Rheological properties of the dog pyloric sphincter.
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Animals↗
Biomedical subjects
B Persoz
Publications and source records attributed to B Persoz.
[Rheological properties of the terminal intestine in Hirschsprung's disease].
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Biomechanical Phenomena↗
[The elasticity co-efficient of the rectal wall (E.C.R.P.). A prognostic test for Hirschsprung's disease (author's transl)].
In a situation where all authors are agreed on the significant morbidity of a colostomy in Hirschsprung's disease, the new test described by the authors would appear to help, if not "resolve" the always difficult choice between a colostomy and simple nursing in the intermeditary treatment of Hirschsprung's disease of the newborn.
Defecation↗
Response of the anal canal to repeated distension of the rectum.
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Anal Canal↗
Viscoelastic properties of the rectal wall in Hirschsprung's disease.
Viscoelastic properties of the rectal wall were compared with Hirschsprung's disease. The elasticity of the rectal wall after accomodation to distension was found to be significantly greater (P less than 0.001) in patients, and the time taken by the rectum to accomodate was also found to be longer (P less than 0.001). The increased elasticity correlated well with severity of the illness, but none of the parameters correlated with length of aganglionic segment. Measuring elastic properties of the rectal wall may help to assess the severity of illness in patients with Hirschsprung's disease.
Adolescent↗
Relationship between viscoelastic properties of the rectum and anal pressure in man.
Viscoelastic properties of the rectal wall and anal sphincter pressure were studied simultaneously in 25 normal children. During rectal distension for 60 s, with varying volumes of air, the rectal pressure varied as the sum of two exponential functions of the time plus an asymptotic constant. A rectoanal inhibitory reflex was elicited during these distensions. The exponential decrease of the rectal pressure corresponded exactly to the return of the upper anal canal pressure to the resting value in some subjects. In others, the upper anal canal remained relaxed as long as the rectal ampulla was distended, except with smaller volumes. The results obtained may be explained by an analogical rheological linear model.
Anal Canal↗
Segmental colonic transit time.
Mean segmental transit time of radiopaque markers through the right colon, left colon and rectosigmoid areas of adults and children has been calculated form their distribution on consecutive plain films of the abdomen. Overall mean transit does not differ significantly in the large bowel between adults and children. However, there are regional differences within the colon in relation to age. Mean transit time in the right colon is 13.8 hours in adults and 7.7 in children (p less than 0.01). Corresponding values in the left colon are 14.1 and 8.7 hours (p less than 0.02) and, in the rectum, 11 and 12.4 hours (p = NS). The percentage of the mean total large bowel transit time spent in the right colon, left colon and rectosigmoid area are respectively for adults and children 33 +/- 4 and 28 +/- 3 per cent (p = NS); 39 +/- 4 and 32 +/- 4 per cent (p = NS); and 28 +/- 4 and 41 +/- 4 per cent (p less than 0.05), indicating a relative stagnation in the rectosigmoid area of children. These physiologic differences may have implications in diseased states.
Adolescent↗