10 Random Questions
A 30-year-old woman is undergoing laparoscopic tubal ligation. Thirty minutes after induction of general anesthesia, arterial oxygen saturation has decreased to 89%. Arterial blood gases at an FiO2 of 1.0 are PaO2 63 mmHg and PaCO2 40 mmHg; PetCO2 is 32 mmHg. Which of the following is the most likely cause?
- (A) Carbon dioxide embolus
- (B) Endobronchial intubation
- (C) Hypoventilation
- (D) Inadvertent application of high levels of positive end-expiratory pressure
- (E) Leak in the capnography sampling catheter
The decreased duration of action of an intravenous dose of fentanyl compared with an intravenous dose of morphine is best explained by
- (A) greater lipid solubility
- (B) increased hepatic metabolism
- (C) less protein binding
- (D) shorter elimination half-life
- (E) smaller volume of distribution
Measurement of mixed expired carbon dioxide concentration is necessary for the determination of
- (A) dead space
- (B) lung-thorax compliance
- (C) physiologic shunt fraction
- (D) diffusing capacity of the lungs
- (E) ventilatory response to carbon dioxide
Compared with halothane, desflurane has which of the following characteristics?
- (A) Greater potency
- (B) A higher boiling point
- (C) Increased blood solubility
- (D) Less airway irritability
- (E) Less biodegradation
A patient with end-stage renal disease has prolonged ventilatory depression after administration of morphine. The most likely cause is increased
- (A) serum concentration of morphine-6-glucuronide
- (B) elimination half-life of morphine
- (C) opioid receptors
- (D) receptor affinity
- (E) volume of distribution
Which of the following can be used as a sole criterion for brain death?
- (A) Absence of cerebral blood flow
- (B) Absence of doll's eye movements
- (C) Fixed, dilated pupils
- (D) Isoelectric EEG
- (E) Unresponsiveness to all externally applied stimuli
In an adult undergoing laparotomy, which of the following is the most effective means of maintaining body temperature during the first hour of anesthesia?
- (A) Increasing ambient temperature
- (B) Using a warming blanket
- (C) Warming inspired gases
- (D) Warming intravenous fluids
- (E) Warming irrigating fluids
The illustration depicts flow-volume loops for the same person at two different times in his life. Which of the following is indicated by the dotted loop?
- (A) Bronchial tumor
- (B) Chronic asthmatic bronchitis
- (C) Morbid obesity
- (D) Paralysis of a vocal cord
- (E) Subglottic stenosis
You are called to anesthetize a patient for an emergency pericardial window for a large pericardial effusion. Which of the following drugs is most appropriate for initiation of anesthesia?
- (A) Alfentanil
- (B) Ketamine
- (C) Midazolam
- (D) Propofol
- (E) Thiopental
Which of the following best reflects findings of inadequate cerebral perfusion during carotid cross clamping?
- (A) Decreased frequency on EEG
- (B) Increased latency of brain stem auditory evoked potentials
- (C) Increased spectral edge frequency
- (D) Jugular bulb oxygen tension of 27 mmHg
- (E) Stump pressure of 50 mmHg