10 Random Questions
The Bain circuit
(A) provides nearly identical delivered and inspired anesthetic concentrations
(B) has the fresh gas flow inlet near the reservoir bag
(C) is a nonrebreathing circuit at any fresh gas flow rate
(D) is most efficient during spontaneous ventilation
(E) has a time constant greater than 1 minute for change in inspired anesthetic concentrations
Reveal Answer
BASIC
Equipment & Physics
A 60-kg 25-year-old woman is undergoing laparoscopy in the Trendelenburg position during general anesthesia. Five minutes after peritoneal inflation, the peak airway pressure required to deliver a tidal volume of 800 ml increases from 25 cmH2O to 60 cmH2O. SpO2 decreases from 100% to 80% and systolic blood pressure increases from 110 mmHg to 140 mmHg. Which of the following is the most likely cause?
(A) Acute tension pneumothorax
(B) Excessively steep Trendelenburg position
(C) Excessive ventilator tidal volume setting
(D) Kink in the endotracheal tube
(E) Massive carbon dioxide embolism
Reveal Answer
BASIC
Respiratory & Critical Care
Compared with diazepam, midazolam
(A) is more lipid soluble
(B) has a longer elimination half-life
(C) has a larger volume of distribution
(D) has a greater clearance
(E) undergoes slower hepatic metabolism
Reveal Answer
A 40-year-old woman with Graves' disease is undergoing thyroidectomy with 1% isoflurane, 60% nitrous oxide, and oxygen. During surgical manipulation of the thyroid, temperature increases to 38.5°C, heart rate to 160 bpm, and blood pressure to 150/100 mmHg. The most appropriate initial treatment is to
(A) administer dantrolene sodium
(B) administer potassium iodide
(C) administer propranolol
(D) administer propylthiouracil
(E) increase the concentration of isoflurane
Reveal Answer
ADVANCED
General
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
Reveal Answer
BASIC
Equipment & Physics
Which of the following is most likely to occur during deliberate hypotension with trimethaphan?
(A) Bronchoconstriction
(B) Cerebral vasodilation
(C) Increased heart rate
(D) Potentiation of pancuronium
(E) Pupillary constriction
Reveal Answer
Long-term use of cimetidine is associated with
(A) delayed emergence after thiopental induction
(B) increased hypotension after morphine
(C) increased risk for isoflurane-induced nephrotoxicity
(D) prolonged action of succinylcholine
(E) prolonged sedation with diazepam
Reveal Answer
BASIC
Pharmacology & Pharmacokinetics
In a patient taking a beta-adrenergic blocker, the drug most likely to produce atrioventricular junctional block is
(A) diltiazem
(B) fentanyl
(C) halothane
(D) nifedipine
(E) verapamil
Reveal Answer
BASIC
Pharmacology & Pharmacokinetics
When performed with identical doses, which of the following types of regional block is associated with the highest plasma concentration of the drug?
(A) Brachial plexus
(B) Caudal
(C) Intercostal
(D) Subcutaneous infiltration
(E) Thoracic epidural
Reveal Answer
ADVANCED
Regional & Pain
Which of the following antihypertensive drugs is most likely to cause bradycardia?
(A) Captopril
(B) Clonidine
(C) Hydralazine
(D) Nifedipine
(E) Phenoxybenzamine
Reveal Answer