Question:
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: 24-48 hours of preanaesthetic fasting is recommended in large ruminants
Reason R: Fasting in ruminants increases the volume of saliva and more chances of regurgitation
In light of the above statements, choose the correct answer from the options given below
Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: 24-48 hours of preanaesthetic fasting is recommended in large ruminants
Reason R: Fasting in ruminants increases the volume of saliva and more chances of regurgitation
In light of the above statements, choose the correct answer from the options given below
Assertion A: 24-48 hours of preanaesthetic fasting is recommended in large ruminants
Reason R: Fasting in ruminants increases the volume of saliva and more chances of regurgitation
In light of the above statements, choose the correct answer from the options given below
Show Hint
Ruminants must always be fasted (24-48h) and have an endotracheal tube with an inflated cuff placed immediately to protect the airway from continuous salivation and passive regurgitation of rumen contents.
Updated On: Aug 13, 2026
- Both A and R are true and R is the correct explanation of A
- Both A and R are true but R is NOT the correct explanation of A
- A is true but R is false
- A is false but R is true
Show Solution
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
Ruminants present unique challenges during general anesthesia due to their massive rumen volume, continuous saliva production, and susceptibility to tympany (bloat) and aspiration pneumonia.
Step 2: Detailed Explanation:
Let us evaluate the physiological basis of pre-anesthetic fasting in ruminants:
- Assertion A: Fasting large ruminants (cattle/buffaloes) for 24-48 hours, alongside withholding water for 12-24 hours, is standard practice prior to general anesthesia.
This fasting is critical because it reduces the volume of the rumen, minimizing microbial fermentation and the risk of ruminal tympany (bloat).
Reducing rumen volume also decreases intra-abdominal pressure, improving diaphragmatic excursion and preventing passive regurgitation. Thus, Assertion A is correct.
- Reason R claims that fasting *increases* the volume of saliva and the chances of regurgitation.
This is false. Fasting does not increase salivary secretion or pre-dispose the animal to regurgitation; instead, it reduces the risk of active or passive regurgitation by decreasing ruminal pressure.
Salivation remains continuous and is managed clinically using position and endotracheal intubation.
Therefore, Assertion A is true but Reason R is false.
Step 3: Final Answer:
A is true but R is false.
Ruminants present unique challenges during general anesthesia due to their massive rumen volume, continuous saliva production, and susceptibility to tympany (bloat) and aspiration pneumonia.
Step 2: Detailed Explanation:
Let us evaluate the physiological basis of pre-anesthetic fasting in ruminants:
- Assertion A: Fasting large ruminants (cattle/buffaloes) for 24-48 hours, alongside withholding water for 12-24 hours, is standard practice prior to general anesthesia.
This fasting is critical because it reduces the volume of the rumen, minimizing microbial fermentation and the risk of ruminal tympany (bloat).
Reducing rumen volume also decreases intra-abdominal pressure, improving diaphragmatic excursion and preventing passive regurgitation. Thus, Assertion A is correct.
- Reason R claims that fasting *increases* the volume of saliva and the chances of regurgitation.
This is false. Fasting does not increase salivary secretion or pre-dispose the animal to regurgitation; instead, it reduces the risk of active or passive regurgitation by decreasing ruminal pressure.
Salivation remains continuous and is managed clinically using position and endotracheal intubation.
Therefore, Assertion A is true but Reason R is false.
Step 3: Final Answer:
A is true but R is false.
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