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Biomedical subjects

R Mann

Publications and source records attributed to R Mann.

At least 73 records · Page 4Linked to original sources
PubMed1993

Distribution and origin of aminergic neurones in dog small intestine.

In dog ileum, axons containing immunoreactivity for tyrosine hydroxylase (TH) and for DOPA decarboxylase (DDC) invest the neurones of the enteric ganglia and are present around arterioles, in the deep plexus of the circular muscle and in the laminar propria of the mucosal villi. Immunoreactivity for serotonin (5-HT) was present in mucosal enterochromaffin cells and in varicose axons investing cells of the submucous plexus, but not in axons in myenteric plexus, circular muscle or mucosa. No enteric neuronal cell bodies were immunoreactive for DDC or for 5-HT. Two weeks after extrinsic denervation of the ileum, all TH staining was absent. By contrast, the pattern of DDC staining was unchanged, except around blood vessels. We conclude that motility of dog ileum is likely to be regulated by sympathetic noradrenergic inputs and by intrinsic serotonergic and 'amine-handling' neurones. Dopaminergic innervation of dog ileum appears to be restricted to a sparse vasomotor supply.

Animals↗
PubMed1993

An unusual complication in attempted non-surgical treatment of pancreatic bile duct stones.

This report describes a guidewire fracture during an attempt at endoscopic treatment of pancreatic duct calculi in a patient with chronic pancreatitis, multiple pancreatic duct stenoses and pancreatic duct stones. This patient underwent endoscopic sphincterotomy in order to perform pancreatic duct drainage prior to ESWL. After sphincterotomy, a guidewire was introduced into the main pancreatic duct, but was jammed by the calculi. Neither could the guidewire be removed nor a contrast medium catheter be pushed over it, thus making ESWL impossible. A stronger pull resulted in a fracture of the wire, and a 25 mm long part which could not be removed with a Dormia basket remained in the main pancreatic duct. A Whipple's procedure became necessary as definitive treatment for the pancreatico-lithiasis in this patient.

Adult↗
PubMed1993

Lymphoma: monitoring tumor size and signal intensity with MR imaging.

To assess the potential value of magnetic resonance (MR) imaging in monitoring disease status, 34 patients with residual masses underwent MR imaging at sequential intervals. Patterns of signal intensity suggestive of active and inactive residual disease were compared to changes in tumor size. The signal intensity pattern was suggestive of persistent disease in 18 patients, even though tumor size was stable or decreased. Three of these patterns, seen within 6 months of initiation of therapy, were due to necrosis or inflammation. The MR imaging assessment of inactive disease was confirmed in 15 of the remaining 16 patients. In no case was an increase in tumor size seen in conjunction with a decrease in signal intensity. Because tumor size and signal intensity changes are not parallel in many cases, MR imaging may have a role in monitoring masses in patients with lymphoma. Signal intensity patterns, however, reflect gross histologic characteristics and cannot be considered specific, especially in the first 6 months after initiation of therapy.

Adolescent↗
PubMed1993

Gastric and colorectal cancer in patients attending mission hospitals in rural areas of South-east Asia.

25 missionaries working in Taiwan, Thailand, Indonesia and the Philippines completed questionnaires regarding their clinical practice during the year 1980. Data were collected on the numbers of both gastric and colorectal cancers diagnosed. More than 90,000 out-patients were reviewed, and over 25,000 in-patients treated. In total, 76 gastric and 118 colorectal carcinomas were seen. Surgery and radiology were available at 88% of hospitals, but histology at only 53%. In both Indonesia and the Philippines, the relative risk of developing colorectal compared with gastric cancer was 3.3 (95% confidence limits 1.8-6.2 and 1.4-8.5, respectively). In Thailand and Taiwan, these tumours occurred with similar frequencies. Thailand, Indonesia and the Philippines had similar numbers of gastric neoplasms, but Taiwan a significantly higher number than the other countries (z > or = 4.4, p < 0.0001). Thailand had lower numbers of colorectal tumours than the Philippines, (z = 2.2, p < 0.05), Taiwan (z = 3.4, p < 0.001) and Indonesia (p = 5.0, p < 0.0001). Local dietary factors probably play an important role in the development of these tumours.

Christianity↗
PubMed1993

The gastroenterology service: a survey of general practitioners' requirements.

A postal questionnaire was sent to 634 Leicestershire general practitioners about the service they wanted from their local gastrointestinal unit. Their views were specifically sought in relation to the care of chronic gastrointestinal disorders such as coeliac disease and inflammatory bowel disease. This initial survey was 'testing the water' before addressing GP needs in all areas of gastroenterology including, management issues in peptic ulcer disease and hiatus hernia. The design of the questionnaire was simple with only 12 'yes' or 'no' stems. The response rate to one mailing of the questionnaire was 41% with the rate for each question ranging from 83% (on whether a telephone hot-line would be useful) to 99% (on the value of treatment protocols). There was a poor response rate to some individual stems, with rates of less than 10%, because most GPs only answered 'yes' to the stem they were interested in without answering 'no' to other parts. Most GPs wanted a regular news bulletin on the management of both inflammatory bowel disease and coeliac disease as well as detailed protocols on their treatment. Sixty per cent of respondents wanted a telephone hot line to senior gastroenterologists, with direct dialing to provide immediate advice. Eighty per cent of GPs want shared care with hospital consultants of such patients. A similar proportion thought that this decision should be made jointly by patients and their doctors. There is a clear desire by GPs for a more specialist education in line with the current trend of extending their role. GPs in Leicestershire would value a more active role in the management of patients with chronic intestinal diseases and it is likely that such views are widespread in Great Britain.

Decision Making↗
PubMed1992

Comparison of a second-generation combination chemotherapeutic regimen (m-BACOD) with a standard regimen (CHOP) for advanced diffuse non-Hodgkin's lymphoma.

BACKGROUND: In 1984, the Eastern Cooperative Oncology Group began a randomized controlled clinical trial of patients with advanced (stage III or IV) diffuse mixed or diffuse large-cell lymphoma to determine whether complete-remission rates, survival, and toxicity differed when patients were treated with a chemotherapeutic regimen containing cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP), as compared with a regimen containing bleomycin, doxorubicin, cyclophosphamide, vincristine, dexamethasone, methotrexate, and leucovorin (m-BACOD). METHODS: From July 1984 through January 1988, 392 patients were enrolled, 325 of whom (83 percent) were eligible for the analysis and capable of being evaluated. The extent of disease was defined according to standard staging techniques, including bilateral bone-core biopsies in 88 percent of patients. Randomization was stratified according to age (< 60 or > or = 60 years), performance status (0, 1, or other), stage (III or IV), and histologic presentation (diffuse mixed or diffuse large-cell lymphoma). RESULTS: After a median follow-up of four years, there were no significant differences in rates of complete remission, time to treatment failure, disease-free survival, or overall survival in the patients treated with CHOP as compared with those treated with m-BACOD. However, there was more severe and life-threatening pulmonary, infectious, and hematologic toxicity associated with the m-BACOD regimen. In an attempt to measure the importance of dose intensity in the 325 patients who could be analyzed, we retrospectively calculated dose intensity (measured in milligrams per square meter of body-surface area per week) and normalized dose intensity (defined as a percentage of the prescribed dose) for all drugs. The median normalized dose intensity for both cyclophosphamide and doxorubicin was found to be greater in the patients treated with CHOP than in those treated with m-BACOD. CONCLUSIONS: For patients with stage III or IV diffuse mixed or diffuse large-cell lymphoma, CHOP is superior to m-BACOD, but the role of dose intensity is not yet clear.

Age Factors↗
PubMed1992

t(11;18)(q21;q21) is a recurrent chromosome abnormality in small lymphocytic lymphoma.

We have identified two cases of previously untreated, small lymphocytic lymphoma with extranodal involvement, which had a reciprocal translocation, t(11;18)(q21;q21), as the sole cytogenetic abnormality. These two cases are remarkably similar to two previously reported cases carrying this translocation with regard to clinical features, cytogenetic abnormality, histologic subtype, and immunophenotype. Molecular genetic analysis of these two cases revealed clonal gene rearrangement of the IGH locus but only germline configuration of the BCL2 oncogene at 18q21 when probes and conditions that usually identify BCL2 rearrangement in lymphomas were used. Lymphomas bearing an (11;18) rearrangement appear to make up a phenotypically identifiable subgroup. Identification of the genes at the translocation breakpoints will be important.

Aged↗
PubMed1992

Gastric and colorectal cancer in the rural Indian subcontinent: a survey of patients attending mission hospitals.

37 missionaries working in India, Nepal, Pakistan, Bangladesh and Bhutan completed questionnaires regarding their clinical practice during the year 1980. Information was collected on the frequency of both gastric and colorectal cancers. More than 500,000 out-patients were reviewed and over 100,000 inpatients treated. A total of 291 gastric tumours and 169 colorectal carcinomas were diagnosed. Surgery was performed in 82% of the hospitals but only 36% had a histology service. In India and Pakistan there was no significant difference between the incidence of gastric and colorectal neoplasms. The relative risk of developing gastric rather than colorectal cancer in Bangladesh was 8 (95% confidence limits 4.5-14.2) and in Nepal the relative risk was 4 (95% confidence limits 2.0-7.0). A significant variation in the occurrence of cancer was observed between countries. Nepal had the highest and Pakistan the lowest numbers of both gastric and colorectal tumours. It seems likely that local environmental factors, such as diet, play a significant role in the development of these tumours.

Bangladesh↗
PubMed1992

Enhancement of incisional wound healing and neovascularization in normal rats by thrombin and synthetic thrombin receptor-activating peptides.

To better define thrombin-receptor interactions, we synthesized human thrombin peptides and identified binding-domain peptides that bind thrombin receptors and activate mitogenic signals (Glenn, K.C., G.H. Frost, J.S. Bergmann, and D.H. Carney. 1988. Pept. Res. 1:65-73). Treatment of full dermal dorsal incisions with a single topical application of thrombin receptor-activating peptide (TRAP-508) or human alpha-thrombin in saline enhances 7-d incisional breaking strength in normal rats up to 82% or 55% over saline-treated controls, respectively. Control wounds require approximately 11.5 d to achieve breaking strength equivalent to TRAP-treated wounds at day 7. Thus, a single application of TRAP accelerates healing, shifting the time course forward by up to 4.5 d. Histological comparisons at day 7 show more type I collagen, less evidence of prolonged inflammation, and an increase in number and maturity of capillaries in TRAP- and thrombin-treated incisions. Angiograms also show 50-65% more functional vascularization going across thrombin- and TRAP-treated surgical incisions. Thus, alpha-thrombin and thrombin peptides, such as those released following injury, appear to initiate or enhance signals required for neovascularization and wound healing. The ability to accelerate normal wound healing events with synthetic peptides representing receptor binding domains of human thrombin may offer new options for management of wound healing in man.

Amino Acid Sequence↗