10 Random Questions
Which of the following is an advantage of a circle system over a Mapleson D system?
- (A) Better anesthetic conservation
- (B) Lower dead space
- (C) Lower circuit resistance
- (D) More efficient scavenging
- (E) More rapid changes in inspired gas concentration
During surgery with a carbon dioxide laser, which inhaled gas mixture is LEAST likely to promote combustion of the endotracheal tube?
- (A) Oxygen 25%-helium 75%
- (B) Oxygen 25%-nitrogen 75%
- (C) Oxygen 25%-nitrous oxide 75%
- (D) Oxygen 50%-nitrogen 50%
- (E) Oxygen 50%-nitrous oxide 50%
A 50-year-old patient is undergoing craniotomy for clipping of a cerebral aneurysm with isoflurane, nitrous oxide, and fentanyl anesthesia. At the time of aneurysm exposure, the EEG shows burst suppression. Which of the following is the most likely cause?
- (A) Cerebral ischemia
- (B) Cerebral vasospasm
- (C) Fentanyl effect
- (D) Isoflurane effect
- (E) Petit mal seizure activity
The plasma concentration of an intravenously administered drug follows the two-compartment kinetic model shown in the graph. Which of the following events is illustrated by the decline in plasma concentration shown at Time #2?
- (A) Decreasing activity of the drug at its receptor site
- (B) Distribution from plasma to tissue
- (C) Elimination of the drug from plasma
- (D) Increasing volume of distribution
- (E) Redistribution from vessel-rich groups to vessel-poor groups
A man with alcoholic cirrhosis and a hemoglobin concentration of 10 g/dl has an intraoperative PaO2 of 75 mmHg at an FiO2 of 0.5. Which of the following is the most likely cause of the low PaO2?
- (A) Anemia
- (B) Decreased cardiac output
- (C) Increased dead space
- (D) Intrahepatic arteriovenous shunts
- (E) Intrapulmonary arteriovenous shunts
Which of the following is a complication of glycine used for irrigation during transurethral resection of the prostate?
- (A) Epileptiform activity on EEG
- (B) Peripheral neuropathy
- (C) Tachycardia
- (D) Transient blindness
- (E) Transient deafness
A 54-year-old man is scheduled for open reduction of a fracture sustained when he jumped from a burning building. The carboxyhemoglobin concentration is 25%. Which of the following is the most reliable indicator of adequate oxygenation during general anesthesia?
- (A) PaO2 of 300 mmHg
- (B) pH of 7.38 with a PaCO2 of 41 mmHg
- (C) Mixed venous PO2 of 45 mmHg
- (D) Oxyhemoglobin saturation of 100% measured by co-oximeter
- (E) SpO2 of 100% measured by pulse oximeter
Which of the following shaded areas most accurately represents the dead space of a properly functioning circle system?
The speed of induction of anesthesia with an inhalational agent is increased by
- (A) decreased cardiac output
- (B) decreased minute ventilation
- (C) increased functional residual capacity
- (D) right-to-left intracardiac shunt
- (E) use of a more soluble agent
Which of the following statements concerning monitoring of neuromuscular function during general anesthesia is true?
- (A) Facial nerve electrodes underestimate recovery from block, compared with ulnar nerve electrodes
- (B) More current is required to depolarize a nerve beneath the negative electrode than beneath the positive electrode
- (C) Needle electrodes should be electrically grounded
- (D) Supramaximal voltage is 10% higher than the voltage required to elicit pain in the awake patient
- (E) The amount of neuromuscular block is underestimated if electrodes are placed on a paretic limb