Six months after repair of a lacerated peroneal nerve, a patient has electric-shock-like pain when pressure is applied to the middle of the gastrocnemius muscle. The most appropriate initial management is
A patient undergoes differential spinal block for evaluation of persistent foot pain. If the pain returns coincident with a decrease in skin temperature, which of the following is the most appropriate conclusion?
The ECG rhythm shown developed during cholecystectomy in a 62-year-old man who had a myocardial infarction and is taking atenolol. The drug of choice for treating this dysrhythmia is
(A) atropine
(B) bretylium
(C) isoproterenol
(D) lidocaine
(E) procainamide
A
A 55-year-old man is undergoing craniotomy in the sitting position. Mean arterial pressure is 75 mmHg; arterial blood gas values are PaCO2 41 mmHg and pH 7.37. End-tidal CO2 is 7 mmHg. Which of the following is the most likely cause of the increased PaCO2 to PetCO2 gradient?
(A) Decreased cardiac output
(B) Endobronchial intubation
(C) Hyperinflation of the lungs
(D) Partial disconnect of the capnograph sample tubing
A 62-year-old man is scheduled for coronary artery bypass grafting. During induction of anesthesia with fentanyl, high peak inspiratory pressures occur with manual ventilation, and peripheral oxygen saturation decreases from 100% to 94%. The most appropriate management is administration of
A 25-year-old woman undergoes a difficult open cholecystectomy during anesthesia with isoflurane, nitrous oxide, fentanyl, and vecuronium. Five units of blood are administered intraoperatively. Two days later, the patient has mildly increased serum transaminase concentrations and markedly increased alkaline phosphatase and direct bilirubin concentrations. Which of the following is the most likely cause?