A patient with chronic paraplegia (T4 level) is undergoing cystoscopy and removal of bladder calculi without anesthesia. After 10 minutes, blood pressure is 240/100 mmHg and pulse is 50 bpm. The most appropriate management is administration of
A full-term newborn has marked respiratory distress in the delivery room. Breath sounds are asymmetric and the abdomen is scaphoid. Which of the following maneuvers is most appropriate?
(A) Hyperventilation with bag and mask
(B) Intubation and ventilation with positive end-expiratory pressure
(C) Intubation and ventilation with zero end-expiratory pressure
During active labor, 10 ml of bupivacaine 0.5% with epinephrine 1:200,000 is administered epidurally. Fifteen minutes later, maternal blood pressure is 70/50 mmHg and heart rate is 70 bpm; fetal heart rate is 90 bpm for 45 seconds, with loss of beat-to-beat variability. The most likely explanation for the fetal vital signs is
During ligation of a patent ductus arteriosus, a newborn infant receives a total gas flow of 5 L/min through a nonheated Jackson-Rees system. Operating room temperature is maintained at 30°C. The primary cause of a rapid decrease in rectal temperature from 36.8°C to 35°C is
(A) absence of the central temperature control mechanism