Small intestinal volvulus in 47 cows.

OBJECTIVE

To describe the findings, treatment, and outcome of small intestinal volvulus (SIV) in 47 cows.

ANIMALS AND PROCEDURE

Retrospective analysis of medical records. Comparison of the findings for 18 surviving and 29 non-surviving cows.

RESULTS

The most common abnormal vital signs were tachycardia (68.0%), tachypnea (59.6%), and decreased rectal temperature (51.1%). Signs of colic occurred in 66.0% of cows in the study. Rumen motility was reduced or absent in 93.6% of cows, and intestinal motility in 76.6%. Clinical signs on ballottement and/or percussion and simultaneous auscultation were positive on the right side in 78.7% of cows. Transrectal examination showed dilated small intestines in 48.9% of cows. The rectum contained little or no feces in 93.6% of cows. The principal laboratory abnormalities were hypocalcemia (74.1%), hypokalemia (73.8%), azotemia (62.8%), hypermagnesemia (61.6%), and hemoconcentration (60.0%). The principal ultrasonographic findings were dilated small intestines (87.1%) and reduced or absent small intestinal motility (85.2%). Forty-one of the 47 cows underwent right flank laparotomy and the SIV was reduced in 21 cows. When comparing the clinical and laboratory findings of 18 surviving and 29 non-surviving cows, the groups differed significantly with respect to severely abnormal general condition (16.7 37.9%), rumen stasis (22.2 79.3%), intestinal atony (16.7 48.3%), serum urea concentration (6.5 9.8 mmol/L), and serum magnesium concentration (0.98 1.30 mmol/L). In summary, 38.3% of the cows were discharged and 61.7% were euthanized before, during, or after surgery.

CONCLUSION AND CLINICAL RELEVANCE

An acute course of disease, little or no feces in the rectum, and dilated small intestines were characteristic of SIV in this study population.