10 Random Questions
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
In the diagram, point "X" represents a patient with severe left ventricular dysfunction. The points labeled 1, 2, and 3 each represent the results of a different therapeutic intervention. Which of the following represents the most likely intervention at each point?
- (A) 1-Dopamine, 2-Furosemide, 3-Nitroprusside
- (B) 1-Dopamine, 2-Nitroprusside, 3-Furosemide
- (C) 1-Furosemide, 2-Dopamine, 3-Nitroprusside
- (D) 1-Nitroprusside, 2-Dopamine, 3-Furosemide
- (E) 1-Nitroprusside, 2-Furosemide, 3-Dopamine
A child undergoing general anesthesia is breathing spontaneously using the Jackson-Rees modification of the Ayres T-piece. Respiratory rate is 20/min and tidal volume is 75 ml. What is the minimum fresh gas flow required to prevent rebreathing?
- (A) 750 ml/min
- (B) 1500 ml/min
- (C) 2250 ml/min
- (D) 4500 ml/min
- (E) 6000 ml/min
The primary determinant of the duration of an intravenous regional block sufficient to provide surgical anesthesia of an upper extremity is
- (A) duration of tourniquet inflation
- (B) capacitance of the venous system of the extremity
- (C) local anesthetic agent injected
- (D) volume of anesthetic solution injected
- (E) method of exsanguinating the arm
Arterial pressure in the radial artery is 155/70 mmHg measured by a correctly calibrated catheter-transducer system. At the same time, aortic pressure is 140/75 mmHg using a high-fidelity catheter tip transducer. The most likely cause of this discrepancy is
- (A) a large amount of air in the dome of the radial artery transducer
- (B) coarctation of the aorta
- (c) peripheral vascular constriction produced by sympathetic stimulation
- (D) physiologic amplification of the waveform from the aorta to the radial artery
- (E) too high a frequency response in the catheter-transducer system
Which of the following pulmonary components is altered the most in a morbidly obese patient?
- (A) Total lung volume
- (B) Tidal volume
- (C) Inspiratory reserve volume
- (D) Expiratory reserve volume
- (E) Ratio of dead space to tidal volume
Each of the following statements about muscle rigidity induced by opioids is true EXCEPT:
- (A) The degree of rigidity is related to the rate of opioid administration
- (B) It is more apparent during the administration of nitrous oxide
- (C) Muscles of the trunk are affected more than muscles of the extremities
- (D) It results from a direct effect of the opioid on skeletal muscles
- (E) It can be produced by large doses of morphine
In a patient with adult respiratory distress syndrome who is being mechanically ventilated, which of the following findings indicates the most severe disease?
- (A) Decreased functional residual capacity
- (B) Decreased lung compliance
- (C) Hypercarbia
- (D) Hypoxemia
- (E) Increased dead space
Which of the following statements concerning banked blood is true?
- (A) Red blood cells preserved with CPDA-1 have a shelf life of approximately 21 days
- (B) Packed red blood cells deliver oxygen normally immediately after administration
- (C) Packed red blood cells contain most of the leukocytes present in the donated unit
- (D) Citrate is used as a source of energy for whole blood
- (E) Stored whole blood contains all coagulation factors except II and VIII
An apneic adult is receiving an oxygen flow of 4 L/min through a rigid bronchoscope. After five minutes of apnea, which of the following findings is most likely?
- (A) A decrease in cardiac output
- (B) A decrease in pulmonary vascular resistance
- (C) A decrease in SpO2 from 99% to 89%
- (D) An increase in PaCO2 of 18 mmHg
- (E) Serum bicarbonate concentration of 30 mEq/L