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Biomedical subjects

V S Chadwick

Publications and source records attributed to V S Chadwick.

At least 91 records · Page 5Linked to original sources
PubMed1982

Indium-111 autologous leucocyte scanning: comparison with radiology for imaging the colon in inflammatory bowel disease.

Indium-111 autologous leucocyte scanning was compared with barium enema for assessing the extent of colonic disease in Crohn's colitis and ulcerative colitis. Scanning was shown to be as accurate as conventional radiology in colitis, reliably distinguishing active from inactive disease. The results suggest that 111In-leucocyte scanning is an accurate, non-invasive, alternative technique for imaging the extent of disease in colitis.

Colitis, Ulcerative↗
PubMed1982

Pharmacological inhibition of chenodeoxycholate-induced fluid and mucus secretion and mucosal injury in the rabbit colon.

The effects of various pharmacological agents on bile acid-induced fluid secretion, mucus secretion, and mucosal injury were investigated using a perfusion technique in rabbit colon. Atropine markedly reduced and carbachol potentiated the fluid secretion, mucus output, and mucosal damage observed during bile acid perfusion. In contrast, pretreatment of the colonic mucosa with lignocaine and parenteral administration of methysergide and somatostatin produced a modest reduction in the fluid secretory response without apparent effects on mucus output or mucosal damage. These results suggested that cholinergic agonists and antagonists influence the mucosal resistance to bile acid-induced injury possibly through their effects on mucus secretion. Increasing or decreasing mucosal resistance to the detergent effects of bile acids appeared to have marked effects on the magnitude of induced fluid secretion. A minor reduction in overall secretory response to bile acids was also apparent with agents not influencing mucus secretion or mucosal injury.

Animals↗
PubMed1982

Enteral therapy in the management of massive gut resection complicated by chronic fluid and electrolyte depletion.

Following combined resection of small and large bowel, fluid and electrolyte depletion may necessitate chronic intravenous therapy. We report two such patients who were dependent upon thrice weekly intravenous electrolyte infusions to maintain body weight and urine output. The patients were maintained on a diet aimed at minimizing intestinal fluid losses but nevertheless were in severe negative sodium and water balance. Metabolic studies were performed to evaluate the efficacy of oral glucose electrolyte therapy in reversing negative sodium and water balance. Fluid and electrolyte homeostasis was achieved with isotonic glucose, or glucose polymer, electrolyte sipping solutions which enabled both patients to become independent of parenteral therapy.

Body Weight↗
PubMed1982

Large and small forms of cholecystokinin in human plasma: measurement using high pressure liquid chromatography and radioimmunoassay.

Defining the role of cholecystokinin (CCK) in gut physiology and disease has proved difficult because of problems with development of radioimmunoassays and because CCK exists in several different molecular forms which have different biological actions. In order to measure small (8 amino acid residues, CCK 8) and large (33 and 39 residues) forms of CCK in plasma we have developed high pressure liquid chromatographic (HPLC) fractionation of plasma prior to radioimmunoassay. Fasting plasma CCK 8 and CCK 33/39 levels were usually undetectable (less than 3 and less than 6 pmol/1, respectively). After a liquid fat meal both CCK 8 and CCK 33/39 levels were significantly elevated at 5 min (11.3 +/- 3.3 and 11.6 +/- 2.6 pmol/1, respectively). Peak CCK 8 levels occurred at 30 min (15.0 +/- 4.4 pmol/1) while peak CCK 33/39 levels occurred at 120 min (16.7 +/- 4.9 pmol/1). Total CCK levels showed a biphasic response to the meal. These CCK 8 and CCK 33/39 responses to oral fat are consistent with a role for these hormones in the regulation of gallbladder emptying and pancreatic secretion.

Cholecystokinin↗
PubMed1982

Duodenal perfusion with sodium taurocholate inhibits biliary but not pancreatic secretion in man.

1. A standard duodenal perfusion technique was used to study the effects of luminally perfused sodium taurocholate on basal and stimulated biliary and pancreatic secretion and gastrointestinal hormone release in man. 2. During duodenal perfusion with sodium taurocholate alone, both basal and caerulein/secretin-stimulated bilirubin secretion were suppressed. A successive perfusion with a mixture of the bile salt and essential amino acids in combination overcame the biliary suppression and biliary secretion rose above basal levels. A further increase in bilirubin secretion was not observed in a subsequent perfusion with essential amino acids alone in these studies. 3. No inhibitory effect on basal or caerulein/secretin-stimulated trypsin secretion was observed during the bile salt perfusion; basal trypsin secretion was in fact slightly increased during a prolonged (4 h) perfusion of the bile salt. 4. During bile salt perfusion, basal bicarbonate secretion remained unchanged but caerulein/secretin-stimulated bicarbonate secretion was slightly increased. 5. Plasma levels of pancreatic polypeptide, gastric inhibitory peptide and gastrin did not change significantly during duodenal perfusion with bile salt, but plasma levels of motilin were suppressed. 6. These results support the view that bile salts in the duodenum may regulate biliary and pancreatic secretion in man and affect plasma levels of motilin.

Adult↗
PubMed1982

Effects of duodenal perfusion with sodium taurocholate on biliary and pancreatic secretion in man.

The effects of intraluminal sodium taurocholate (STC) on biliary and pancreatic secretion were studied in man using a duodenal perfusion technique and indocyanine green (ICG) as an exogenous biliary marker. Duodenal perfusion with 15 or 30 mmol/l STC in healthy subjects markedly suppressed caerulein and secretin stimulated biliary indocyanine green (ICG) excretion in a dose responsive manner, i.e. to 40% (17-95%, +/- 2 SD, n = 5) (P less than 0.025) and 32% (26-38%, +/- 2 SD, n = 3) (P less than 0.003) of i.v. ICG infusion, respectively, with a maximum suppression to 26% and 10%, respectively. In cholecystectomized subjects (n = 5), significant changes in ICG excretion were not observed during STC (15 mmol/l) perfusion. There were no suppressive effects on pancreatic enzyme or bicarbonate secretion in any of the subjects. Our observations suggest that the bile salts STC in the duodenum in man activated a mechanism which selectively suppressed biliary excretion. This is probably due to relaxation of the gallbladder and an increase in gallbladder storage of bile.

Adult↗
PubMed1982

Serum levels of C-reactive protein in Crohn's disease and ulcerative colitis.

Prospective measurements were made of serum C-reactive protein levels and erythrocyte sedimentation rate in sixty-four patients with Crohn's disease and fifty with ulcerative colitis. The results were related to clinical assessment of disease activity. C-reactive protein levels were raised in both groups but were significantly higher in Crohn's disease than ulcerative colitis for all categories of disease severity: with mild disease the median and range of C-reactive protein concentration were 4, 0-65 mg/l in Crohn's disease v. 0, 0-15 mg/l in ulcerative colitis, P less than 0.01; in moderate disease the values were 15, 1-100 mg/l v. 3, 0-29 mg/l respectively, P less than 0.05 and in cases of severe disease, 85, 15-183 mg/l v. 12, 2-33 mg/l respectively, P less than 0.001. Erythrocyte sedimentation rate was also higher in Crohn's disease but did not closely reflect disease activity in individual patients. C-reactive protein levels corresponded closely with clinical and pathological indices of relapse, remission and response to therapy in patients with Crohn's disease. The precise assay of serum C-reactive protein provides an objective criterion of inflammatory activity, which may be useful in the assessment, management and study of Crohn's disease.

Adolescent↗
PubMed1982

Enumeration of lymphocyte populations defined by surface markers in the whole blood of patients with Crohn's disease.

The proportions and absolute numbers of different lymphocyte populations were determined using alkaline phosphatase-labelled reagents in the whole peripheral blood of 22 patients with Crohn's disease. Monoclonal mouse anti-T cell antibody (OKT3) was used to identify T cells, polyvalent F(ab')2 anti-human immunoglobulin for B cells, C3b for C3b-receptor bearing cells, and soluble IgG antibody-antigen complexes for Fc(gamma)-receptor bearing cells. Endogenous myeloperoxidase served to distinguish monocytes. Application of this methodology to whole blood avoids the inevitable loss of cells which accompanies separation of mononuclear cells from blood and therefore permits precise enumeration of lymphocyte populations in the circulation. No significant difference from healthy adult controls was observed in any of the lymphocyte subsets tested.

Adult↗
PubMed1982

Systemic inflammatory complications following jejuno-ileal bypass.

The clinical and laboratory features of three patients with systemic inflammatory complications following jejuno-ileal bypass surgery for morbid obesity are described. The constellation of an asymmetrical polyarthritis, tenosynovitis, sterile skin pustules, mucous membrane ulceration and retinal vasculitis resembled Behçet's syndrome. Serum complement levels were normal and circulating immune complexes not regularly detected, although hypocomplementaemia, elevations in Clq and rheumatoid factor binding materials were noted prior to clinical relapse in one patient. Antibiotic therapy proved disappointing, whereas dapsone produced a sustained remission. Bacterial overgrowth was not invariably found which together with recurrence of symptoms following bypass reversal, suggest that bacteria may only be required to initiate, not perpetuate inflammatory complications.

Arthritis↗
PubMed1981

Effects of vasoactive intestinal peptide and pancreatic polypeptide in rabbit intestine.

The effects of porcine vasoactive intestinal peptide (VIP) and bovine pancreatic polypeptide (PP) on jejunal, ileal, and colonic fluid transport were studied in the rabbit. VIP produced secretion in the small intestine (jejunum greater than ileum) but did not affect absorption in the colon. PP had no secretory effects in jejunum, ileum, or colon. The small intestinal secretion induced by VIP was not associated with raised cAMP concentrations in the mucosa; this suggests that the secretory effects of VIP in vivo are mediated by a mechanism other than stimulation of adenylate cyclase.

Animals↗
PubMed1981

Hymenolepiasis: an unusual cause of diarrhoea in Western Europe.

A young Indian man presented in England with a 6-month history of diarrhoea which started just before leaving India. He was found to have tropical enteropathy and H. nana infestation, but while the infestation and symptoms disappeared with antihelminthic treatment, the tropical enteropathy persisted. Hymenolepiasis is not well recognised as a cause of diarrhoea amongst Asians in Western Europe.

Adult↗
PubMed1981

Periportal sinusoidal dilatation, inflammatory bowel disease, and the contraceptive pill.

Two women, aged 19 and 28 yr, who had been on the contraceptive pill for at least 18 mo, developed abnormal levels of circulating liver enzymes, minimal hepatomegaly, and elevated erythrocyte sedimentation rate. Liver biopsy in both women showed a sinusoidal dilatation sparing the perihepatic venous regions. The liver function abnormality resolved on stopping the pill. Both patients also had clinically mild inflammatory bowel disease. The possibility of both liver and bowel abnormalities being effects of contraceptive steroids is discussed.

Adult↗