References: Laxative
Proc Soc Exp Biol Med. 2000 Jul;224(3):147-51.
Differential effects of maturation on nicotinic- and muscarinic receptor-induced ion secretion in guinea pig distal colon.
Powell AR, Reddix RA.
Department of Pharmacology and Experimental Therapeutics, Louisiana State University Health Sciences Center, New Orleans, Louisiana 70112, USA.
The incidence of constipation increases with age. This has been linked to age-related changes in the structure and function of myenteric neurons regulating intestinal motility; however, the role of submucous neurons is unknown. The aim of this study was to determine the effect of maturation on cholinergic receptor-induced ion secretion in guinea pig colon. Changes in the short-circuit current (Isc) and tissue conductance were monitored in muscle-stripped colonic segments from young (3-4-month-old) and mature (12-15-month-old) male guinea pigs. Thirty-one percent of colonic segments from young guinea pigs exhibited ongoing neural activity, which was absent in mature animals. Baseline Isc was significantly higher only in young guinea pig tissues with ongoing activity. Tissue conductance was similar in all tissues. Electrical field stimulation caused a biphasic increase in the Isc. At 15 V/10 Hz, only Peak 1 was attenuated, whereas both peaks were reduced in mature guinea pigs at 10 V/5Hz. 1,1, dimethyl-4-phenyl-piperazinium(DMPP)-induced ion secretion was blunted in mature guinea pigs. Atropine reduced the 1,1, dimethyl-4-phenyl-piperazinium response only in young guinea pigs. Carbachol-induced ion secretion was similar in tissues from both age groups. In conclusion, nicotinic receptor-induced secretion mediated by both cholinergic and noncholinergic secretomotor neurons was blunted; however, epithelial muscarinic receptor activity was unaltered during maturation.
Laxative online source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10865229&dopt=Abstract constipation laxative colon cleansing
Ethn Health. 1999 Feb-May;4(1-2):39-49.
Racial differences in symptoms and complications in adults with type 2 diabetes mellitus.
Konen JC, Summerson JH, Bell RA, Curtis LG.
Department of Family Medicine, Carolinas Medical Center, Charlotte, NC 28232, USA.
OBJECTIVE: To compare the frequency of common symptoms and complications between African- and white American adults with type 2 diabetes mellitus in a primary care setting, and to examine associations of these conditions with glycemic control. DESIGN: Three hundred and four adults with type 2 diabetes participated in this cross-sectional analysis; 142 of whom were African-Americans. Patients were recruited from a family practice ambulatory care unit and a community health center. RESULTS: Both male and female African-Americans had higher mean diastolic blood pressure and poorer metabolic control than their white counterparts. After adjustment for diabetes duration, glycosylated hemoglobin and diastolic blood pressure, African-American females were significantly more likely to experience constipation and hypertension but less likely to experience chest pain, claudication, peripheral neuropathy or have peripheral vascular disease. Among male subjects, African-Americans were significantly more likely to experience blurred vision and hypertension but less likely to have peripheral atherosclerotic disease. Poor glycemic control was more strongly associated with the occurrence of common diabetic symptoms in African-American subjects. CONCLUSIONS: Both African- and white Americans with type 2 diabetes are likely to experience a wide variety of symptoms and vascular complications. African-American subjects appear more likely than whites to experience symptoms related to glycemic control but less likely to have, or experience symptoms and complications of, cardiovascular disease. That nearly half of these subjects seen in a primary care setting had microalbuminuria suggests that vascular complications are likely to be present in the majority of ad
Am J Gastroenterol. 2000 Jun;95(6):1439-47.
Gastrointestinal symptoms and subjects cluster into distinct upper and lower groupings in the community: a four nations study.
Talley NJ, Holtmann G, Agreus L, Jones M.
Department of Medicine, University of Sydney, Nepean Hospital, Penrith, New South Wales, Australia.
OBJECTIVE: It is unknown whether distinct functional GI (GI) symptom groupings occur in the general population and whether these are similar across different cultures. Although symptom-based diagnostic criteria have been developed for upper and lower GI syndromes (the Rome criteria), the classification is controversial. We aimed to identify whether independent symptom-based subgroups exist in four countries consistent with the Rome criteria. METHODS: Random samples of the community were mailed a validated questionnaire based on the Bowel Disease Questionnaire in Rochester, MN (n = 2,220), in Sydney, Australia (n = 1,135), and in Essen, Germany (n = 500). A different validated questionnaire was mailed to a random sample in Osthammar, Sweden (n = 1,517). Only the common questions (n = 22) were used in the current analysis, and these were essentially identical in wording. The underlying structure of the item responses was examined using factor analysis. Initial factors were extracted using principal components analysis and then rotated using Varimax. Clustering of symptoms among individuals was examined though cluster analysis, using the factors as the basis for clustering. RESULTS: Response rates varied from 64% to 80%; responders and nonresponders were similar sociodemographically. All four studies yielded similar factor structures. All countries reported symptom groupings consistent with the irritable bowel syndrome (IBS), dyspepsia and/or gastroesophageal reflux, and constipation; all except Sweden also had a diarrhea group. The cluster analysis yielded slightly more disparate results but a healthy group was present in all populations. All four populations had an IBS and/or bowel dysfun
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