Prior to occlusion of any major pulmonary blood vessels during a thoracotomy, applying positive end-expiratory pressure to ventilation through the dependent lumen of a double-lumen tube and occluding the upper lumen of the tube will
(A) increase blood flow to the dependent lung
(B) increase the alveolar-arterial oxygen tension difference
A 27-year-old man with chronic renal failure is to undergo revision of an arteriovenous graft. He insists on general anesthesia. Hemodialysis was completed two hours ago, and serum potassium concentration is now 5 mEq/L. Which of the following statements concerning anesthetic management of this patient is true?
(A) Enflurane is contraindicated
(B) Succinylcholine is contraindicated
(C) Neostigmine will be required in larger than usual dosage
(D) The duration of action of atracurium will be prolonged
(E) The duration of action of propofol will be unchanged
E
While checking an anesthesia machine, opening the oxygen flow-control valve yields no oxygen flow, although the wall-mounted oxygen pipeline supply gauge reads 50 psig. Opening the backup oxygen cylinder results in normal oxygen flow. The most likely cause is
(A) failure of the oxygen pipeline supply
(B) failure of the second-stage oxygen pressure regulator
(C) a malfunctioning check valve in the oxygen pipeline supply inlet
Following antagonism of a nondepolarizing muscle relaxant with neostigmine, twitch height is normal. To achieve this effect, the percentage of the acetylcholine receptor pool that must be free of muscle relaxant is
When antagonizing neuromuscular block produced by pancuronium, the combination of simultaneously administered anticholinergic and anticholinesterase drugs that is most likely to produce bradycardia is
Following induction of anesthesia with sufentanil and pancuronium, a patient with left main coronary artery disease has a decrease in blood pressure from 110/70 to 60/40 mmHg. There is no change in heart rate or ECG. The most appropriate management of the hypotension is administration of
(A) calcium chloride
(B) ephedrine
(C) epinephrine
(D) isoproterenol
(E) phenylephrine
E
Each of the following statements concerning norepinephrine is true EXCEPT:
(A) Extraneuronal uptake is important in the termination of its activity
A patient is bleeding excessively after routine transurethral resection of the prostate. Re-exploration discloses diffuse oozing. The most appropriate management is administration of