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References: Laxative

Pediatr Surg Int. 1998 Nov;14(1-2):66-70.
Distributions of substance P- and VIP-immunoreactive nerve fibres in the colonic circular muscle in children.

Uemura S, Hurley MR, Hutson JM, Chow CW.

F. Douglas Stephens Surgical Laboratory and Department of Anatomical Pathology, Royal Childrens Hospital, Melbourne, Australia.

In children with severe chronic constipation, abnormal distribution of substance P (SP) and vasoactive intestinal peptide (VIP), which represent excitatory and inhibitory nerves, respectively, has been reported. The normal distribution of these neuropeptides, however, is not well known. The aim of this study was to determine the populations of SP- and VIP-immunoreactive nerve fibres in the circular muscle of the colon in children. Surgically resected specimens were collected from a 6-year-old girl with familial polyposis coli (total colon) and nine patients with anorectal malformations aged 0-4 years (sigmoid colon). Double-labelling immunofluorescence was employed using neuron-specific enolase (NSE) with SP and NSE with VIP to count the percentage of SP- or VIP-labelled nerve fibres. These specimens showed normal submucous and myenteric plexuses stained with NSE. The population of SP- immunoreactive fibres was 15%-21% throughout the colon, and VIP was 39% in the caecum and 63%-65% in the transverse, descending, and sigmoid colon. In the four neonatal specimens (day 1 to 4), the SP population was only 1%-6% and the VIP population was also low (22%-33%). After 3 weeks of age, the populations had stabilised at 18%-26% for SP and 52%-62% for VIP. SP-immunoreactive nerve fibres were scarce in the neonatal period, and showed a rapid increase by 3 weeks and a similar though less dramatic increase in VIP-immunoreactive fibres. VIP-immunoreactive fibres were fewer in the caecum that at other colonic levels, where they accounted for 60% of NSE-labelled fibres; the SP population, however, was comparable at all levels of the colon at about 20% of NSE-labelled fibres.

Laxative online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9880700&dopt=Abstract constipation laxative colon cleansing

Dig Dis Sci. 1998 Dec;43(12):2719-26.
Cholinergic stimulation and nonadrenergic, noncholinergic relaxation of human colonic circular muscle in idiopathic chronic constipation.

Mitolo-Chieppa D, Mansi G, Rinaldi R, Montagnani M, Potenza MA, Genualdo M, Serio M, Mitolo CI, Rinaldi M, Altomare DF, Memeo V.

Department of Pharmacology and Human Physiology and Institute of Clinical Surgery, Medical School, University of Bari, Italy.

The aim of our study was to further investigate the pathophysiological mechanism underlying idiopathic chronic constipation (ICC), a disorder of colonic motility. A possible alteration of excitatory and inhibitory neurotransmission and also the role of inhibitory neurotransmitters such as nitric oxide (NO), 5'-adenosine triphosphate (ATP), and vasoactive intestinal peptide (VIP) has been evaluated on preparations of distal colon from patients with or without ICC. The isometric tension was recorded from isolated circular muscle strips of both experimental groups during pharmacological and electrical field stimulation (EFS). The contractile response obtained by acetylcholine (ACh 20 microM), EFS (20 Hz, 20 V, 1 msec, pulse trains lasting 1 min) and substance P (SP 1 microM) was significantly lower in ICC than in control preparations. The effect of inhibitory nonadrenergic, noncholinergic innervation was evaluated using EFS at low frequencies (0.5-8 Hz), after cholinergic and sympathetic blockade with atropine (3 microM) and guanethidine (3 microM). The maximum relaxation value expressed as percentage of inhibition of SP-induced contraction was significantly higher in ICC than in control preparations (87+/-2.4 and 67+/-6.3, respectively; P<0.05). Experiments with substances that antagonize or reduce the effect of putative inhibitory mediators (VIP 6-28, apamin and N(G)-nitro-L-arginine) suggest that an alteration in NO and ATP release is present in ICC preparations. In particular at a higher inhibitory frequency NO-mediated relaxation is enhanced in ICC vs control,

Radiology. 1999 Jan;210(1):103-8.
Defecographic study of rectal evacuation in constipated patients and control subjects.

Karlbom U, Nilsson S, Pahlman L, Graf W.

Department of Surgery, Akademiska sjukhuset, Uppsala, Sweden.

PURPOSE: To validate a computer-based area calculation method of quantification of rectal evacuation by using defecography videotapes and to use that method to compare evacuation in constipated patients with that in control subjects. MATERIALS AND METHODS: For validation of the method, simultaneous defecography and weight measurements were compared in 36 patients with constipation or incontinence. Evacuation was calculated as the rate of change of the contrast medium-covered rectal area (percentage per second) or of the evacuated amount of contrast medium (percentage per second [relative] and grams per second [absolute]). After method validation, from a series of 215 consecutive constipated patients, individuals with an isolated radiologic diagnosis of intussusception greater than 0.6 cm (n = 27), rectocele greater than 2 cm (n = 19), enterocele (n = 12), or paradoxic puborectal muscle contraction (n = 12) were selected. Rectal evacuation in these groups was compared with that in 30 control subjects. RESULTS: Rectal evacuation rates measured at defecography correlated well with weighed amounts of evacuated contrast medium during the initial and total evacuation periods in 21 patients without contrast medium leak (r = 0.92, P < .001). Constipation overall, a rectocele greater than 2 cm, or paradoxic puborectal muscle contraction were associated with impaired evacuation (P < .001). CONCLUSION: Area calculations of rectal evacuation reflect rectal emptying. A rectocele greater than 2 cm or a paradoxic puborectal muscle contraction may be associated with obstructed defecation.

Laxative online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9885594&dopt=Abstract constipation laxative colon cleansing

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