10 Random Questions
A patient has a heart rate of 110 bpm one year after heart transplantation. His tachycardia is most likely the result of
(A) altered baroreceptor sensitivity
(B) cardiac denervation
(C) compensation for a fixed stroke volume
(D) cyclosporine
(E) prednisone
Reveal Answer
ADVANCED
Cardiac
The last muscle to be affected by an interscalene brachial plexus block is the
(A) brachialis
(B) brachioradialis
(C) biceps
(D) flexor carpi radialis
(E) interosseous
Reveal Answer
ADVANCED
Regional & Pain
A 50-year-old man with alcoholism and jaundice is scheduled to undergo umbilical herniorrhaphy. An increase in which of the following best indicates impaired synthetic hepatic function?
(A) Prothrombin time
(B) Serum alanine aminotransferase concentration
(C) Serum albumin/globulin ratio
(D) Serum alkaline phosphatase concentration
(E) Serum bilirubin concentration
Reveal Answer
BASIC
General
During prolonged labor, a fetal scalp blood sample shows a PO2 of 21 mmHg, a PCO2 of 46 mmHg, and a pH of 7.35. These findings suggest
(A) fetal hypoxemia
(B) maternal hypoventilation
(C) sampling of venous blood
(D) miscalibration of the oxygen electrode
(E) no abnormality
Reveal Answer
ADVANCED
Pediatric
A 64-year-old, 87-kg woman in good general health is undergoing a right knee arthroplasty while in the supine position with general anesthesia consisting of enflurane 2% and nitrous oxide 50% in oxygen. She is breathing spontaneously through a 7-mm endotracheal tube. During the first 30 minutes of the procedure, the arterial oxygen saturation measured by pulse oximetry decreases from 98% to 92%. The most likely cause of the desaturation is
(A) decreased functional residual capacity
(B) diffusion hypoxia
(C) hypercarbia
(D) increased airway resistance produced by the endotracheal tube
(E) inhibition of hypoxic pulmonary vasoconstriction
Reveal Answer
BASIC
Respiratory & Critical Care
General
The most important cause of hypotension that occurs normally at initiation of cardiopulmonary bypass is
(A) hemodilution
(B) acidosis
(C) decreased flow rate
(D) vasodilation
(E) hypothermia
Reveal Answer
In pregnant patients, which of the following is an effect of the long-term use of cocaine?
(A) Decreased uterine tone
(B) Decreased thiopental requirement
(C) Increased isoflurane MAC
(D) Increased sensitivity to ephedrine
(E) Lower than expected level of block with tetracaine spinal analgesia
Reveal Answer
ADVANCED
OB
Which of the following differentiates midazolam from diazepam administered intravenously in equipotent doses?
(A) Greater hemodynamic stability
(B) Lack of active metabolites
(C) Less respiratory depression
(D) Longer duration of action
(E) More rapid onset
Reveal Answer
If administered epidurally in equipotent doses, which of the following opioids will produce analgesia over the greatest number of dermatomes?
(A) Fentanyl
(B) Hydromorphone
(C) Meperidine
(D) Morphine
(E) Sufentanil
Reveal Answer
Which of the following statements concerning anesthesia machine flowmeters is true?
(A) At high gas flows, viscosity is the predominant determinant of flow rate
(B) At low flow rates, gas density is the predominant determinant of flow rate
(C) Flowmeters should be upstream from the oxygen fail-safe device
(D) The oxygen flowmeter should be upstream from other flowmeters
(E) Tapered flow tubes allow a constant decrease in pressure across the float
Reveal Answer
BASIC
Equipment & Physics