title: Development of reference intervals for the large intestinal transit of radiopaque markers in dogs.
abstract: Ten healthy dogs were fed 30 1.5 mm and 10 5 mm radiopaque markers (BIPS, MedID, Grand Rapids) mixed with sufficient quantities of a high fibre diet to meet 25% of their estimated daily caloric requirements. Abdominal radiographs were made at two hour intervals until 90% of the small and large markers had left the colon. The mean residence times (MRT) of each size of marker in the proximal, distal and total colon were calculated using kinetic analysis. The MRT's of the small markers were 4.9 hours (SD 4.4), 7.1 hours (SD 3.3) and 12.0 hours (SD 7.1) respectively. The MRT's of the large markers were not significantly different from the small markers except in the proximal colon where they were significantly shorter (3.2 hours, SD 2.3). Reference colonic filling and colonic transit curves for both sizes of markers were constructed. These may be useful to detect abnormal colonic transit in dogs.
authors.affiliation: Institute of Veterinary Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand.
authors.forename: S J
authors.initials: SJ
authors.lastname: Bruce
authors.forename: W G
authors.initials: WG
authors.lastname: Guilford
authors.forename: D I
authors.initials: DI
authors.lastname: Hedderley
authors.forename: M
authors.initials: M
authors.lastname: McCauley
mesh_terms: D000284:Administration, Oral; D000818:Animals; D003106:Colon / Q000000981:diagnostic imaging*; D003287:Contrast Media / Q000008:administration & dosage*; D004285:Dogs; D005260:Female; D005772:Gastrointestinal Transit; D008297:Male; D011859:Radiography; D012015:Reference Standards; D013997:Time Factors
chemical_list: D003287:Contrast Media