A 45-year-old woman who sustained a subarachnoid hemorrhage 18 hours ago develops a severe headache and becomes unresponsive. Which of the following is the most likely cause of this patient's change in mental status?
The two E oxygen cylinders on an anesthesia machine have pressure readings of 1100 psi each. At an oxygen flow of 3 L/min, there will be sufficient oxygen for approximately
A patient suddenly makes a respiratory effort during craniotomy for clipping of a cerebral aneurysm in a 15-degree head-up position with controlled ventilation. The most likely cause is
Eight hours after abdominal surgery, a 51-year-old patient becomes increasingly somnolent. Epidural morphine 5 mg was administered immediately following the procedure. Postoperatively, respiratory rate has not decreased below 12/min and Sp02 has remained greater than 92%. Arterial blood gas analysis shows Pa02 80 mmHg, PaC02 82 mmHg, and pH 7.1. Which of the following is the most appropriate conclusion?
(A) Analysis of the blood sample was delayed
(B) The blood sample was venous rather than arterial
(C) The patient is receiving supplemental oxygen
(D) The pulse oximeter readings are falsely high
(E) No treatment is required at this time
C
Which of the following statements concerning nalbuphine is true?
(A) It causes partial reversal of morphine-induced ventilatory depression
(B) Analgesia is partially mediated by delta receptor agonism
(C) Its antagonist effects are mediated at kappa receptors
(D) Duration of action is significantly shorter than that of morphine
(E) Ventilatory drive is not depressed
A
A 35-year-old woman with severe myasthenia gravis is scheduled for thymectomy. Which of the following preoperative pulmonary function tests is most likely to be normal?