman with von Willebrand's disease is scheduled for a hysterectomy. The most appropriate initial preoperative therapy to decrease bleeding is administration of