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Background  The prevalence of gastric emptying ( GE ) disorders in cats is unknown due to lack of clinically applicable diagnostic tests.    Objectives  The principal aim of this study was to assess correlation between scintigraphic and ultrasonographic measurements of  GE  time ( GET ) in healthy cats. Additionally, variability of ultrasonographic  GET , and correlation between scintigraphy and ultrasonographic parameters of gastric motility were evaluated.    Animals  Eight healthy domestic shorthair cats.    Methods  Prospective study. Scintigraphic  GET  was determined using a solid test meal containing 4  mC i  99m Tc‐mebrofenin. Each cat had 3 separate ultrasonographic assessments of  GE , performed independent of scintigraphic assessment, after solid test meal consumption. The motility index ( MI ) of antral contractions was plotted against time and time for each fraction of the area under the  MI  curve determined. Ultrasonographic  GET  and  MI  were correlated to scintigraphic  GET .    Results  Scintigraphic  GET  (mean ±  SD ) for 25, 50, and 75%  GE  was 103 ± 32 minutes, 196 ± 45 minutes, and 288 ± 62 minutes, whereas sonographic  GET  for 25, 50, and 75%  GE  was 106 ± 13 minutes, 203 ± 19 minutes, and 305 ± 27 minutes. There was good correlation between scintigraphic and sonographic  GET  ( r  = 0.72–0.82) at 45–90% fractional  GE  and between scintigraphic  GET  and time of corresponding  MI  curve fraction ( r  = 0.78–0.86) at 40–90% fraction of the  MI  curve. There was moderate intraindividual variability for sonographic  GET  and  MI  curve fraction times as well as significant variation among individuals.    Conclusions and clinical importance  Ultrasonography is a valid alternative to scintigraphy for assessment of solid‐phase  GE  and allows assessment of postprandial gastric motility in healthy cats.

Validation of Ultrasonography for Assessment of Gastric Emptying Time in Healthy Cats by Radionuclide Scintigraphy