A moderately obese 38-year-old woman is using patient-controlled morphine analgesia one day after open cholecystectomy. While breathing room air, oxygen saturation is 85%, Pa02 is 48 mmHg, PaC02 is 42 mmHg, and pH is 7.36. In addition to administration of oxygen, the most effective management is to
(A) decrease the dosage of opioids
(B) change to epidural morphine
(C) administer an inhaled bronchodilator
(D) initiate 4 cm of nasal continuous positive airway pressure
(E) initiate incentive spirometry therapy
E
A 36-year-old woman develops acute airway obstruction 24 hours after total thyroidectomy. The most likely cause is
A healthy, 18-year-old, 65-kg woman undergoing diagnostic laparoscopy is being monitored with a properly functioning and calibrated capnograph. The end-tidal carbon dioxide concentration is 6%, and the inspired carbon dioxide concentration is 1%. This may be caused by each of the following EXCEPT
(A) malfunction of the expiratory valve in a circle system
(B) low gas inflow with a Bain circuit
(C) exhausted soda lime within a circle system
(D) absorption of carbon dioxide from carbon dioxide laparoscopy
Which of the following is the most appropriate initial therapy for acute pulmonary hypertension with right ventricular dysfunction and severe systemic hypotension that occurs during anesthesia?
A 30-year-old man who is breathing spontaneously has a ventilatory pattern of sustained deep inspiration and occasional expiratory gasps during emergence from general anesthesia after posterior fossa craniotomy. Which of the following is the most likely cause?
A 43-year-old man has been hoarse for two weeks since undergoing anterior cervical fusion at C7-8 for treatment of a herniated disk. Laryngoscopy shows paralysis of the right vocal cord. Which of the following is the most likely cause?
(A) Damage to the glossopharyngeal nerve during surgery
(B) Damage to the superior laryngeal nerve during surgery
(C) Nerve root compression by the herniated disk
(D) Stretching of the recurrent laryngeal nerve during surgery