Which of the following statements concerning carbon monoxide poisoning is true? A 38-year-old woman with a large goiter has undergone subtotal thyroidectomy. Airway obstruction is noted immediately after extubation despite normal vocal cord function on laryngoscopy. Which of the following is the most likely explanation?
A 62-year-old man, who had a myocardial infarction three years ago, complicated by congestive heart failure and renal failure, is undergoing a colectomy. A pulmonary artery catheter demonstrates a cardiac output higher than measurements recorded during a cardiac catheterization two months after the infarction. Which of the following most likely contributes to the increased cardiac output?
(A) Creation of an arteriovenous fistula
(B) Increased hemoglobin concentration from 10 to 12 g/dL
(C) Stimulation of carotid body receptors
(D) Transcutaneous nitroglycerin
(E) Use of a beta-adrenergic blocker to prevent myocardial reinfarction
A
A 24-year-old man is undergoing induction of general anesthesia prior to appendectomy. During laryngoscopy, he regurgitates a large amount of bilious material. An endotracheal tube is inserted; aspiration shows bile-stained fluid. Which of the following is the most appropriate next step in management?
(A) Infusion of a loading dose of aminophylline
(B) Intravenous administration of broad-spectrum antibiotics
(C) Lavage of the tracheobronchial tree with saline solution
(D) Radiograph of the chest
(E) Proceeding with the operation
E
DC shocks of 200 joules applied directly to the heart are likely to
A patient with a fasting blood glucose concentration of 100 mg/dl undergoes a four-hour operation under general anesthesia without intraoperative administration of glucose. On emergence the most likely finding will be
A 75-year-old man is confused, restless, and disoriented two days after an aortic aneurysm repair. Serum sodium concentration is 112 mEq/L, serum osmolality is low, and urine is hypertonic. The most appropriate treatment is
(A) restriction of fluid intake
(B) administration of isotonic saline solution
(C) administration of hypertonic (3%) saline solution
(D) administration of spironolactone
(E) infusion of mannitol 25 g
C
During spinal anesthesia in a healthy patient, the sensory level rises to C8. The patient will most likely have
(A) hoarseness due to block of the recurrent laryngeal nerve
(B) numbness over the clavicles
(C) impaired resting ventilation
(D) numbness of the little finger
(E) inability to raise his arm
D
A 6-year-old child with severe cerebral palsy is scheduled for general anesthesia. He is at increased risk for each of the following EXCEPT
(A) gastroesophageal reflux
(B) hypersensitivity to central nervous system depressants