VTNE Veterinary Anesthesia 4 — Questions and Answers
Question 1: A patient under anesthesia has a mean arterial pressure (MAP) of 48 mmHg. Which intervention should be attempted FIRST?
- Administer dopamine CRI
- Reduce the anesthetic agent concentration (Correct answer)
- Administer epinephrine IV bolus
- Increase fresh gas flow rate
Correct answer: Reduce the anesthetic agent concentration
Reducing the inhalant anesthetic concentration is the first step since most inhalants cause dose-dependent cardiovascular depression; this is the most direct corrective action.
Question 2: Which nerve block technique would be MOST appropriate to provide dental analgesia for a maxillary canine tooth extraction in a dog?
- Infraorbital nerve block (Correct answer)
- Mental nerve block
- Mandibular nerve block
- Retrobulbar block
Correct answer: Infraorbital nerve block
The infraorbital nerve block desensitizes the maxillary teeth (rostral to the 4th premolar) and surrounding tissues, making it ideal for maxillary canine extraction.
Question 3: What is the significance of a 'vaporizer out of circuit' (VOC) arrangement compared to a 'vaporizer in circuit' (VIC) arrangement?
- VOC vaporizers require no carrier gas flow
- VOC vaporizers deliver more precise, flow-independent concentrations (Correct answer)
- VIC vaporizers are safer for large animals
- VOC vaporizers work only with ether
Correct answer: VOC vaporizers deliver more precise, flow-independent concentrations
Out-of-circuit (VOC) vaporizers use a precision variable bypass design that delivers accurate agent concentrations independent of fresh gas flow rate.
Question 4: A rabbit is anesthetized and becomes apneic. Which route is MOST appropriate for emergency drug administration if IV access is not available?
- Subcutaneous
- Intramuscular
- Intraosseous (Correct answer)
- Intracardiac
Correct answer: Intraosseous
The intraosseous (IO) route provides rapid access to the systemic circulation in emergencies when IV access cannot be established, delivering drugs with similar speed to IV.
Question 5: Which of the following describes the Guedel classification Stage III, Plane 2 of anesthesia?
- Excitement, breath-holding, and struggling
- Loss of consciousness with retained reflexes
- Surgical anesthesia with regular respiration and loss of palpebral reflex (Correct answer)
- Respiratory arrest with fixed dilated pupils
Correct answer: Surgical anesthesia with regular respiration and loss of palpebral reflex
Stage III, Plane 2 represents surgical anesthesia characterized by regular respiration, loss of the palpebral reflex, and absent response to surgical stimulation.
Question 6: Which crystalloid fluid is MOST commonly recommended as the standard maintenance fluid during routine anesthesia in dogs and cats?
- 5% Dextrose in water (D5W)
- 0.9% Normal saline
- Lactated Ringer's solution (LRS) (Correct answer)
- 3% Hypertonic saline
Correct answer: Lactated Ringer's solution (LRS)
Lactated Ringer's solution is the most commonly recommended balanced isotonic crystalloid for routine anesthetic maintenance fluid therapy in small animals.
Question 7: During anesthetic monitoring, a technician observes the jaw tone becoming very loose and the eye rotating ventrally. What plane of anesthesia does this indicate?
- Light plane — increase anesthetic depth
- Appropriate surgical plane (Correct answer)
- Dangerously deep plane — reduce anesthetic immediately
- Recovery phase
Correct answer: Appropriate surgical plane
In most species, ventral eye rotation combined with absent jaw tone and palpebral reflex indicates an appropriate surgical plane of anesthesia.
VTNE Veterinary Anesthesia 4
A patient under anesthesia has a mean arterial pressure (MAP) of 48 mmHg.
Which intervention should be attempted FIRST?