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AAVSB Certification
VTNE Exam
AAVSB.VTNE.v2026-10-12.q316 Dumps

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Question 271

In brachycephalic dogs, extubation should not occur until what action can occur?

A.The dog's head is flexed forward
B.The cuff is fully inflated
C.The cuff is partially deflated
D.The dog lifts its head without help

Correct Answer: D

Due to their unique anatomy and increased likelihood of respiratory problems, extubation should not occur in brachycephalic breeds until the dog is able to lift its head on its own. If the tube is removed before this, it could increase the risk of damaging the dog's airway (aspiration) or cause an upper airway obstruction (elongated soft palate).
The remaining options are incorrect (with rare exceptions). Extubation should occur after the cuff is fully deflated, not before. The neck should be in an extended, not bent, position. If the cuff is left fully inflated or the neck is not extended, the patient's larynx or tracheal mucosa could be damaged.

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Question 272

What tissue comprises the majority of tooth volume?

A.Dentin
B.Bone
C.Cementum
D.Enamel

Correct Answer: A

Dentin constitutes the majority of a tooth. It lies just below the surface enamel layer and encases the pulp cavity. It is sensitive to pressure and temperature changes. It has a tubular structure that is porous to bacteria. Thus, once dentin is exposed, it should be assumed that the pulp cavity will eventually become infected.
Teeth are not composed of bone. Enamel forms the outer surface layer of the tooth crown. Cementum forms the outer surface layer of the tooth's root.

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Question 273

Which type of solution has an osmotic pressure higher than plasma?

A.Osmotic
B.Hypertonic
C.Isotonic
D.Hypotonic

Correct Answer: B

A hypertonic solution has an osmolality higher than plasma. Examples of hypertonic solutions include 3% and 7% hypertonic saline (NaCl). They aid in resuscitation by the expansion of vascular volume. Hypertonic saline can also be used to treat traumatic brain injuries due to its ability to decrease intracranial pressure while increasing blood volume and blood pressure.
Isotonic refers to an osmolality that is the same as plasma. Hypotonic refers to an osmolality lower than plasma. Osmotic refers to the concentration of a solution and does not describe the solution's pressure.

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Question 274

In a rebreathing circuit, calcium hydroxide removes which of the following substances?

A.Sevoflurane
B.CO2
C.Oxygen
D.Isoflurane

Correct Answer: B

In a rebreathing circuit, absorbent calcium hydroxide granules are used to passively remove CO2 from expired air before it is redelivered to the patient.
Both oxygen and administered inhalant gases are desired in the anesthetic circuit and only removed by the patient.

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Question 275

When preparing a coagulation test, it is critical that the correct ratio of blood to anticoagulant is used, or the test will provide erroneous results. What ratio and what anticoagulant is used for coag tests?

A.9:1 ratio of blood to EDTA
B.9:1 ratio of blood to trisodium citrate
C.1:9 ratio of blood to trisodium citrate
D.1:9 ratio of blood to EDTA

Correct Answer: B

Coagulation relates to the body's ability to clot blood. Clotting factors are found in plasma. We can assess these factors by a series of coagulation tests. Several require specific tubes and volumes of blood to give correct results.
Coagulation tests are very finicky and require precision when filling the blood tubes. Tubes usually have blue stoppers and contain trisodium citrate. The ratio needed of blood to anticoagulant is crucial to prevent false results. Filling needs to occur at 9 parts blood to 1 part trisodium citrate.
In addition to the proper citrate to blood ratio, the samples should be allowed to mix with the citrate for ≥ 5 minutes, but < 2 hours before the test is performed. Thus, it really is a test that should be performed in-house.

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