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Abstract

Objective—To determine whether ultrasonography would be useful in the diagnosis of right dorsal colitis in horses.

Design—Retrospective study.

Animals—5 horses with right dorsal colitis and 15 healthy adult horses.

Procedure—Mural thickness and appearance of the right dorsal colon were determined from ultrasonographic images obtained at right intercostal spaces 10, 11, 12, 13, and 14.

Results—The right dorsal colon could be imaged most consistently at the right 11th, 12th, and 13th intercostal spaces, below the margin of the lung and axial to the liver. Mural thickness measured from ultrasonographic images was significantly greater in horses with right dorsal colitis than in healthy horses. The right dorsal colon in affected horses had a prominent hypoechoic layer associated with submucosal edema and inflammatory infiltrates. Successful treatment of 1 horse with right dorsal colitis was associated with a decrease in mural thickness coincident with an increase in serum albumin and total protein concentrations and weight gain. A decrease in mural thickness was also observed in a second horse treated for right dorsal colitis that was not associated with healing of the right dorsal colon or an increase in serum albumin concentration but rather thinning of a segment of the right dorsal colon that eventually ruptured.

Conclusions and Clinical Relevance—Results suggest that ultrasonographic measurement of mural thickness and evaluation of the appearance of the right dorsal colon may be useful in the diagnosis of right dorsal colitis in horses. (J Am Vet Med Assoc 2003;222:1248–1251)

Full access
in Journal of the American Veterinary Medical Association

A lthough acute and severe colic is recognized as a common cause of death in horses, 1 chronic or recurrent colic is also a life-threatening disease that can be difficult to diagnose and treat. 2 Right dorsal colitis is a well-known but poorly

Open access
in American Journal of Veterinary Research

volvulus, right dorsal colitis, colitis/diarrhea, and colonic impactions. 7 Of particular interest to this research study is right dorsal colitis, which is induced by NSAID treatment, and in a segment of colon capable of anion secretion that is inhibited

Open access
in American Journal of Veterinary Research

mucosa of the large colon (ie, right dorsal colitis). These effects have subsequently been reported by several other groups. 4–7 The specific time frame and mechanism of action of phenylbutazone toxicosis in equids remain unclear, especially as it

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in American Journal of Veterinary Research

adverse effects has not been widely published. The adverse effects of NSAIDs as a class of drugs have been determined. These include gastric and colonic ulcers, right dorsal colitis, impaction of the large colon, cecal impaction and rupture, and renal

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in American Journal of Veterinary Research

, Escherichia fergusonii , and Enterococcus faecium (group D). Fecal culture of the right dorsal colon retrieved a mixed culture resembling normal flora. Morphologic Diagnosis and Case Summary NSAID drug toxicosis (right dorsal colitis, renal papillary

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in Journal of the American Veterinary Medical Association

scenario would be detrimental whether the owner opted for surgical intervention or euthanasia. 13 The use of ultrasonography to aid in the diagnosis of right dorsal colitis has also been reported and is widely known among equine practitioners. 17

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in Journal of the American Veterinary Medical Association

, both of which can be associated with effects on the gastrointestinal tract, such as gastric ulcers and right dorsal colitis. 4–6 In other species, opioids, including fentanyl, buprenorphine, and morphine, are commonly used as analgesics for animals

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in American Journal of Veterinary Research

, right dorsal colitis that results from the toxic effects of nonsteroidal antiinflammatory drugs, and intussusceptions. 1,2 Ultrasonography can be used for evaluation of the diameter and wall thickness of the small intestines and to assess wall thickness

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in Journal of the American Veterinary Medical Association

significant, and the diarrhea was not associated with other expected signs of right dorsal colitis secondary to toxic effects of NSAID administration, such as hypoalbuminemia and thickening of the wall of the right dorsal colon. The diarrhea was also transient

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in American Journal of Veterinary Research