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References: Laxative

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BACKGROUND: Pathogenesis of slow transit constipation still remains elusive. Some studies have shown several colonic motor abnormalities; however, it is not easy to understand the relative importance of the single ones. AIMS: Since it has been hypothesized that an excess of periodic distal motor activity may be of pathophysiological importance in patients with slow transit constipation, we evaluated regular colonic contractile frequencies in a homogeneous cohort of these patients. PATIENTS: A total of 26 female patients (age range 34 to 67 years) fulfilling the Rome II criteria for constipation entered the study. No patient had evidence of secondary forms of constipation and distal obstruction. METHODS: Twenty-four hour colonic manometric studies were obtained for each patient. Regular contractile patterns (with frequencies ranging from 2 to 8 cycles/min) were calculated for the entire recording period and in single colonic segments. RESULTS: Overall, regular patterns accounted for about 3% of the total colonic motor activity (average 30 min/day per subject), with the 3 cycles/min being the predominant contractile rhythm. Most of this activity was present in the sigmoid colon, accounting for >50% of the total amount of motility, and it was more prevalent than in the descending and transverse colon; no differences were revealed in the descending with respect to the transverse colon. No daily fluctuations of regular contractile activity, nor a cyclic pattern, nor migration between recording points were observed. CONCLUSIONS: Regular colonic frequency patterns ar

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Int J Colorectal Dis. 1992 Dec;7(4):197-201.
Observations on the characteristics of stimulated defaecation in severe idiopathic constipation.

Kamm MA, van der Sijp JR, Lennard-Jones JE.

St Mark's Hospital, London, UK.

A combined manometric and radioisotope study is described which was designed to investigate the motility characteristics of induced defaecation in the colon, rectum and anal canal, in patients with severe constipation. Five women with severe idiopathic constipation, aged 30-45 years, were studied. A multiple channel water-perfused manometric tube was placed colonoscopically into either the whole colon or left colon to monitor pressure activity. In two whole-colon studies, 5.5 MBq 111In DTPA and later 9 MBq 99mTc DTPA were instilled into the colon to monitor the transit of colonic contents in response to two separate stimuli. Motor activity was initiated on both occasions by intraluminal instillation of 5.5 mg bisacodyl. In the whole-colonic studies a right colonic stimulus initiated multiple high-pressure peristaltic waves which traversed the entire length of the colon. The bowel was then refractory to a second stimulus at the splenic flexure. In the five left colonic studies, a stimulus at the splenic flexure produced high-pressure peristaltic waves which proceeded distally, and which included a rise in rectal pressure. The anal canal relaxed simultaneously with the onset of peristalsis high in the left colon, and remained relaxed until the pressure wave reached the anus and bowel content had been expelled. In both types of study high-pressure waves corresponded to the effective transport of radioisotope. The constipated patients showed a coordinated motor response to the stimulus.(ABSTRACT TRUNCATED AT 250 WORDS)

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1293240&dopt=Abstract

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Pediatr Pathol. 1992 May-Jun;12(3):385-95.
Microdissection study of the myenteric plexus in acardia, ataxia-telangiectasia, cystic fibrosis, extrahepatic biliary atresia, pediatric AIDS and Werdnig-Hoffmann disease.

Galvis DA, Ang SM, Wells TR, Landing BH, Romansky SG.

Department of Pathology and Laboratory Medicine, Childrens Hospital Los Angeles, California 90027.

Microdissection-point count morphometric study of the myenteric (Auerbach) plexus or esophagus, small intestine, and colon was done for infants and children with acardia (2), ataxia-telangiectasia (5), cystic fibrosis of the pancreas (CFP) (25), extrahepatic biliary atresia (EBA) (17), pediatric AIDS (10), and Werdnig-Hoffmann disease (WHD) (8). Values for fractional area of neural tissue in the plane of the plexus were compared to those of control patients in same age range as those in each disease category by t-test. Statistically abnormal values included low values for small intestine and colon in Werdnig-Hoffmann disease, high values for small intestine and colon in biliary atresia, and high value for colon but a low value for small intestine in cystic fibrosis. Values for all three loci were within the normal range for ataxia telangiectasia and pediatric AIDS. The mechanisms of the low value for small and large intestines in WHD, which causes chronic constipation as a result of skeletal muscle weakness, and of the high values for colon in CFP and EBA, both causing malabsorption with bulky stools, are unclear. The value for small intestine in acardia was normal for term but lower than expected for fetal bowel of the same size, possibly because of reduced neural crest inflow to the fetal bowel.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1409139&dopt=Abstract

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