Each of the following conditions is a cause of agitation in a patient following transurethral resection of the prostate EXCEPT
(A) bladder distention
(B) glycine absorption
(C) inadequate analgesia
(D) serum sodium concentration of 127 mEq/L
(E) systolic pressure of 60 mmHg
D
A 29-year-old man who has been nasotracheally intubated for two weeks following a motor vehicle accident has a fever (39C) and a constant headache. Leukocyte count is 18,000/mm3. The most likely cause is
A patient has fever and chills in the recovery room following an abdominal hysterectomy that required the intraoperative administration of whole blood 1 unit. A blood sample drawn in the recovery room shows no free hemoglobin. Subsequently, packed red blood cells 1 unit and fresh frozen plasma 1 unit are administered, and the fever and chills recur. The most likely cause of the fever and chills is
(A) an allergic-type transfusion reaction
(B) a hemolytic transfusion reaction to untested antibodies
(C) bacterial contamination of blood
(D) a reaction to leukocytes contained in the plasma
(E) the presence of cold agglutinins in the patient
D
A previously healthy, 60-kg, 17-year-old boy is undergoing emergency surgery for a gunshot wound involving the iliac vein. Ventilation is controlled with a tidal volume of 700 ml/breath, rate of 10/min, and peak inspiratory pressure of 30 cmH2O. Body temperature is normal. The most likely cause of an end-tidal carbon dioxide partial pressure of 16 mmHg is
Which of the following is the most likely effect of long-term exposure to nitrous oxide at a concentration of 50 ppm?
(A) Impaired cognitive function
(B) Inhibition of vitamin B-12 absorption
(C) Megaloblastic changes in bone marrow
(D) Teratogenesis
(E) Thrombocytopenia
C
A 68-year-old man has signs of a coagulopathy after receiving 10 units of packed erythrocytes during emergency repair of a leaking abdominal aortic aneurysm. The most likely cause is
An axillary block is administered to a 60-kg patient using 40 ml of 0.5% bupivacaine. Ten minutes after placement of the block, the patient has a seizure. Which of the following statements is true?
(A) A low serum albumin concentration could have contributed to the occurrence of the seizure
(B) CNS hypoperfusion is the most likely cause of the seizure
(C) The seizure was probably secondary to an allergic reaction to the local anesthetic
(D) The use of an equipotent dose of lidocaine rather than bupivacaine would have decreased the likelihood of