Arterial oxyhemoglobin desaturation develops more rapidly following apnea in a pregnant patient at term than in a nonpregnant patient with a large intra-abdominal tumor. Which of the following findings in pregnancy is the most likely cause?
A meconium-stained, full-term infant has an initial Apgar score of 2. The oropharynx is suctioned and the infant is placed on a heated table. Which of the following is the most appropriate next step in management of the airway?
A 66-year-old patient with aortic stenosis is scheduled for aortic valve replacement. Examination shows blood pressure of 110/60 mmHg and sinus rhythm at a rate of 75 bpm. Pulmonary artery occlusion pressure (PAOP) is 20 mmHg with a prominent a-wave on the tracing. Which of the following is the most appropriate management?
Physiologically, coronary blood flow relates most directly to
Four days after mitral valve replacement, a 49-year-old, 70-kg woman who has had oliguric renal failure since the operation requires insertion of a Schribner shunt for hemodialysis. Her BUN concentration is 104 mg/dl, serum creatinine is 9.3 mg/dl, serum sodium is 130 mEq/L, and serum potassium is 6.7 mEq/L. During the operation under local anesthesia, diazepam 7.5 mg and morphine 10 mg are administered intravenously to control agitation. Five minutes later while she is sleeping quietly, unifocal premature ventricular contractions appear at a rate of 10 per minute on the ECG monitor. The most appropriate therapy is to
A patient is undergoing exploration of a stab wound to the left side of the neck. On awake laryngoscopy, the left vocal cord is in midposition and the right vocal cord is abducted during inspiration. The most likely cause of these findings is trauma to which of the following structures on the left?
In patients with blunt head trauma, cerebral perfusion pressure is determined by the gradient between
Which of the following is the strongest indication for one-lung ventilation?
Alveolar partial pressure of an inhaled anesthetic rises more rapidly in a parturient at term than in a nonpregnant woman because
Which of the following is the most effective treatment of shivering following general anesthesia?