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
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
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
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
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
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
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
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
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
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%