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Whole Colon (whole + colon)

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Medical Sciences	100%

Selected Abstracts

Evaluation of gut motility in type II diabetes by the radiopaque marker method

JOURNAL OF GASTROENTEROLOGY AND HEPATOLOGY, Issue 4 2000
Motoyuki Iida
Abstract Background: The clinical usefulness of the radiopaque marker method for detecting diabetic gastrointestinal motility disturbances, was evaluated by examining 21 type II diabetes subjects who did not have any neuropathic symptoms. Methods: After administration of a Sitzmark capsule®, markers were located using plain abdominal radiographs, and the transit time of the markers through seven areas of digestive tract was calculated by Arhan's methods. The plasma concentration of acetaminophen at 45 min after oral administration was measured to evaluate gastric emptying time. The coefficient of variation of R-R intervals on the electrocardiograms (CVR-R) was measured to evaluate parasympathetic autonomic function. Results: In the diabetics, the average (± SD) transit time through upper digestive tracts was slightly but not significantly elongated compared with control subjects (14.4 ± 8.3 vs 9.9 ± 6.1 h). Significant elongation was observed in transit time through the lower digestive tracts or the whole gut (44.6 ± 20.9 and 57.9 ± 22.3 h, respectively) compared with control subjects (23.3 ± 8.5 and 33.2 ± 11.0 h). The transit time of the markers from stomach to small intestine was highly correlated (r = 0.693) with plasma concentration of acetaminophen. The transit time through either the whole colon (r = 0.564) or the whole gut (r = 0.630) was highly correlated with CVR-R. Conclusions: These findings suggest that the radiopaque marker method is a useful tool for detecting the sections of the digestive tract responsible for gut motility disturbances. In type II diabetics with no neuropathic symptoms, the lower digestive tracts may deteriorate prior to the impairment of upper digestive tracts. [source]

Calcitonin gene-related peptide facilitates serotonin release from guinea-pig colonic mucosa via myenteric neurons and tachykinin NK2/NK3 receptors

BRITISH JOURNAL OF PHARMACOLOGY, Issue 3 2004
Shu-ichi Kojima
The ability of calcitonin gene-related peptide (CGRP), to alter the outflow of 5-hydroxytryptamine (5-HT) from the guinea-pig proximal colon, was evaluated using three different isolated preparations: whole colon, mucosa-free muscle layer and submucosa/mucosa preparations. In the presence of the monoamine oxidase A inhibitor, clorgyline, CGRP elicited a concentration-dependent increase in 5-HT outflow from the whole colon, but not from mucosa-free muscle layer preparations. The CGRP-evoked 5-HT outflow was sensitive to tetrodotoxin (TTX) or hexamethonium, but was not detectable in submucosa/mucosa preparations. HCGRP8,37 (3 ,M) inhibited the submaximal effect of CGRP on the 5-HT outflow. [Cys(ACM)2,7]hCGRP had a slight stimulant influence on the 5-HT outflow. The selective NK2 and NK3 receptor antagonists, SR48968 or SR142801, respectively, prevented the enhancing effect of CGRP. By contrast, a selective NK1 receptor antagonist L703606, failed to block the effect of CGRP. The enhancing effect of CGRP was mimicked by the NK2 receptor agonist [, -Ala8]-neurokinin A (NKA)4,10 and the NK3 receptor agonist senktide. The effect of [, -Ala8]-NKA4,10 on the 5-HT outflow was unaffected by TTX, while the effect of senktide was prevented by TTX, hexamethonium or SR48968. The present data also demonstrated a synergistic action of the NK2 and NK3 receptor agonists on the CGRP-evoked 5-HT outflow. We concluded that CGRP facilitates 5-HT release from the guinea-pig colonic mucosa through an action on myenteric neurons and that this effect is mediated by endogenously released tachykinins, acting via tachykinin NK2/NK3 receptors in cascade. British Journal of Pharmacology (2004) 141, 385,390. doi:10.1038/sj.bjp.0705624 [source]

Rectal washout with cytotoxic solution can be extended to the whole colon

BRITISH JOURNAL OF SURGERY (NOW INCLUDES EUROPEAN JOURNAL OF SURGERY), Issue 12 2002
P. P. Mariani
Background: Rectal irrigation with a cytotoxic agent does not kill viable intraluminal cancer cells proximal to the primary tumour. To prevent implantation of these cells at the time of restorative proctectomy, the feasibility of retrograde whole-colon irrigation just before surgery was explored. Methods: The cytotoxic efficacy of different combinations of povidone,iodine (PVPI) and Gastrografin was tested with the trypan blue exclusion test on a human colon carcinoma cell line (SW620) in vitro. Subsequently, a retrograde whole-colon lavage with PVPI 5 per cent and Gastrografin 12 per cent was performed in 14 euthyroid, non-allergic patients with colorectal cancer using a colostomy irrigation set. Thyroid function and mucosal damage were assessed. Results: It took 2 min and approximately 1 litre of infused solution to reach the caecum in all patients. The solution was 100 per cent tumoricidal in vitro and remained so after colonic irrigation. Total serum tri-iodothyronine (T3) levels decreased and those of reverse T3 increased, but normalized after 1 week. Superficial epithelial desquamation was observed shortly after irrigation; however, complete restoration occurred within 7 days. Conclusion: A rectal washout can easily be extended to a retrograde irrigation of the whole colon in elective colorectal cancer surgery. This may help to prevent anastomotic and local recurrence due to implantation of viable exfoliated tumour cells. © 2002 British Journal of Surgery Society Ltd [source]