Upper gastrointestinal haemorrhage.
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Aged↗
Biomedical subjects
D M Chalmers
Publications and source records attributed to D M Chalmers.
Mycophenolate mofetil in refractory inflammatory bowel disease.
BACKGROUND: Mycophenolate mofetil has been claimed to be effective and well tolerated in refractory inflammatory bowel disease although there is little information regarding its use in clinical practice. AIM: To review our experience in achieving and maintaining remission in refractory inflammatory bowel disease and to document tolerability, major toxicity and efficacy. METHODS: A retrospective audit was performed of the records of all patients with inflammatory bowel disease treated with mycophenolate mofetil (1-2 g/day) over a 3-year period. RESULTS: Thirty-nine patients were identified. Almost all had been intolerant of, or had not responded to azathioprine, and 38 were steroid-dependent. mycophenolate mofetil was discontinued in 22 patients, 11 due to intolerance and 10 because of lack of efficacy. Of the 17 on treatment at the end of the study period 16 were in remission and off all steroid therapy, but one needed infliximab to maintain remission. No major toxicity was noted and there was no major sepsis. CONCLUSIONS: Approximately 40% of patients with severe refractory inflammatory bowel disease achieved remission and complete steroid withdrawal on mycophenolate mofetil therapy, almost 30% could not tolerate the drug, and a further 30% did not respond. Mycophenolate mofetil therapy may have a role for steroid-dependent patients refractory to azathioprine.
Adolescent↗
The effect of Helicobacter pylori infection on levels of DNA damage in gastric epithelial cells.
BACKGROUND: Helicobacter pylori infection leads to an increased risk of developing gastric cancer. The mechanism through which this occurs is not known. We aimed to determine the effect of H. pylori and gastritis on levels of DNA damage in gastric epithelial cells. METHODS: Epithelial cells were isolated from antral biopsies from 111 patients. DNA damage was determined using single cell gel electrophoresis and the proportion of cells with damage calculated before and 6 weeks after eradication of H. pylori. Cell suspensions generated by sequential digestions of the same biopsies were assayed to determine the effect of cell position within the gastric pit on DNA damage. RESULTS: DNA damage was significantly higher in normal gastric mucosa than in H. pylori gastritis [median (interquartile range) 65% (58.5-75.8), n = 18 and 21% (11.9-29.8), n = 65, respectively, p <.001]. Intermediate levels were found in reactive gastritis [55.5% (41.3-71.7), n = 13] and H. pylori negative chronic gastritis [50.5% (36.3-60.0), n = 15]. DNA damage rose 6 weeks after successful eradication of H. pylori[to 39.5% (26.3-51.0), p =.007] but was still lower than in normal mucosa. Chronic inflammation was the most important histological factor that determined DNA damage. DNA damage fell with increasing digestion times (r = -.92 and -.88 for normal mucosa and H. pylori gastritis, respectively). CONCLUSIONS: Lower levels of DNA damage in cells isolated from H. pylori infected gastric biopsies may be a reflection of increased cell turnover in H. pylori gastritis. The investigation of mature gastric epithelial cells for DNA damage is unlikely to elucidate the mechanisms underlying gastric carcinogenesis.
Adolescent↗
Dietary antioxidants and DNA damage in patients on long-term acid-suppression therapy: a randomized controlled study.
Free radicals and reactive species produced in vivo can trigger cell damage and DNA modifications resulting in carcinogenesis. Dietary antioxidants trap these species limiting their damage. The present study evaluated the role of vitamins C and E in the prevention of potentially premalignant modifications to DNA in the human stomach by supplementing patients who, because of hypochlorhydria and possible depletion of gastric antioxidants, could be at increased risk of gastric cancer. Patients undergoing surveillance for Barrett's oesophagus (n 100), on long-term proton pump inhibitors were randomized into two groups: vitamin C (500 mg twice/d) and vitamin E (100 mg twice/d) for 12 weeks (the supplemented group) or placebo. Those attending for subsequent endoscopy had gastric juice, plasma and mucosal measurements of vitamin levels and markers of DNA damage. Seventy-two patients completed the study. Plasma ascorbic acid, total vitamin C and vitamin E were elevated in the supplemented group consistent with compliance. Gastric juice ascorbic acid and total vitamin C levels were raised significantly in the supplemented group (P=0.01) but supplementation had no effect on the mucosal level of this vitamin. However, gastric juice ascorbic acid and total vitamin C were within normal ranges in the unsupplemented group. Mucosal malondialdehyde, chemiluminescence and DNA damage levels in the comet assay were unaffected by vitamin supplementation. In conclusion, supplementation does not affect DNA damage in this group of patients. This is probably because long-term inhibition of the gastric proton pump alone does not affect gastric juice ascorbate and therefore does not increase the theoretical risk of gastric cancer because of antioxidant depletion.
Achlorhydria↗
Flat and depressed colonic neoplasms: a prospective study of 1000 colonoscopies in the UK.
BACKGROUND: Flat and depressed colorectal tumours were originally thought to be unique to the Japanese population. Recently there have been reports of flat and depressed lesions in western countries but they have been thought to be uncommon. METHODS: In this prospective study, 1000 consecutive patients attending for routine colonoscopy were examined for flat or depressed lesions. The examinations were done by one European colonoscopist using methods developed in Japan. FINDINGS: 321 adenomas were found: 202 (63%) were polypoid, 36% (117) were flat and 2 (0.6%) appeared depressed. Most adenomas contained areas of mild or moderate dysplasia but 10% (31) were severely dysplastic. Six Dukes' A adenocarcinomas were identified together with 25 more advanced adenocarcinomas. The likelihood of Dukes' A cancer or severe dysplasia increased from 4% (3/70) in small flat lesions, to 6% (9/154) in small polyps, 16% (8/50) in larger polyps, 29% (14/49) in large flat lesions, and 75% (3/4) in depressed lesions. 54% (20/37) lesions containing severe dysplasia or Dukes' A carcinoma were flat or depressed. INTERPRETATION: The polyp-carcinoma hypothesis prompts colonoscopists to search only for polypoid lesions when screening for cancer, and many early colorectal neoplasms may therefore be missed. Colonoscopists require training in the recognition of flat and depressed lesions to detect colorectal tumours in the early stages.
Adenocarcinoma↗
Non-pathogenic Escherichia coli versus mesalazine for the treatment of ulcerative colitis: a randomised trial.
BACKGROUND: Ulcerative colitis has been suggested to be caused by infection and there is circumstantial evidence linking Escherichia coli with the condition. Our aim was to find out whether the administration of a non-pathogenic strain of E. coli (Nissle 1917) was as effective as mesalazine in preventing relapse of ulcerative colitis. We also examined whether the addition of E. coli to standard medical therapy increased the chance of remission of active ulcerative colitis. METHODS: This was a single-centre, randomised, double-dummy study in which 120 patients with active ulcerative colitis were invited to take part. 116 patients accepted; 59 were randomised to mesalazine and 57 to E. coli. All patients also received standard medical therapy together with a 1-week course of oral gentamicin. After remission, patients were maintained on either mesalazine or E. coli and followed up for a maximum of 12 months. A two-stage, conditional, intention-to-treat analysis was done. FINDINGS: 44 (75%) patients in the mesalazine group attained remission compared with 39 (68%) in the E. coli group. Mean time to remission was 44 days (median 42) in the mesalazine group and 42 days (median 37) for those treated with E. coli. In the mesalazine group, 32 (73%) patients relapsed compared with 26 (67%) in the E. coli group. Mean duration of remission was 206 days in the mesalazine group (median 175) and 221 days (median 185) in the E. coli group. INTERPRETATION: Our results suggest that treatment with a non-pathogenic E. coli has an equivalent effect to mesalazine in maintaining remission of ulcerative colitis. The beneficial effect of live E. coli may provide clues to the cause of ulcerative colitis.
Adult↗
The effectiveness of screening and treating Helicobacter pylori in the management of dyspepsia.
AIMS: (1) To investigate the effects of a Helicobacter pylori screening and treatment strategy on open access endoscopy referral rates in dyspeptic patients aged < 40 years. (2) To determine the effectiveness of an H. pylori screening and treatment strategy, compared with endoscopy, in reducing dyspeptic symptoms, and in the utilization of dyspepsia related health care in general practice. SUBJECTS: Subjects were dyspeptic patients aged < 40 years, who were not taking NSAIDs and were without sinister symptoms. Patients were referred by their general practitioners. METHODS: The proportion of endoscopies carried out in patients aged < 40 years during the 5 years before the introduction of a screening and treatment strategy was compared with the proportion 2 years afterwards, as determined in a retrospective audit. Dyspepsia scores were obtained from unselected endoscopy patients and those who received a 13C-urea breath test (13C-UBT) at their initial visit and 6 months later. The number of visits made by patients with dyspepsia to their GPs, as well as the number of prescriptions given for antisecretory drugs, during the 6 months before attending for investigation were compared, in the same patient groups, with the same variables during the 6 months after the investigation. RESULTS: There was a 37% reduction in open access endoscopies performed in patients aged < 40 years (95% CI, 34-40%) following the introduction of the 13C-UBT service. Six months after attending the 13C-UBT service there was a significant fall in dyspepsia score (15.5 +/- 7.4 to 7.2 +/- 7.0, P < 0.0001), general practice dyspepsia consultations (2.0 +/- 1.3 to 1.0 +/- 1.7, P < 0.0001), H2 receptor antagonist prescription (14.2 +/- 32.6 tablets to 6.7 +/- 25.6 tablets, P = 0.006) but not proton pump inhibitor prescription (6.9 +/- 21.9 tablets to 7.2 +/- 27.6 tablets, P = 0.90). These changes were not significantly different from those found in the open access endoscopy control patients. CONCLUSIONS: An H. pylori screening and treatment strategy reduces the endoscopy workload in young dyspeptic patients. This strategy appears to be as effective as endoscopy in reducing dyspepsia symptoms, dyspepsia consultation rates and the prescribing of anti-secretory drugs.
Adult↗
Granulocyte apheresis in inflammatory bowel disease: possible mechanisms of effect.
We have studied the effects of granulocyte apheresis in 18 patients with ulcerative colitis and 6 with Crohn's disease who had failed to respond to conventional therapy. Patients were treated with weekly apheresis using a granulocyte removal column (GI, Otsuka Pharmaceutical Co., Ltd., London, U.K.). We found a mean reduction in circulating granulocytes of 1.29 x 10(9) cells/L with no significant alterations in red blood cell monocyte, total lymphocyte, absolute T-helper, or T-cytotoxic lymphocyte counts. There were no significant changes in complement levels or immunoglobulin subclasses. There was a significant increase in granulocyte adhesion and a reduction in L-selectin expression. The removal of granulocytes is unlikely to explain the effect of granulocytapheresis. The markedly increased expression of alpha(m) integrin/Mac-1 and low L-selectin expression alter the capability of granulocytes to migrate to sites of inflammation and may be responsible for the improvement observed in patients treated with granulocyte apheresis.
Adult↗
Reactive oxygen species activity and lipid peroxidation in Helicobacter pylori associated gastritis: relation to gastric mucosal ascorbic acid concentrations and effect of H pylori eradication.
BACKGROUND: Helicobacter pylori is an independent risk factor for gastric cancer, and this association may be due to the bacterium causing reactive oxygen species mediated damage to DNA in the gastric epithelium. High dietary ascorbic acid intake may protect against gastric cancer by scavenging reactive oxygen species. AIMS: To assess reactive oxygen species activity and damage in gastric mucosa in relation to gastric pathology and mucosal ascorbic acid level, and to determine the effect of H pylori eradication on these parameters. PATIENTS: Gastric biopsy specimens were obtained for analysis from 161 patients undergoing endoscopy for dyspepsia. METHODS: Reactive oxygen species activity and damage was assessed by luminol enhanced chemiluminescence and malondialdehyde equivalent estimation respectively. Ascorbic acid concentrations were measured using HPLC. RESULTS: Chemiluminescence and malondialdehyde levels in gastric mucosa were higher in patients with H pylori gastritis than in those with normal histology. Successful eradication of the bacterium led to decreases in both parameters four weeks after treatment was completed. Gastric mucosal ascorbic acid and total vitamin C concentrations were not related to mucosal histology, but correlated weakly with reactive oxygen species activity (chemiluminescence and malodialdehyde levels). CONCLUSIONS: Data suggest that reactive oxygen species play a pathological role in H pylori gastritis, but mucosal ascorbic acid is not depleted in this condition.
Adult↗
Patient factors that predict failure of omeprazole, clarithromycin, and tinidazole to eradicate Helicobacter pylori.
Omeprazole (20 mg od/b.d.), clarithromycin (250 mg b.d.) and tinidazole (500 mg b.d. for 7 days) [OCT] is an effective regimen against Helicobacter pylori. However, treatment fails in 5%-10% of patients and the reasons for this are not clear. We investigated patient factors that independently predicted failure of this regimen. H. pylori-positive patients were prescribed OCT and the success of treatment was evaluated by the 13C-urea breath test at least 4 weeks after completion of therapy. Patients were prospectively interviewed on past medical history of peptic ulcer and H2-receptor antagonist (H2RA) pre-treatment, smoking history, and alcohol intake. Data were also collected on age, gender, and endoscopic diagnosis to determine factors predicting failure of OCT. H. pylori eradication was achieved in 238 of 273 patients [87%-95% confidence intervals (CI), 83%-91%]. Age, alcohol intake, past medical history of peptic ulcer and peptic ulcer at endoscopy were not independently associated with treatment failure. H. pylori eradication with OCT was less successful in women (P = 0.02), in patients who had received H2RA pre-treatment (P = 0.02), and in smokers (P = 0.02) when evaluated by multiple logistic regression. These findings indicate that OCT is less effective in smokers and in patients who receive H2RA pre-treatment suggesting that these agents should be avoided, if possible, before the patient commences therapy. H. pylori eradication was less successful in women; this result needs further evaluation.
Adult↗
Do patients need to fast for a 13C-urea breath test?
OBJECTIVE: The 13C-urea breath test (13C-UBT) is a useful non-invasive method of diagnosing Helicobacter pylori infection. One of its limitations, however, is that patients have to fast for 4 h before testing. We have compared the accuracy of a non-fasting 13C-UBT (NF13C-UBT) with a fasting 13C-UBT (F13C-UBT) test and against a gold standard. DESIGN: An unblinded prospective crossover study. METHODS: H. pylori status was assessed by histology, culture and rapid urease test. Patients were defined as H. pylori positive if two or more tests gave a positive result and negative if all tests were negative. H. pylori status was indeterminate if only one test gave a positive result. Following endoscopy patients had a F13C-UBT and then a further NF13C-UBT up to 14 days later after eating two slices of toast with jam or honey and tea or coffee. RESULTS: Of the 222 patients recruited to the study, 123 were gold standard H. pylori positive and 94 were negative with five patients having indeterminate status. Compared to this gold standard the NF13C-UBT had a 98% sensitivity and 96% specificity and the F13C-UBT had a 96% sensitivity and 97% specificity. The NF13C-UBT and F13C-UBT agreed in 217/222 (98%) cases. CONCLUSION: Relaxation of the fasting state does not reduce the accuracy of the 13C-UBT, making this test more convenient for patients.
Biopsy↗
Ascorbic acid may protect against human gastric cancer by scavenging mucosal oxygen radicals.
High dietary ascorbic acid intake appears to protect against gastric cancer. This may be due to its action as a scavenger of reactive radical species formed in the gastric mucosa, resulting in a reduced level of radical-mediated DNA damage. We have studied 82 patients, of whom 37 had Helicobacter pylori-associated gastritis, a condition which predisposes to gastric cancer. Using electron paramagnetic resonance (EPR) spectroscopy we have demonstrated, for the first time, that ascorbyl radicals are generated in human gastric mucosa, presumably as a result of scavenging of free radicals by ascorbic acid. Quantification of ascorbyl radicals demonstrates that there is a higher concentration in those patients with H.pylori gastritis compared with subjects with normal histology (P < 0.01). We also found gastric mucosal luminol-enhanced chemiluminescence and malondialdehyde concentrations (which are believed to be markers of radical generation and tissue damage) to be higher in patients with H.pylori gastritis compared with those with normal histology (P < 0.001 and P < 0.01 respectively). The observed concentrations of the ascorbyl radical correlate with the level of luminol-enhanced chemiluminescence (r = 0.41, P < 0.001), but not with malondialdehyde concentrations (r = 0.08, P = 0.47). Mucosal ascorbic acid and total vitamin C concentrations did not vary between histological groups, nor did they correlate with mucosal levels of the ascorbyl radical, chemiluminescence or malondialdehyde. These data suggest that ascorbic acid is acting as a scavenger of free radicals generated in human gastric mucosa. The experiments therefore provide direct supportive evidence for the hypothesis that ascorbic acid protects against gastric cancer by scavenging reactive radical species which would otherwise react with DNA, with resultant genetic damage.
Adult↗
Comparison of one or two weeks of lansoprazole, amoxicillin, and clarithromycin in the treatment of Helicobacter pylori.
BACKGROUND: The simplest, most effective, and least expensive Helicobacter pylori therapy remains to be determined. Two weeks of 30 mg lansoprazole bid, 1 gm amoxicillin bid, and 500 mg clarithromycin bid (LAC2) had been shown to be an effective therapy for H. pylori. The aim of this study was to assess whether 1 week of this regimen (LAC1) would have a similar efficacy. MATERIALS AND METHODS: H. pylori-positive patients assessed histologically, by rapid urease test, microbiologically, and by a 13C-urea breath test (13C-UBT) were randomized to receive either LAC1 or LAC2 in a single-center open study. Patients were interviewed 1 to 3 days after completion of therapy to evaluate adverse events and compliance. Efficacy was determined by 13C-UBT at least 4 weeks after antibiotic therapy. RESULTS: Seventy evaluable patients were randomized to receive LAC1 (n = 33) LAC2 (n = 37). Of the 33 LAC1 patients, 30 (91%) were treated successfully (95% confidence interval (CI) = 76-98%), compared with 32 of 37 (86%) in the LAC2 group (95% CI = 71-96%). There was no difference in efficacy between the two groups (Fisher's exact test p = 1.0; 95% CI = -10.3%-19.2%). Patients taking LAC1 experienced significantly fewer severe adverse events than those taking LAC2 (Mann-Whitney U test). One of 64 patients had primary resistance to clarithromycin, and treatment was unsuccessful in this case. Six of the 7 remaining treatment failures developed secondary resistance to clarithromycin. CONCLUSIONS: LAC1 is as effective as LAC2 and is associated with less toxicity. Posttreatment clarithromycin resistance is common in patients who do not experience success with therapy.
2-Pyridinylmethylsulfinylbenzimidazoles↗
Helicobacter pylori infection and dental care.
Sixty two patients (mean age 45.6 years) were assessed for oral hygiene and periodontal disease by dental examination before endoscopy. Information about oral care, smoking, and dentures was obtained and samples of dental plaque collected. The presence of Helicobacter pylori in plaque as sought by culture and polymerase chain reaction (PCR), and gastric antral biopsy specimens were taken for histological examination. Although H pylori was detected in the antral specimens of 34 patients (54%) all of the cultures of dental plaque were negative, and PCR was only positive from the dentures of one patient. Smokers had poor oral hygiene, visited their dentist less often, and brushed their teeth less frequently. There was no correlation of H pylori gastritis with either dental hygiene or periodontal disease. These results suggest that dental plaque or dentures are not an important reservoir for H pylori and are probably not a significant factor in transmission of the organism. The conflicting results in published works may be caused by differences in sample collection, culture techniques, or oral contamination from gastric juice as a result of gastro-oesophageal reflux at the time of endoscopy.
Adult↗
Hospital patients--are they active enough?
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Exercise↗
Carriers of hepatitis B surface antigen: possible association between low levels of clotting factors and protection against ischaemic heart disease.
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Blood Coagulation Factors↗
The influence of long-term cimetidine as an adjuvant to pancreatic enzyme therapy in cystic fibrosis.
Seventeen patients on constant doses of pancreatic enzymes were randomised to receive either cimetidine or placebo for either of two successive six month periods. Nutritional state and maldigestion were assessed at the beginning and end of each period. Reductions in mean values of faecal fat, nitrogen, wet weight, and bile salts of approximately 30% were found on cimetidine therapy. Results showed considerable variation and only the fall in faecal fat was statistically significant. No benefit was demonstrated for height, weight, skinfold thickness, albumin, vitamin A, bone age or Crispin-Norman score.
Adolescent↗
Development of impaired splenic function in intestinal lymphangiectasia.
We describe a patient with intestinal lymphangiectasia who developed hyposplenism and speculate that it resulted from chronic loss of lymphocytes into the gut.
Adult↗