Question:
Characteristic ping sound on simultaneous auscultation and percussion in LDA can be heard over
Characteristic ping sound on simultaneous auscultation and percussion in LDA can be heard over
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Left-side ping = LDA, rumen gas cap, or pneumoperitoneum.
Right-side ping = RDA, abomasal volvulus, cecal dilation/torsion, or spiral colon gas.
Right-side ping = RDA, abomasal volvulus, cecal dilation/torsion, or spiral colon gas.
Updated On: Aug 13, 2026
- Upper third of 9th-12th ribs of left abdominal wall
- Lower third of 9th-12th ribs of left abdominal wall
- Upper third of 9th-12th ribs of right abdominal wall
- Lower third of 9th-12th ribs of right abdominal wall
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Left Displaced Abomasum (LDA) is a common metabolic disease of high-producing dairy cows, typically occurring during the early lactation period.
The abomasum displaces from its normal position on the right ventral abdominal floor to the left side, becoming trapped between the rumen and the left abdominal wall.
The accumulation of gas in the displaced abomasum creates a gas-fluid interface, which acts as a resonating chamber.
Detailed Explanation:
Simultaneous auscultation and percussion (often called "pinging") is the primary diagnostic technique for detecting displaced abomasum.
The clinician places a stethoscope over the rib cage and taps the abdominal wall with a finger or a plexor.
A high-pitched, metallic "ping" sound, similar to a dropping coin, is heard when percussing over a gas-filled organ in contact with the body wall.
In cases of LDA, this resonant ping is localized to the left side of the abdomen.
The sound is typically centered over the upper third of the left abdominal wall, extending across the area of the 9th to 12th ribs.
Pings on the right side of the abdomen would instead suggest Right Displaced Abomasum (RDA) or abomasal volvulus.
Step 2: Final Answer:
The diagnostic ping of LDA is heard over the upper third of the 9th-12th ribs on the left abdominal wall.
Left Displaced Abomasum (LDA) is a common metabolic disease of high-producing dairy cows, typically occurring during the early lactation period.
The abomasum displaces from its normal position on the right ventral abdominal floor to the left side, becoming trapped between the rumen and the left abdominal wall.
The accumulation of gas in the displaced abomasum creates a gas-fluid interface, which acts as a resonating chamber.
Detailed Explanation:
Simultaneous auscultation and percussion (often called "pinging") is the primary diagnostic technique for detecting displaced abomasum.
The clinician places a stethoscope over the rib cage and taps the abdominal wall with a finger or a plexor.
A high-pitched, metallic "ping" sound, similar to a dropping coin, is heard when percussing over a gas-filled organ in contact with the body wall.
In cases of LDA, this resonant ping is localized to the left side of the abdomen.
The sound is typically centered over the upper third of the left abdominal wall, extending across the area of the 9th to 12th ribs.
Pings on the right side of the abdomen would instead suggest Right Displaced Abomasum (RDA) or abomasal volvulus.
Step 2: Final Answer:
The diagnostic ping of LDA is heard over the upper third of the 9th-12th ribs on the left abdominal wall.
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