Reliability of ultrasonography compared to radiography in revealing intestinal sand accumulations in horses.

This research article investigated the reliability of using ultrasonography for detecting intestinal sand accumulations in horses, comparing it to traditional radiography. The study showed that ultrasonography is a practical and reliable tool, though it cannot entirely replace radiography.

Study Design and Procedure

• The researchers examined the cranioventral parts of the abdomen of 32 horses that were showing signs suggestive of gastrointestinal sand.
• Both radiographic and ultrasonographic examinations were performed on each horse.
• The amount and location of sand relative to the ventral abdominal wall were evaluated through radiography and graded on a scale of 0-4.
• The motility of the intestine and whether it was lying against the ventral abdominal wall were examined using ultrasonography. The findings were summed and graded on a scale of 0-3 to express the likelihood of sand presence.

Findings

• The grades obtained from radiographic and ultrasonic examinations were significantly associated.
• Out of 14 horses with a moderate or large sand accumulation determined via radiography, 92.9% had positive ultrasonographic results.
• Of the 8 horses with no signs of sand accumulation through radiography, 87.5% were also negative on the ultrasonographic exam.
• Small and more dorsally located sand accumulations were difficult to detect with ultrasonography.
• For horses with a small or moderate amount of sand placed ventrally or only a small part of sand close to the ventral abdominal wall, 70% were positive for sand ultrasonographically.
• Ultrasonographic examination revealed a hyperechoic ventral aspect of sand accumulations, varying acoustic shadowing, and decreased or absent intestinal motility.

General Observations

• Overall, the study has shown that ultrasonography is a reliable technique for detecting sand accumulations in horses.
• The specific nature of ultrasonographic findings, characterized by hyperechoic ventral aspects and varying acoustic shadowing, allows for a trustworthy identification of sand presence.
• The sensitivity and specificity of ultrasonography in detecting sand accumulations were found to be 87.5% each, suggesting a high degree of reliability.
• However, the ultrasonographic technique was found to be less effective at detecting smaller or more dorsally located sand accumulations.

Limitation and Conclusion

• One of the limitations of ultrasonography was that it offered limited information on the height of the sand accumulations.
• Despite its practicality and reliability, ultrasonography is not seen as a replacement for radiography as it still has limitations in detecting some sand accumulations.