10 Random Questions
During laser microsurgery of the larynx using an endotracheal tube, a fire occurs in the airway. Which of the following is the most appropriate initial management?
- (A) Increase FiO2 to 1.0
- (B) Instill saline into the endotracheal tube
- (C) Perform cricothyroidotomy
- (D) Remove the endotracheal tube
- (E) Ventilate with air
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
After weaning from cardiopulmonary bypass following mitral valve replacement, a patient's cardiac output is reported to be 3.7 L/min measured by thermodilution technique using 5% dextrose in water 10 ml at room temperature as injec-tate. This value could be falsely high if
- (A) normal saline solution were mistakenly used
- (B) the patient's hematocrit were still 25%
- (C) only 9.0 ml of injectate were used
- (D) atrial fibrillation were present
- (E) the room were excessively cold
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
Severe nausea and vomiting in the PACU is most effectively treated with a drug that acts as an antagonist at which of the following receptors?
- (A) Alpha-adrenergic
- (B) Beta-adrenergic
- (C) Dopamine
- (D) GABA
- (E) Glutamate
A patient develops jaundice one week after undergoing laparoscopic cholecystectomy during halothane anesthesia. Laboratory studies show an increased serum alkaline phosphatase concentration, a mildly increased serum aspartate aminotransferase concentration, and a markedly increased conjugated bilirubin fraction. Which of the following is the most likely diagnosis?
- (A) Biliary obstruction
- (B) Gilbert's disease
- (C) Halothane-associated hepatitis
- (D) Hematoma resorption
- (E) Infectious hepatitis
Which of the following is the most likely cause of the rapid onset of local anesthesia when sodium bicarbonate is added to lidocaine?
- (A) Decreased extracellular calcium ion concentration
- (B) Increased extracellular pH
- (C) Increased intracellular pH
- (D) Increased ionized lidocaine diffusion
- (E) Increased nonionized lidocaine concentration
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
Which of the following time concentration curves would be expected in arterial blood following intravenous injection of indocyanine green dye in a 3-year-old child with a small ventricular septal defect?
An 88-kg man is anesthetized with 66% nitrous oxide, 33% oxygen, and 1% isoflurane using a circle system. Following tracheal intubation, the nitrous oxide flow is set at 1 L/min and the oxygen flow is set at 0.5 L/min. After two hours the oxygen monitor indicates a circuit oxygen concentration of only 25% despite the flows noted above. The most likely explanation for this discrepancy is
- (A) decrease of oxygen pipeline pressure to 20 psi
- (B) increase in the concentration of nitrous oxide in the circuit
- (C) inaccuracy of flowmeters at low flow rates
- (D) malfunction of the oxygen monitor
- (E) progressive hypothermia