10 Random Questions
Which of the following statements concerning the check valve of the common gas outlet on an anesthesia gas machine is true?
(A) It prevents backflow into vaporizers
(B) It prevents delivery of a hypoxic mixture
(C) It prevents rebreathing
(D) It is located downstream from the oxygen flush valve
(E) It is required for proper functioning of the proportioning system
Reveal Answer
BASIC
Equipment & Physics
To detect the delivery of hypoxic gas mixture, the optimal location for an oxygen analyzer in this circle is
(A) 1
(B) 2
(C) 3
(D) 4
(E) 5
Reveal Answer
BASIC
Equipment & Physics
Monitoring sensory evoked potentials may be useful in detecting functional derangement of each of the following EXCEPT
(A) cranial nerve pathways during posterior fossa operations
(B) motor pathways during anterior cervical discectomy
(C) dorsal column pathways during operations for spinal tumors
(D) visual pathways during operations on the sphenoid wing
(E) cortical pathways during carotid artery operations
Reveal Answer
ADVANCED
Neuro
A 68-year-old patient is undergoing total hip replacement during general anesthesia using positive pressure ventilation and neuromuscular blockade. Intraoperative monitoring shows a gradual decrease in end-tidal CO2, an increase in exhaled tidal volume, and an increase in measured FiO2. Which of the following is the most likely cause of these changes?
(A) Air entrainment around a deflated endotracheal tube cuff
(B) Channeling of the exhaled air through the carbon dioxide canister
(C) Fat embolism
(D) Inadequate muscle relaxation with spontaneous patient ventilation
(E) A small hole in the ventilator bellows
Reveal Answer
BASIC
Equipment & Physics
Which of the following statements concerning anesthetic management for MRIs is true?
(A) ECG wires are associated with patient burns
(B) Mechanical ventilation of the lungs is not feasible
(C) Monitors with ferromagnetic components may be used
(D) Oxygen analysis of inspired gas is inaccurate
(E) Pulse oximetry is not reliable near the MR scanner
Reveal Answer
Which of the following conditions is a contraindication to the use of succinylcholine?
(A) Burns of 50% body surface area occurring 12 hours ago
(B) Cirrhosis
(C) Myotonic dystrophy
(D) Seizure disorder
(E) Spinal cord transection within the past six hours
Reveal Answer
ADVANCED
Pharmacology & Pharmacokinetics
A 10-week-old infant born at 28 weeks gestation is scheduled for elective repair of bilateral inguinal hernias. It is most appropriate to
(A) delay the operation until the infant is 6 months old
(B) transfuse blood preoperatively if hemoglobin concentration is 9 g/dl
(C) avoid tracheal intubation
(D) limit inspired oxygen concentration to less than 50%
(E) monitor for apnea for 24 hours postoperatively
Reveal Answer
ADVANCED
Pediatric
A 39-year-old patient with insulin-dependent diabetes mellitus receives thiopental 250 mg and succinylcholine 80 mg and is ventilated with 0.75% isoflurane in oxygen. Arterial pressure decreases abruptly from 140/100 to 80/50 mmHg while heart rate remains unchanged at 70 bpm. Failure of heart rate to increase most likely results from
(A) acute hypoglycemia
(B) autonomic neuropathy
(C) depression of sinus node function by thiopental
(D) depression of the baroreflex response by isoflurane
(E) ganglionic stimulation by succinylcholine
Reveal Answer
ADVANCED
General
The supine hypotensive syndrome of pregnancy
(A) begins at 32 weeks' gestation
(B) causes fetal distress by aortocaval compression
(C) is corrected by Trendelenburg's position
(D) is less likely following subarachnoid block than epidural block
(E) occurs in 90% of supine women at 38 to 40 weeks' gestation
Reveal Answer
ADVANCED
OB
Which of the following statements concerning the cerebral effects of barbiturates is true?
(A) Barbiturate coma produces greater cerebral protection than hypothermia to 17 C
(B) Barbiturate-induced reduction in cerebral blood flow is greater at normocarbia than at hypocarbia
(C) Barbiturates decrease the cerebral metabolic rate for oxygen by decreasing cerebral blood flow
(D) Somatosensory evoked potentials and the EEG are equally sensitive to suppression by barbiturates
(E) When administered in doses sufficient to produce an isoelectric EEG, barbiturates decrease the cerebral metabolic rate for oxygen by 50%
Reveal Answer