Which of the following provides the earliest indication of myocardial ischemia during general anesthesia?
(A) Cardiac index
(B) Mixed venous oxygen saturation
(C) Pulmonary artery occlusion pressure
(D) Regional ventricular wall motion
(E) ST-segment depression on ECG
D
A newborn infant is undergoing repair of gastroschisis. During closure of the abdominal wall, ventilatory pressures and central venous pressure increase markedly. The most appropriate management is to
(A) administer a bronchodilator
(B) decrease tidal volume and increase ventilatory rate
A patient undergoes thoracotomy in the lateral decubitus position. Which of the following maneuvers is most likely to increase PaO2 during one-lung ventilation?
(A) Applying continuous positive airway pressure to the nondependent lung
(B) Applying positive end-expiratory pressure to the dependent lung
A normal adult is receiving general anesthesia via a standard circle system and controlled ventilation. Mass spectrometer data are shown. Which event is most compatible with these data?
A 70-kg 22-year-old patient with head trauma and multiple fractures of the long bones is scheduled for fixation of bilateral femoral fractures. Preoperative laboratory studies show a serum sodium concentration of 150 mEq/L, a serum potassium concentration of 3.1 mEq/L, and a urine output greater than 500 ml/hr. Which of the following agents will decrease urine output?