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
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 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?
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
In a patient with adult respiratory distress syndrome who is being mechanically ventilated, which of the following findings indicates the most severe disease?
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?