A 65-year-old woman has respiratory distress and loss of consciousness immediately following superficial and deep cervical plexus block for right carotid endarterectomy. Which of the following is the most likely cause?
During general anesthesia with spontaneous ventilation, a patient has a VD/VT of 0.5. Which of the following is most likely to decrease the ratio?
A patient receiving mechanical ventilation with oxygen 60% postoperatively has a PaO2 of 160 mmHg and a PaCO2 of 38 mmHg. One hour later, with mechanical ventilation unchanged, the PaO2 is 150 mmHg and PaCO2 is 48 mmHg. The most likely cause of these changes is
Three hours after undergoing coronary artery bypass grafting, an elderly man develops severe hypotension after intravenous administration of morphine 4 mg. Pulmonary artery occlusion pressure is 27 mmHg and central venous pressure is 30 mmHg. Transesophageal echocardiography shows decreased end-diastolic ventricular volumes. Which of the following is the most likely diagnosis?
A 60-year-old man undergoes transurethral resection of a bladder tumor in the lithotomy position with spinal anesthesia. During the procedure the surgeon reports that the patient's right leg is "jumping." This movement is most likely caused by stimulation of which of the following nerves?
A 68-year-old man with severe depression is scheduled for electroconvulsive therapy. He had a myocardial infarction two years ago and continues to have angina on exertion. Pretreatment with which of the following drugs is most likely to maintain stability during the procedure?
Which of the following cardiovascular abnormalities is LEAST likely to be present in a patient with end-stage alcoholic cirrhosis?
When inspired anesthetic gases are humidified
A 60-year-old obese man who has an antithrombin III deficiency is scheduled for radical prostatectomy. Prior to the operation this patient should receive
A 35-kg child requires mechanical ventilation with pure oxygen at a tidal volume of 350 ml and a rate of 20/min during a severe asthma attack. The most likely cause of severe hypotension after initiating mechanical ventilation is