VTNE Anesthesia Management 5 — Questions and Answers
Question 1: Which of the following is the MOST accurate method to confirm correct endotracheal tube placement?
- Watching chest rise
- Auscultation of breath sounds bilaterally
- Capnography showing a normal waveform (Correct answer)
- Visualization of the tube passing through the larynx
Correct answer: Capnography showing a normal waveform
Capnography demonstrating a consistent CO2 waveform is the gold standard for confirming endotracheal intubation, as esophageal placement will not produce a waveform.
Question 2: A patient recovering from anesthesia is shivering. Why is postanesthetic shivering clinically significant?
- It indicates adequate pain control
- It increases oxygen consumption and cardiac workload (Correct answer)
- It confirms the patient is in a light plane of anesthesia
- It is a normal finding with no clinical consequence
Correct answer: It increases oxygen consumption and cardiac workload
Shivering significantly increases oxygen demand and metabolic rate, which can be dangerous in compromised cardiac or respiratory patients.
Question 3: Which drug is used to reverse benzodiazepine sedation in veterinary patients?
- Naloxone
- Atipamezole
- Flumazenil (Correct answer)
- Yohimbine
Correct answer: Flumazenil
Flumazenil is a competitive benzodiazepine antagonist at the GABA-A receptor that reverses sedation from diazepam or midazolam.
Question 4: A dog on isoflurane anesthesia has a mean arterial pressure (MAP) of 55 mmHg. Which intervention is the MOST appropriate first step?
- Administer furosemide
- Reduce the isoflurane concentration and provide an IV fluid bolus (Correct answer)
- Administer ketamine
- Increase the oxygen flow rate
Correct answer: Reduce the isoflurane concentration and provide an IV fluid bolus
Isoflurane causes dose-dependent vasodilation and hypotension; reducing its concentration while providing a fluid bolus addresses both the cause and the hemodynamic effect.
Question 5: What is the purpose of preoxygenation before anesthetic induction in dogs and cats?
- To reduce the dose of induction agent needed
- To extend the time before oxygen desaturation occurs if intubation is difficult (Correct answer)
- To increase tidal volume during induction
- To prevent the need for endotracheal intubation
Correct answer: To extend the time before oxygen desaturation occurs if intubation is difficult
Preoxygenation denitrogenates the functional residual capacity, increasing oxygen reserves and providing extra time for safe intubation before desaturation.
Question 6: Which of the following correctly describes the effect of hypothermia on drug metabolism during anesthesia?
- It accelerates hepatic enzyme activity
- It prolongs the duration of anesthetic drugs by slowing metabolism (Correct answer)
- It has no effect on drug pharmacokinetics
- It increases renal clearance of drugs
Correct answer: It prolongs the duration of anesthetic drugs by slowing metabolism
Hypothermia decreases hepatic enzyme activity and reduces blood flow, slowing drug metabolism and prolonging the action of anesthetic agents.
Question 7: During anesthesia, a patient's SpO2 reading suddenly drops to 85% but mucous membranes appear pink. What is the most likely cause of this discrepancy?
- True hypoxemia requiring immediate oxygen supplementation
- Pulse oximeter sensor artifact or poor probe placement (Correct answer)
- Carbon monoxide poisoning
- Anemia causing falsely low readings
Correct answer: Pulse oximeter sensor artifact or poor probe placement
A discrepancy between low SpO2 and normal clinical appearance often indicates probe malposition, movement artifact, or poor perfusion at the sensor site rather than true hypoxemia.
VTNE Anesthesia Management 5
Which of the following is the MOST accurate method to confirm correct endotracheal tube placement?