During cardiopulmonary bypass, the perfusionist notes that the mixed venous oxygen saturation has decreased from to 55%. Which of the following is the most likely cause?
Compared with fentanyl, alfentanil is characterized by
A 70-kg, 22-year-old man who is unconscious after a closed head injury is to undergo emergency splenectomy. He is anesthetized with thiopental, given pancuronium for paralysis, and started on nitrous oxide and oxygen 50% each with controlled ventilation (tidal volume 700 ml, rate 10/min). Pulse is 70 bpm, blood pressure is 160/100 mmHg, PaO2 is 65 mmHg, PaC02 is 45 mmHg, and pH is 7.30. In adjusting the ventilator at this time, which of the following is most appropriate?
You see a flash of fire from the endotracheal tube of a patient undergoing carbon dioxide laser excision of laryngeal polyps. The immediate response should be to
Which of the following produces falsely high Sp02?
A 4-year-old child with myelomeningocele and a ventriculoperitoneal shunt is scheduled for bladder augmentation. One year ago, hypotension and bronchospasm occurred during laparotomy for placement of a feeding gastrostomy and responded to fluids and epinephrine. At that time, anesthesia was induced with thiopental, the trachea was intubated with a polyvinyl tracheal tube following administration of succinylcholine, and anesthesia was maintained with halothane and nitrous oxide. No diagnostic tests were performed after that incident. Which of the following should be avoided during the bladder augmentation?
Compared with the demand-flow intermittent mandatory ventilation (IMV) system, the continuous-flow IMV system has which of the following characteristics?
A 54-year-old woman who is scheduled to undergo emergency exploratory laparotomy takes warfarin sodium for anticoagulation. Prothrombin time is 19 sec (control 12 sec). Which of the following agents is most appropriate to reverse the effects of warfarin?
Administration of succinylcholine 1 mg/kg to a pregnant woman rarely causes fetal neuromuscular blockade. Which characteristic of succinylcholine best explains this phenomenon?
Compared with adults, neonatal respiratory function is characterized by