Objective—To determine whether sensitivity of
detecting an anomalous portosystemic blood vessel
during operative mesenteric portography varied with
Animals—34 dogs with a portosystemic shunt diagnosed
via scintigraphy or surgery.
Procedure—Portograms were evaluated for a portosystemic
blood vessel. Sensitivity was calculated
from results obtained with dogs in left lateral, right lateral,
and dorsal recumbency and from results
obtained with dogs in 2 or 3 positions. Differences in
sensitivity among positions and between 2 examiners
Results—Sensitivity was 85, 91, and 100% in dorsal,
right lateral, and left lateral recumbency, respectively.
Sensitivity was lower in dorsal recumbency than in left
lateral recumbency, although differences were not significant.
There was no significant difference between
sensitivity of results obtained in dorsal and right lateral
recumbency or right lateral and left lateral recumbency.
Sensitivity for combined right lateral and dorsal
positions was 97%, which was better than that in dorsal
recumbency alone, although the difference was
not significant. Because sensitivity in left lateral
recumbency was 100%, there was no need to evaluate
the improvement obtained by combining the result
of this position with the results of other positions.
Conclusion and Clinical Relevance—Results of
mesenteric portography varied with patient positioning.
The optimal position varied among patients but
left lateral recumbency may be better and dorsal
recumbency worse. Sensitivity may be improved by
performing the test with the patient in orthogonal
recumbent positions. (J Am Vet Med Assoc 2001;