VTNE Anesthesia Management Questions and Answers — Questions and Answers
Question 1: A 6-year-old cat under isoflurane anesthesia for a dental cleaning has a consistent capnograph reading of 55 mmHg. What is the most appropriate immediate action for the veterinary technician to take?
- Increase the isoflurane percentage.
- Administer a bolus of intravenous fluids.
- Assist ventilation by gently squeezing the reservoir bag. (Correct answer)
- Check the patient's rectal temperature.
Correct answer: Assist ventilation by gently squeezing the reservoir bag.
An end-tidal CO2 (ETCO2) reading of 55 mmHg indicates hypercapnia, meaning the patient is hypoventilating and not effectively eliminating carbon dioxide. The normal range is 35-45 mmHg. The most direct and immediate action is to assist the patient's ventilation to help them "blow off" the excess CO2 and lower the level back into the normal range.
Question 2: Which component of the anesthetic machine is specifically designed to absorb exhaled carbon dioxide in a rebreathing circuit?
- The vaporizer
- The oxygen flowmeter
- The soda lime canister (Correct answer)
- The pop-off valve
Correct answer: The soda lime canister
The soda lime canister contains granules (such as soda lime or other absorbents) that chemically react with and remove carbon dioxide from the exhaled gases. This allows the patient to safely rebreathe the remaining gases, including oxygen and anesthetic vapor, conserving heat, moisture, and anesthetic agent.
Question 3: Which of the following anesthetic induction agents is well-known for causing a transient period of apnea, especially when administered as a rapid intravenous bolus?
- Ketamine
- Propofol (Correct answer)
- Tiletamine-zolazepam (Telazol®)
- Diazepam
Correct answer: Propofol
Propofol is a rapid-acting injectable anesthetic that commonly causes dose- and rate-dependent respiratory depression, which can manifest as apnea immediately following induction. Technicians should be prepared to intubate and provide positive pressure ventilation if necessary after its administration.
Question 4: An 8-year-old Poodle with a history of congestive heart failure and a significant heart murmur is scheduled for a mass removal. According to the American Society of Anesthesiologists (ASA) physical status classification system, which grade is most appropriate for this patient?
- ASA I
- ASA II
- ASA IV (Correct answer)
- ASA V
Correct answer: ASA IV
The ASA physical status classification system grades a patient's pre-anesthetic risk. An ASA IV classification is for a patient with severe systemic disease that is a constant threat to life. A dog with decompensated heart disease fits this category, signifying a high anesthetic risk that requires advanced planning and monitoring.
Question 5: The Minimum Alveolar Concentration (MAC) of an inhalant anesthetic is a standard measure used to compare which characteristic of different agents?
- The speed of induction and recovery
- The potency of the anesthetic agent (Correct answer)
- The degree of cardiovascular depression
- The percentage of the drug metabolized by the liver
Correct answer: The potency of the anesthetic agent
Minimum Alveolar Concentration (MAC) is the standard measure of an inhalant anesthetic's potency. It is defined as the concentration of the vapor in the lungs needed to prevent movement in 50% of subjects in response to a painful stimulus. A lower MAC value indicates a more potent anesthetic.
Question 6: A 5-kg cat is anesthetized using a non-rebreathing circuit. Fifteen minutes into the procedure, the technician notes the patient's rectal temperature has dropped significantly. Which factor is the most likely primary contributor to this rapid heat loss?
- The high flow rate of cool, dry gas required by the circuit. (Correct answer)
- The administration of an opioid as a premedication.
- The thermal conductivity of the stainless steel surgical table.
- The clipping of the patient's fur for the surgical prep.
Correct answer: The high flow rate of cool, dry gas required by the circuit.
Non-rebreathing circuits require high fresh gas flow rates to flush out exhaled carbon dioxide. This high flow of un-warmed, non-humidified gas from the oxygen source causes significant evaporative and convective heat loss from the patient's respiratory tract, making it a primary contributor to perioperative hypothermia, especially in small patients.
VTNE Anesthesia Management Questions and Answers
A 6-year-old cat under isoflurane anesthesia for a dental cleaning has a consistent capnograph reading of 55 mmHg.
What is the most appropriate immediate action for the veterinary technician to take?