A Fluotec vaporizer is set to administer halothane 4% using a fresh gas flow of 4 L/min. If the diluent gas flow is increased to 8 L/min, and at the same time the room temperature increases from 20 to 25°C, the approximate concentration of halothane delivered to the patient would be
An unvaccinated health care worker is stuck by a needle contaminated with blood from an HBsAg-positive patient. Which of the following statements concerning this situation is true?
(A) The risk for development of HIV infection is greater than the risk for development of hepatitis
(B) Hepatitis immune globulin is indicated if the health care worker is HBcAg positive
(C) Hepatitis B vaccine should be administered
(D) Hepatitis immune globulin will protect equally against hepatitis B and hepatitis C (non-A, non-B)
(E) Hepatitis B vaccine carries a risk for transmission of HIV
A healthy 57-year-old man with a ureteral calculus is scheduled for immersion extracorporeal shock wave lithotripsy. Which of the following statements is true?
(A) Delivery of the shock wave is timed by the R wave of the ECG
(B) Continuous epidural anesthesia is contraindicated because of the risk for infection
(C) If a regional technique is used, a T10 sensory level is required for adequate anesthesia
(D) If general anesthesia is used, high tidal volumes and low respiratory rate are preferred
(E) Removal of the patient from the bath is accompanied by an increase in blood pressure
During controlled ventilation, which of the following will cause an increase in end-tidal carbon dioxide tension with a normal waveform on the capnograph?
(A) Bronchospasm
(B) Rapid blood loss
(C) Ventricular fibrillation
(D) Endobronchial migration of the endotracheal tube
A celiac plexus block effectively relieves pain at which of the following sites?
(A) Abdominal viscera above the pelvis
(B) Parietal peritoneum above the pelvis
(C) Pelvic parietal peritoneum
(D) Pelvic viscera
(E) Visceral pleura
A
A 45-kg, 80-year-old woman undergoes pin fixation of the right hip in the lateral decubitus position under spinal anesthesia. One day after the operation, she cannot move her left ankle or foot actively. The most likely cause is