10 Random Questions
An air/oxygen blender with E-size cylinders is supplying gas to a Mapleson D circuit being used to ventilate a neonate during transport. The air tank is full (psi= 1900/625 L) and flow is 4 L/min. The oxygen tank flow is 5 L/min and the pressure gauge indicates 500 psi. If the flow rates remain unchanged, which of the following statements is correct?
- (A) The air tank will be empty in 90 minutes
- (B) The oxygen tank will be empty in 30 minutes
- (C) The concentration of oxygen in the circuit is 60%
- (D) The oxygen tank will fill with air when the pressure gauge falls below 50 psi
- (E) The volume of oxygen remaining can be determined only by weighing the tank
Which of the following limits the use of nalbuphine for relief of postoperative pain?
- (A) High incidence of nausea and vomiting
- (B) High incidence of delayed respiratory depression
- (C) Potential for inducing seizures with repeated doses
- (D) Relatively low maximal analgesic effect
- (E) Short duration of action
During transurethral resection of the prostate under spinal anesthesia with a sensory level to T10, a patient has sudden onset of sharp upper abdominal pain and nausea. Arterial blood pressure increases from 120/80 to 150/90 mmHg; the patient becomes diaphoretic. Which of the following is the most likely diagnosis?
- (A) Bladder perforation
- (B) Hemolysis
- (C) Hypervolemia
- (D) Hyponatremia
- (E) Myocardial ischemia
A radial artery catheter is to be used for blood pressure measurement during a sitting craniotomy. When zeroing the transducer, which of the following describes the best levels for placement of the transducer and opening of the system to air? (Transducer, Opening to Air)
- (A) Head Wrist
- (B) Head Head
- (C) Head Heart
- (D) Heart Heart
- (E) Heart Wrist
Which of the following is characteristic of low back pain associated with myofascial pain syndrome but not of pain associated with a herniated lumbar disk?
- (A) Loss of reflexes in the lower extremities
- (B) Pain along the distribution of nerve roots
- (C) Responsiveness to epidural corticosteroids
- (D) Sensitivity to injection at trigger points
- (E) Trophic alteration in the sympathetic nervous system
The need for increased doses of nondepolarizing muscle relaxants in patients with extensive burns is best explained by
- (A) increased protein binding
- (B) hypermetabolism
- (C) increased glomerular filtration rate
- (D) proliferation of receptors on burned muscle
- (E) decreased volume of distribution
Which of the following provides the most definitive diagnosis in a patient with suspected brain death?
- (A) Absent bilateral somatosensory evoked potentials
- (B) Absent cerebral blood flow during four-vessel contrast cerebral arteriography
- (C) Intracranial pressure greater than mean arterial pressure
- (D) Score of zero on Glasgow Coma Scale
- (E) Two isoelectric electroencephalograms
Which of the following best describes cardiomyopathy following therapy with doxorubicin (Adriamycin)?
- (A) The initial presentation is concentric hypertrophy
- (B) The diagnosis is confirmed by a shortened QT interval
- (C) It is exacerbated by hyperoxia
- (D) It is resistant to inotropic agents
- (E) It: may persist for years after therapy is discontinued
A 75-year-old, 60-kg man with moderately disabling heart failure secondary to ischemic heart disease is undergoing a transurethral prostatic resection under halothane-nitrous oxide anesthesia. Resection time is 30 minutes, and fluid replacement has been lactated Ringer's solution 500 mL. Although heart rate is unchanged, the arterial pressure monitor used because of his cardiac condition has changed from A to B over the last 15 minutes. The most appropriate management is to
- (A) discontinue halothane
- (B) adminster ephedrine 10 mg intravenously
- (C) administer digoxin one half of his daily dose intravenously
- (D) administer sodium chloride 100 mL of 3%
- (E) do none of the above
Two hours after a colon resection, a 60-year-old woman with adult-onset diabetes mellitus is somnolent and has a blood glucose concentration of 612 mg/dl. Which of the following findings are most likely? (Sodium, Osmolality, Intravascular volume)
- (A) 127, 280, High
- (B) 127, 310, High
- (C) 127, 330, Low
- (D) 140, 280, Normal
- (E) 140, 300, Low