10 Random Questions
As part of a preoperative evaluation, a patient had a thallium scan showing a 'cold spot' over the left ventricle that occurs with moderate exercise and disappears at rest. This most likely indicates
- (A) moderate-sized aneurysm of the left ventricle
- (B) acute myocardial ischemia
- (C) recent myocardial infarction
- (D) old myocardial infarction
- (E) Prinzmetal's variant angina
During an otherwise uneventful nitrous oxide-sevoflurane anesthetic in a spontaneously breathing patient, 85% nitrous oxide is accidently administered, resulting in a PO2 of 48 mmHg. Which of the following would be expected?
- (A) Tachycardia
- (B) Sweating
- (C) Tachypnea
- (D) Hyperactive EEG
- (E) None of the above
Which of the following will occur if the top of the oxygen flowmeter is cracked and leaking during anesthesia with nitrous oxide and oxygen?
- (A) The back-pressure check valve will protect against a hypoxic gas mixture
- (B) The fail-safe mechanism will protect against a hypoxic gas mixture
- (C) The inspired oxygen concentration will be less than that set by the flowmeters
- (D) The leak will be detected if the circle is pressurized prior to use
- (E) The rotameter will accurately reflect the fresh gas flow to the patient
The correlation between anesthetic potency and lipid solubility
- (A) suggests that the number of molecules dissolved at the site of action causes anesthesia
- (B) applies to anesthetic agents dissolved in olive oil
- (C) suggests that the type of molecule causes anesthesia
- (D) is consistent with the synergistic effect of anesthetics
- (E) is not consistent with a unitary molecular site of action of anesthetics
The five curves shown represent the uptake of enflurane, desflurane, halothane, isoflurane, and nitrous oxide. Which uptake curve best depicts desflurane?
- (A) Curve A
- (B) Curve B
- (C) Curve C
- (D) Curve D
- (E) Curve E
Gravid uterine blood flow is
- (A) autoregulated
- (B) decreased by normotensive epidural analgesia
- (C) decreased by uterine contractions
- (D) increased with an increase in maternal Pa02
- (E) unaffected by alpha-adrenergic agonists
A 70-year-old man who underwent bilateral carotid endarterectomies two years ago is to undergo anesthesia and surgery. The denervation of the carotid bodies is likely to result in
- (A) chronic respiratory alkalosis
- (B) decreased ventilatory response to hypoxemia
- (C) increased ventilatory response to hypercarbia
- (D) labile hypertension
- (E) resting bradycardia
A 30-year-old woman underwent emergency cesarean delivery under general anesthesia at 36 weeks' gestation because of preeclampsia. Two hours after the operation, she is still intubated and apneic and cannot be aroused. Deep tendon reflexes are 1+. With mechanical ventilation at an FiO2 of 0.4, PaO2 is 130 mmHg, PaCO2 is 32 mmHg, pH is 7.45, and base excess is -0.6. The most likely cause is
- (A) hypovolemic shock
- (B) intracerebral hemorrhage
- (C) nitroprusside toxicity
- (D) overdose of magnesium sulfate
- (E) pituitary necrosis
Initiation of positive pressure mechanical ventilation is LEAST likely to decrease cardiac output in patients with which of the following conditions?
- (A) Abdominal distention with decreased lung volume
- (B) Acute cardiogenic pulmonary edema
- (C) Chronic obstructive pulmonary disease
- (D) Flail chest following an automobile accident
- (E) 20% Right pneumothorax
Which of the following statements concerning the check valve of the common gas outlet on an anesthesia gas machine is true?
- (A) It prevents backflow into vaporizers
- (B) It prevents delivery of a hypoxic mixture
- (C) It prevents rebreathing
- (D) It is located downstream from the oxygen flush valve
- (E) It is required for proper functioning of the proportioning system