10 Random Questions
In performing a diagnostic left lumbar sympathetic block for lower extremity claudication, the tip of the needle ideally should lie at point
- (A) A
- (B) B
- (C) C
- (D) D
- (E) E
Which of the following statements concerning the ventilatory effects of inhalational anesthesia is true?
- (A) Assisted ventilation is not an effective technique to achieve normocarbia
- (B) Surgical stimulation does not affect ventilation
- (C) Combined doses of nitrous oxide and isoflurane depress ventilation the same as an equipotent dose of isoflurane alone
- (D) The ventilatory response to increasing carbon dioxide concentration is normal
- (E) The ventilatory response to hypoxemia is preserved
Which of the following is most effective in preventing intraoperative hypothermia in adults?
- (A) Heating and humidifying inspired gases
- (B) Maintaining a warm operating room
- (C) Using a circulating warm-water mattress
- (D) Using reflective coverings
- (E) Warming intravenous fluids
After brachial plexus block, a patient has sensation over the inner aspect of the upper arm. Block of which of the following nerves would obtund this sensation?
- (A) Intercostobrachial
- (B) Median
- (C) Musculocutaneous
- (D) Radial
- (E) Ulnar
Halothane anesthesia is usually associated with an increase in
- (A) cardiac contractility
- (B) venous capacitance
- (C) arterial pressure
- (D) venous return
- (E) heart rate
An 8-year-old child with chronic renal failure is scheduled for an operation to create an arteriovenous fistula. Laboratory studies include: Hemoglobin 6.5 g/dl, Blood gases (breathing air) : PaO2 97 mmHg, PaCO2 29 mmHg, pH 7.30 Sodium 129 mEq/L Potassium 5.5 mEq/L Chloride 101 mEq/L Bicarbonate 15 mEq/L. Before inducing general anesthesia, which of the following abnormalities should be corrected?
- (A) Anemia
- (B) Metabolic acidosis
- (C) Potassium concentration
- (D) Anemia, metabolic acidosis, and potassium concentration
- (E) None of the above
Nitroprusside therapy for hypertension should be discontinued in the presence of
- (A) acute myocardial infarction
- (B) increasing metabolic acidosis
- (C) methemoglobinemia
- (D) mitral regurgitation
- (E) renal failure
To detect the delivery of hypoxic gas mixture, the optimal location for an oxygen analyzer in this circle is
- (A) 1
- (B) 2
- (C) 3
- (D) 4
- (E) 5
Fentanyl-induced bradycardia is
- (A) independent of the speed of injection
- (B) independent of dose
- (C) caused by direct inhibition of adrenal catecholamine release
- (D) caused by vagal stimulation
- (E) caused by direct SA node depression
A previously healthy, 60-kg, 17-year-old boy is undergoing emergency surgery for a gunshot wound involving the iliac vein. Ventilation is controlled with a tidal volume of 700 ml/breath, rate of 10/min, and peak inspiratory pressure of 30 cmH2O. Body temperature is normal. The most likely cause of an end-tidal carbon dioxide partial pressure of 16 mmHg is
- (A) endobronchial intubation
- (B) excessive expiratory time
- (C) excessive tidal volume
- (D) low cardiac output
- (E) pulmonary aspiration