10 Random Questions
Which of the following is the most appropriate action after an anesthetic vaporizer is tipped?
- (A) Return to the manufacturer for recalibration
- (B) Flush the vaporizer with oxygen at 5 L/min for 24 hours
- (C) Store the vaporizer for 24 hours at room temperature
- (D) Set the vaporizer at low concentration and flush with oxygen at 10 L/min for 30 minutes
- (E) Verify the vaporizer output with mass spectrography
One hour after an open cholecystectomy, a 42-year-old patient is hemodynamically stable and breathing spontaneously (rate 10/min and regular) at an FiO2 of 0.4. Fentanyl, isoflurane, nitrous oxide, and pancuronium were used during the procedure. Analysis of arterial blood gases (pH, pCO2, pO2) is most likely to show:
- (A) 7.18 40 100
- (B) 7.18 60 140
- (C) 7.28 50 85
- (D) 7.40 26 220
- (E) 7.40 40 40
The Mapleson A system (Magill circuit) illustrated
- (A) is functionally equivalent to the Bain circuit
- (B) prevents rebreathing more effectively during controlled ventilation than during spontaneous ventilation
- (C) provides better humidification than the Mapleson D system
- (D) requires a fresh gas flow equal to minute ventilation to prevent rebreathing during spontaneous ventilation
- (E) results in less rebreathing during controlled ventilation than the Mapleson C system
Which of the following is true of both the neonatal and adult airways?
- (A) Epiglottic innervation is primarily vagal
- (B) Sniffing position requires placement of a pillow under the occiput
- (C) The cricoid ring is the narrowest part of the airway
- (D) The epiglottis has a relatively similar size and shape
- (E) The glottis is located at C3-4
Following extubation after nasotracheal intubation for seven days, a 35-year-old man has fever, facial pain, nasal stuffiness, and purulent nasal secretions. The most likely cause is
- (A) eustachian tube obstruction
- (B) frontal sinusitis
- (C) maxillary sinusitis
- (D) parotiditis
- (E) retropharyngeal abscess
A patient is placed in the prone jackknife position for lumbar subarachnoid injection of tetracaine 10 mg in 10 ml of preservative-free sterile water. Which of the following results is most likely?
- (A) Respiratory insufficiency
- (B) Sensory and motor block at T4-S1
- (C) Sensory and motor block at L1-S5
- (D) Sensory loss without motor block at L1-S5
- (E) Sensory and motor block at S3-S5
A 62-year-old man, who had a myocardial infarction three years ago, complicated by congestive heart failure and renal failure, is undergoing a colectomy. A pulmonary artery catheter demonstrates a cardiac output higher than measurements recorded during a cardiac catheterization two months after the infarction. Which of the following most likely contributes to the increased cardiac output?
- (A) Creation of an arteriovenous fistula
- (B) Increased hemoglobin concentration from 10 to 12 g/dL
- (C) Stimulation of carotid body receptors
- (D) Transcutaneous nitroglycerin
- (E) Use of a beta-adrenergic blocker to prevent myocardial reinfarction
A healthy, spontaneously breathing, supine, anesthetized patient has a PaCO2 to PetCO2 difference of 3 mmHg. Following institution of mechanical ventilation the value increases to 12 mmHg. The most likely cause of this change is
- (A) cephalad displacement of the diaphragm
- (B) decreased production of carbon dioxide
- (C) increased cardiac output
- (D) increased shunting of blood through dependent lung zones
- (E) increased ventilation of nondependent lung zones
When inspired anesthetic gases are humidified
- (A) most particles 1 to 2 microns in size are deposited in the trachea
- (B) respiratory epithelial cilia become less active
- (C) alveolar water vapor pressure is unchanged
- (D) respiratory heat loss is abolished
- (E) sterilization of breathing apparatus is mandatory
Preoperative evaluation shows a serum sodium concentration of 140 mEq/L, serum chloride concentration of 90 mEq/L, PaCO2 of 46 mmHg, and arterial pH of 7.50. These findings are most indicative of prior treatment with
- (A) acetazolamide
- (B) enalapril
- (C) furosemide
- (D) mannitol
- (E) spironolactone