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Ultrasonographic assessment of the rate of solid-phase gastric emptying in dogs
  1. A. F. Chalmers1,
  2. R. Kirton1,
  3. C. A. Wyse, BA, MSc, PhD1,
  4. A. Dickie, BVMS, MVM, DVR, DipECDVI, MRCVS2,
  5. D. Cumming, BEng, PhD, CEng3,
  6. J. M. Cooper, BSc, MSc, PhD, FIEE, FInstP, FRSE, FREng3,
  7. T. Preston, BSc, PhD4 and
  8. P. S. Yam, BSc, BVM&S, CertSAM, PhD, MRCVS1
  1. 1Department of Companion Animal Studies
  2. 2Department of Preclinical Veterinary Studies, Institute of Comparative Medicine, University of Glasgow Veterinary School, Bearsden, Glasgow G61 1QH
  3. 3Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow G12 8LT
  4. 4Scottish Universities Environmental Research Centre, Scottish Enterprise Technology Park, East Kilbride G75 0QF


Twelve healthy dogs were used in an ultrasonographic assessment of the effect of the composition of a solid meal on the rate of gastric emptying. The dogs were fasted for nine hours before they were fed either a standard or a high energy density test meal, in a cross-over study design. The gastric antrum was visualised with a 6·5 MHz microconvex transducer, and the area inside the elliptical shape defined by the craniocaudal and ventrodorsal diameters of the stomach was measured. Antral images were acquired at regular intervals for six hours after the ingestion of the test meal. Three indices to describe the rate of gastric emptying were computed: the gastric half-emptying time (t1/2), the time to 50 per cent maximal antral area (t50%), and the time of maximal antral area (tmax). The values of t50% and t1/2 calculated for the high energy density meals were significantly longer than for the standard meals, but there was no significant difference between the tmax values.

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