10 Random Questions
Which of the following combinations of anesthetic and incorrect vaporizer results in the smallest error in delivered concentration?
- (A) Sevoflurane in a halothane vaporizer
- (B) Sevoflurane in an isoflurane vaporizer
- (C) Halothane in a desflurane vaporizer
- (D) Isoflurane in a halothane vaporizer
- (E) Sevoflurane in a desflurane vaporizer
A 62-year-old woman with polycythemia vera is scheduled to undergo total knee arthroplasty using a tourniquet. Preoperative hematocrit is 60%. Which of the following is the most appropriate action?
- (A) Perform total knee arthroplasty without use of a tourniquet
- (B) Preoperative reduction of the hematocrit to 45% to 50%
- (C) Prophylactic administration of aprotonin during surgery
- (D) Prophylactic administration of epsilon-aminocaproic acid during surgery
- (E) Prophylactic administration of low-dose heparin during surgery
A patient undergoes differential spinal block for evaluation of persistent foot pain. If the pain returns coincident with a decrease in skin temperature, which of the following is the most appropriate conclusion?
- (A) A somatic origin is ruled out
- (B) The patient has causalgia
- (C) The patient has peripheral vascular disease
- (D) The pain is caused by central neuropathy
- (E) Lumbar sympathetic blocks are indicated
Which of the following is most effective in decontaminating an anesthesia machine that was splattered with HIV-contaminated blood?
- (A) Bleach
- (B) Deionized water
- (C) Ethylene oxide
- (D) Hydrogen peroxide
- (E) Isopropyl alcohol
Cyanide toxicity from nitroprusside is unlikely in patients with renal dysfunction because
- (A) renal excretion of thiosulfate is decreased
- (B) metabolic acidosis inactivates cyanide
- (C) anemia inhibits breakdown of nitroprusside by oxyhemoglobin
- (D) thiocyanate is formed in the liver
- (E) the dose of nitroprusside necessary to lower blood pressure is greatly decreased
Five minutes after intrathecal administration of tetracaine 12 mg in hyperbaric solution, a 60-year-old man has a weak hand grasp. Respirations are normal, heart rate has decreased from 80 to 45 bpm, and blood pressure has decreased from 150/80 to 90/50 mmHg. The most appropriate management at this time is
- (A) administration of atropine
- (B) administration of ephedrine
- (C) administration of phenylephrine
- (D) placement of the patient in the head-down position
- (E) observation
Immediately after a retrobulbar block for cataract surgery, the eye grossly protrudes and the patient has the sensation of pressure in the eye. The most appropriate initial intervention is
- (A) hyperventilation
- (B) surgical drainage of a hematoma
- (C) manual compression of the globe
- (D) administration of atropine intravenously
- (E) administration of mannitol intravenously
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
- (A) 10
- (B) 25
- (C) 33
- (D) 50
- (E) 75
Which of the following is LEAST likely to decrease myocardial oxygen supply?
- (A) Administration of enflurane
- (B) Epidural anesthesia to a sensory level of T6
- (C) Increased pulmonary artery occlusion pressure
- (D) Hypocarbia (PaCO, 25 mmHg)
- (E) Metabolic acidosis (pH 7.20)
In the event of a leak in the air flowmeter, which flowmeter arrangement produces the lowest risk of delivering hypoxic gas mixtures?
- (A) Air, O2, N2O
- (B) N2O, O2, Air
- (C) N2O, Air, O2
- (D) O2, Air, N2O
- (E) O2, N2O, Air