10 Random Questions
During general anesthesia, a patient has the acute onset of atrial fibrillation with rapid ventricular response and hypotension to 50 mmHg systolic. The most appropriate treatment is
- (A) cardioversion
- (B) digoxin
- (C) esmolol
- (D) ouabain
- (E) verapamil
Which of the following statements about thiopental is true?
- (A) Rapid uptake into maternal tissues limits its transfer to the fetus
- (B) Its short duration of action is due to its extensive binding to plasma proteins
- (C) Accumulation in fat leads to acute tolerance
- (D) Alkalinity of solution causes respiratory depression
- (E) Uptake into brain is slowed by respiratory acidosis
A healthy, but obese, 110-kg woman is scheduled for gastric stapling. Compared with that required at her ideal weight, the dose of thiopental required for anesthetic induction would likely be increased because of changes in
- (A) blood volume
- (B) muscle mass
- (C) circulation time
- (D) body fat
- (E) metabolic rate
Ten minutes after induction of anesthesia with thiopental and isoflurane but before incision, a patient's nasopharyngeal temperature has decreased to 35.4°C. Which of the following contributed most to this decrease in temperature?
- (A) Anesthesia-induced block of nonshivering thermogenesis
- (B) Failure to use a warming blanket
- (C) Infusion of room-temperature crystalloid
- (D) Inhalation of room-temperature gases
- (E) Mixing of peripheral and central blood
With acute carbon monoxide poisoning
- (A) P50 is decreased
- (B) Pa02 is decreased
- (C) arterial oxygen saturation is increased
- (D) oxygen-carrying capacity of blood is normal
- (E) 2,3-diphosphoglycerate concentration in erythrocytes is increased
A mechanically ventilated newborn infant is undergoing gastroschisis repair during halothane anesthesia. Based on the right radial artery catheter tracing shown, which of the following is the most appropriate conclusion?
- (A) The abdomen has not yet been incised
- (B) The anesthetic should be changed from halothane to isoflurane
- (C) The ductus arteriosus is still open
- (D) The infant is hypovolemic
- (E) The tidal volume is inadequate
For 30 minutes, a patient has been receiving oxygen 2 L, nitrous oxide 2 L, and halothane from an agent-specific vaporizer set at 1%. A mass spectrometer sampling gas from the patient's airway shows an end-tidal halothane concentration of 0.7%. The most likely explanation for this difference is
- (A) hyperventilation
- (B) low cardiac output
- (C) the second-gas effect
- (D) tissue solubility of halothane
- (E) vaporizer temperature less than 19°C
Desflurane at a stable alveolar concentration of 7%
- (A) causes bradycardia
- (B) decreases cerebrovascular resistance
- (C) degrades in soda lime
- (D) increases systemic vascular resistance
- (E) stimulates the respiratory centers
Arterial pressure in the radial artery is 155/70 mmHg measured by a correctly calibrated catheter-transducer system. At the same time aortic pressure is 140/75 mmHg using a high-fidelity catheter tip transducer. The most likely cause of this discrepancy is
- (A) a large amount of air in the dome of the radial artery transducer
- (B) coarctation of the aorta
- (C) peripheral vascular constriction produced by sympathetic stimulation
- (D) physiologic amplification of the wave form from the aorta to the radial artery
- (E) too high a frequency response in the catheter-transducer system
In the elderly, scopolamine-induced delirium is
- (A) absent with doses less than 0.4 mg
- (B) decreased by physostigmine
- (C) reversible with diazepam
- (D) reversible with pyridostigmine
- (E) similar to that produced by glycopyrrolate