Modelling the roles of MAO and SSAO in glucose transport

Amine oxidase substrates such as benzylamine and methylamine have been shown to stimulate glucose uptake by increasing the recruitment of the glucose transporter GLUT4 from vesicles within the cell to the cell surface. Inhibition of this effect by the presence of semicarbazide and catalase led to the suggestion that the process is mediated by the H(2)O(2) produced in the oxidation of these amines. Tyramine, which is a substrate for both MAO and SSAO, can also stimulate this process and in that case both MAO and SSAO inhibitors attenuate the effect. Benzylamine does not occur physiologically and tyramine is normally present in only very low amounts. We have suggested that adrenaline, which also stimulates glucose metabolism through adrenoceptors, may act as the physiological substrate for GLUT4 recruitment. It is a substrate for MAO but not SSAO. However, oxidation of adrenaline by MAO releases both H(2)O(2) and methylamine for further oxidation by SSAO. In order to gain a fuller understanding of this process we have performed simulation studies that may be used to assess the contributions of the amine oxidases to the process under a variety of conditions. The results are consistent with the experimentally observed behaviour. This approach not only helps to establish the feasibility of this process but also allows behaviour prediction and the identification of further experimental approaches.

37. MONITORING HIV TRANSMISSION AMONG MEN SEEN AT METROPOLITAN SEXUAL HEALTH CLINICS IN AUSTRALIA, 1996-2005

National surveillance for newly diagnosed HIV infection indicates an increasing trend in Queensland, South Australia and Victoria but not in New South Wales. It was not clear if trends in newly diagnosed HIV infection were due to different patterns of HIV antibody testing. We report the pattern of HIV antibody testing among people seen through a network of sexual health clinics in Australia. Six public metropolitan sexual health clinics (Sydney Sexual Health Centre (SSHC), South West Sexual Health Centre (SSWSHC), NSW; Brisbane Sexual Health Clinic (BSHC), Gold Coast Sexual Health Clinic (GCSHC), QLD; Clinic 275, SA; Melbourne Sexual Health Centre (MSHC), VIC) provide annual tabulations of the number of people seen, the number tested for HIV antibody, and the number with newly diagnosed HIV infection, broken down by sex, exposure category and testing history. The number of men seen at the clinics ranged from 17 138 in 1996 to 19 184 in 2005. Among men seen, the percentage who were tested for HIV declined from 62% in 1996 to 50% in 2001 and increased to 56% in 2005. HIV prevalence remained stable in 1996-2005 at 0.5% and was highest at SSHC (0.7-1.1%) and among homosexually active men (1.8% in 1996 and 1.6% in 2005). The percentage of men retested within 12 months of a negative test increased from 41% in 1996 to 44% in 2005. At SSHC, retesting among homosexually active men declined from 56% in 1996 to 44% in 2001 and increased to 58% by 2005. At Clinic 275 and MSHC, 50-60% and around 50% of homosexually active men were retested in 1996 - 2005 and in 2004-2005, respectively. HIV infection was newly diagnosed in 0.4% (8) in 1996 and in 0.8% (26) in 2005. While HIV antibody testing patterns vary between the clinics, incidence of newly diagnosed HIV infection has remained low.

Health-related quality of life in chronic coagulation disorders

Measurement of health-related quality of life (HR-QoL) is used in patients with haemophilia as a way of assessing the effectiveness of health care, especially as cure is not possible. We report the first such study on patients with chronic coagulation disorders in Australia, using The RAND 36-item Health Survey 1.0 (SF-36), a standardized validated questionnaire combined with a semistructured interview. The mean scores for the eight domains of the SF-36 ranged from 52.5 +/- 42.1 for physical role to 80.0 +/- 20.0 for social functioning. Comparison with normative data obtained from the Australian Bureau of Statistics (ABS) demonstrated a reduction in all domains in this population with statistically significant reductions in general health, physical role limitation and vitality. Comparison with other studies indicates that the HR-QoL of patients with haemophilia and von Willebrand's disorder in Australia is comparable with other Western countries, reflecting the overall similar quality of care available to these patients. This study also provides a good cross-sectional view of the psychosocial factors of life in patients in Australia and recognizes the positive family support available to this population, while raising relevant shortcomings in schools and at the workplace that need to be studied further in a controlled manner.

Operational competency development in E and F grade nursing staff: preparation for management

There is limited literature for operational management competency development in E and F grade nursing staff. These grades of nursing staff have to take over from G grade nurses ward managers on a regular basis. With human resources doing less of the operational management and taking more of an advisory role, nursing staff are now required to deal with disciplinary procedures and other management issues in a more consistent manner. Therefore, this development programme in a Scottish primary care NHS psychiatric service was designed to enable E and F grade nurses to take over from ward managers and to enable ward managers to 'succession plan' for times when they will be absent. The literature is reviewed, the background to the development programme described and the design of the development programme is explained. The results from both the pilot study (n=13) and first group (n=8) through the course are presented, evaluated discussed.

Long term analysis of recurrences in patients treated by multimodality approach for local treatment of early rectal cancer—Liverpool’s Experience

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Background: Local treatment of early rectal cancer with curative intent is highly controversial. Three years ago, we reported our results in 100 patients treated by multimodality approach. We have updated our results and analyse the pattern of recurrences in155 patients treated up to 2005 Methods: From Jan 1992 to Jan 2005, local treatment was offered to 155 patients with low rectal carcinoma. The majority of patients were elderly with the mean age of 76 years( range 33–101). There were 87 males and 68 females. 109 had surgery; TEM (79 patients) and TAR(30 patients). Forty six patients had radical radiotherapy alone.Locally treated patients were followed up regularly with DRE and sigmoidoscopy. CT and MRI scans were done at 0,12 and 24 months. Results: Local recurrence only occured in 13 patients (8.3%). Four patients had local and distant recurrence (2.5%). Overall local recurrence occured in 17 patients (10.8 %). Salvage surgery was carried out in 11 patients(10 APER and 1 local excision). Two had retreatment with Papillon. A total of 13 patients had salvage treatments (76.5%). At median follow-up of 40 months (range 12–168) only 72.7% of patients were still alive. Five patients (3.2%) developed distant metastases only and one had nodal recurrence. Cancer specific survival was 96% and colostomy free survival was 93%. Conclusions: Local treatment of early rectal cancer is a complex issue that needs to be address and discuss. As ageing populationis likely to increased in the next decade demands on local treatment will increase. It is important to balance the benefits of radical surgery in terms of lower local recurrence against increase mortality and morbidity from such procedures especially in elderly patients, versus slightly higher local recurrences and much lower mortality and morbidity from conservative treatments such as TEM and Papillon contact radical radiotherapy. Our study has shown that local treatment is safe and effective treatment for elderly patients with medical co morbidity. In our experience, salvage surgery can be offered for recurrences in the majority of patients but long term close follow-up is necessary. A careful case selection and multimodality treatment is essential for successful out come.

No significant financial relationships to disclose.

Accuracy of thin section magnetic resonance using phased-array pelvic coil in predicting the T-staging of rectal cancer

Magnetic resonance (MR) imaging may contribute to staging rectal cancer and inform the decision regarding administration of pre-operative radiotherapy. The accuracy of MR has been debated. The aim of the present study was to determine the accuracy of thin section T2-weighted MR images in rectal cancer patients. MR results were compared with histological assessment of resection specimens. Over a 2-year period, 42 patients were studied. Histological staging was pT2 n = 13, pT3 n = 25 and pT4 n = 4. MR diagnostic accuracy was 74%. MR sensitivity and specificity was 62% and 79% for pT2 lesions, 84% and 59% for pT3 lesions and 50% and 76% for pT4 lesions. Estimation of tumour penetration by thin section MR imaging of rectal cancers using pelvic phased-array coil has moderate diagnostic accuracy. The limitations of MR should be acknowledged when selecting rectal cancer patients for pre-operative radiotherapy.

Estimation of diffuse and point source microbial pollution in the ribble catchment discharging to bathing waters in the north west of England

Achieving compliance with the mandatory standards of the 1976 Bathing Water Directive (76/160/EEC) is required at all U.K. identified bathing waters. In recent years, the Fylde coast has been an area of significant investments in 'point source' control, which have not proven, in isolation, to satisfactorily achieve compliance with the mandatory, let alone the guide, levels of water quality in the Directive. The potential impact of riverine sources of pollution was first confirmed after a study in 1997. The completion of sewerage system enhancements offered the potential for the study of faecal indicator delivery from upstream sources comprising both point sources and diffuse agricultural sources. A research project to define these elements commenced in 2001. Initially, a desk study reported here, estimated the principal infrastructure contributions within the Ribble catchment. A second phase of this investigation has involved acquisition of empirical water quality and hydrological data from the catchment during the 2002 bathing season. These data have been used further to calibrate the 'budgets' and 'delivery' modelling and these data are still being analysed. This paper reports the initial desk study approach to faecal indicator budget estimation using available data from the sewerage infrastructure and catchment sources of faecal indicators.

The 374 clinic: an outreach sexual health clinic for young men

OBJECTIVES

To describe the establishment of a community based walk-in outreach genitourinary medicine clinic, the "374 clinic," in south London to target young men under 25 in an area with high rates of sexually transmitted infections (STIs).

METHODS

The outreach clinic was set up within a Brook advisory centre, which already had gained the trust of local young people. Epidemiological, clinical, and laboratory data were obtained retrospectively for the first 24 weeks of the service.

RESULTS

134 attendances were recorded, including 94 new and 10 rebook events. The age range of the young men seen was 12-27 years (mean 18.2 years), the patients were mainly from black and ethnic minority groups, and all but one were heterosexual. Most men had heard about the clinic by "word of mouth," recommendation by Brook staff or through clinic promotional material. Condoms were used more frequently with non-regular sexual partners than with regular partners. The uptake of screening for gonococcal and chlamydial infections, mostly by urine based molecular techniques, was 98%. The uptake for HIV testing in men aged 16 or more was 72%. An overall STI prevalence rate of 26% was detected in the clinic population, which consisted almost equally of asymptomatic and symptomatic patients. The most prevalent STI was chlamydial infection (12%).

CONCLUSIONS

The young men who attended the outreach clinic were happy to undergo both non-invasive urine based testing for gonorrhoea and chlamydia as well as phlebotomy to test for HIV and syphilis. The 374 clinic approach may prove to be a useful model for further outreach services to combat poor sexual health of young men in inner city areas.

Increasing dose intensity of anthracycline antibiotics improves outcome in patients with acute myelogenous leukemia

To understand the effect of dose concentration in the overall survival of AML, we conducted a study on the efficacy and toxicity of a drug combination where the dose of daunorubicin was intensified. For this analysis, the outcome of patients entered into two consecutive prospective trials was compared. Inclusion criteria in both arms were identical and consisted of primary AML in adults. Treatment protocol for Cape Town Regimen 4 (CTR-IV) comprised of cytarabine infusion (100 mg/m(2)) and etoposide (100 mg/m(2)), injection daily for 7 days in combination with daunorubicin (45 mg/m(2)) on days 1, 2, and 3. Patients achieving remission were given two further courses of the same chemotherapy and received allogeneic or autologous transplantation. CTR-V was a similar treatment program, except that daunorubicin was escalated on days 1, 2, and 3 to 75 mg/m(2) during induction and to 60 mg/m(2) during a single consolidation. Patients were also offered stem cell transplantation. Between 1990 and 1997, 78 patients (median age 33; range 13-67 years) fulfilled entry criteria and received CTR-IV. From 1998 onwards, 35 patients (median age 36; range 15-66 years) were prospectively enlisted into the CTR-V trial. The patient population in CTR-V had fewer Caucasian individuals (P = 0.02) and had significantly lower presentation hemoglobin (P = 0.0002). Following initiation of induction chemotherapy, 40 patients failed to respond. Among these, 10 patients demised before day 28. Another 30 (25/69 CTR-IV and 5/32 in CTR-V groups; P = 0.01) had leukemia that was resistant to chemotherapy, and all died. Remission was achieved in 59% of patients treated with CTR-IV and 77% of those receiving CTR-V (P = 0.03). CR occurred with a single course in 64% versus 88% (P = 0.02), respectively. There were no differences in the toxicity profile between these two combinations. Disease recurred in 50% and 28% (P = 0.07) of patients. For the 113 individuals, median follow up is 254 (range 19-4,451) and 304 (12-1,702; P = 0.03) days. Survival is 23% and 40%, respectively, favoring patients treated with CTR-V (log rank; P = 0.03). Cox regression analysis showed that treatment group (P < 0.001), FAB type, hemoglobin level, and platelet count were independent factors for response to chemotherapy. Older age and not undergoing myeloablative therapy were the only adverse factors for survival. We conclude that increase in the treatment dose of daunorubicin in patients with AML led to a higher remission rate, particularly with a single course of chemotherapy and had an equivalent toxicity profile. This therapeutic modification is also likely to result in substantial reduction in patient stay in hospital and in the overall expenditure.

Extrarenal retroperitoneal angiomyolipoma: management of a rare benign tumour

BACKGROUND

Extrarenal retroperitoneal angiomyolipomas are benign tumours of mesenchymal tissue origin. The diagnosis of these tumours is usually based on the perioperative findings and confirmed by the resultant specimen's histology. The main differential diagnosis is liposarcoma, and accurate preoperative imaging combined with fine-needle aspiration cytology may permit a non-operative approach to these tumours.

CASE PRESENTATION

We describe a single case of extrarenal retroperitoneal pelvic angiomyolipoma and provide the first case of magnetic resonance imaging of these extremely rare tumours.

CONCLUSION

This article discusses the presentation, management, and outcome associated with these tumours.

Modified de Gramont with oxaliplatin in the first-line treatment of advanced colorectal cancer

We previously reported high activity for oxaliplatin and a modified de Gramont regimen (OxMdG) in a single centre study of patients with metastatic colorectal cancer. We now report results with a further 56 patients treated at 14 centres. Low rates of grade 3 and 4 toxicity were seen, with no toxic deaths. Objective response rates were CR/PR=53%; NC=34.7%; PD=12.2%. Median time to progression was 8.3 months and overall survival was 14.5 months. This regimen is more convenient than those based around the conventional de Gramont regimen but is highly active and well tolerated; it forms part of a current UK MRC phase 3 trial.

Potential role for advanced trauma life support programme in improving trauma care in Jamaica

Data from the Road Safety Unit in the Ministry of Transport and Works, Jamaica, show an increase in road traffic accidents from 7861 in 1991 to 11,010 in 1999. The average number of deaths annually was 380 +/- 48 (SD) while injuries averaged 3320 +/- 262 per year. This represents an injury to death ratio of 8.7 compared with 24.9 for Trinidad and Tobago and 40 for Canada. During the period 1991 to 2000, an average of 796 +/- 159 (SD) murders were committed annually. The number of murders increased by over 280 per cent between the decade of the seventies and the nineties. Data from the trauma registry of the University Hospital of the West Indies showed that 29.6 per cent of all admissions to the surgical ward between January 1998 and December 31, 2000, were due to injuries. There were 97 deaths (3%) during this period and 33 occurred in the Accident and Emergency Department with 70 per cent occurring within 120 minutes of their arrival. The Advanced Trauma Life Support (ATLS) Programme emphasizes the resuscitation and stabilization of injured patients in the first few hours after injury. Most Emergency Departments in Jamaica are staffed by relatively junior medical officers and the low injury to death ratio among victims of motor vehicle accidents may be due to suboptimal care. Introduction of an ATLS programme in Jamaica may reduce the number of preventable deaths and also stimulate interest in trauma care thus increasing preventative measures to decrease the high incidence of trauma in Jamaica.

Improving medical undergraduate trauma education through the Trauma Evaluation and Management programme at Mona

This study examines the potential role of the Trauma Evaluation and Management (TEAM) programme in the undergraduate curriculum for medical students in Jamaica. Thirty-two final year medical students were randomly assigned to two groups of 16. One group (No TEAM) completed two 20-item multiple choice question (MCQ) examinations on trauma resuscitation topics. The second group (TEAM group) completed the first 20-item MCQ. The TEAM manual was then distributed to both groups. After the TEAM programme for both groups, the TEAM group had the second MCQ examination. Unpaired "t" tests were used for in-between group and paired "t" tests for between group comparisons with p < 0.05 being considered statistically significant. Both groups completed a post-course questionnaire rating five items on a scale of one to five. The No TEAM group showed no difference in mean scores between the 1st and 2nd tests (55.3% in the 1st test to 52.2% in the 2nd test, p = 0.32). The TEAM Group improved their MCQ scores from 53.1% pre-module to 69.4% post-module (p < 0.001). A score of four of five was assigned by 28 students for the statement that the objectives were met, that trauma knowledge was improved and that there was overall satisfaction; by 17 students that clinical trauma skills were improved and 29 students that TEAM should be mandatory in the undergraduate curriculum. The TEAM programme improved trauma knowledge skills among senior medical students in Jamaica. The questionnaire results suggested enthusiasm for the programme and that it be made mandatory in the senior undergraduate medical curriculum.

Spreading depression-induced preconditioning in the mouse cortex: differential changes in the protein expression of ionotropic nicotinic acetylcholine and glutamate receptors

Preconditioning of the cerebral cortex was induced in mice by repeated cortical spreading depression (CSD), and the major ionotropic glutamate (GluRs) and nicotinic acetylcholine receptor (nAChRs) subunits were compared by quantitative immunoblotting between sham- and preconditioned cortex, 24 h after treatment. A 30% reduction in alpha-amino-3-hydroxy-5-methyl-4-iso- xazolepropionate (AMPA) GluR1 and 2 subunit immunoreactivities was observed in the preconditioned cortex (p < 0.03), but there was no significant change in the NMDA receptor subunits, NR1, NR2A and NR2B. A 12-15-fold increase in alpha7 nAChR subunit expression following in vivo CSD (p < 0.001) was by far the most remarkable change associated with preconditioning. In contrast, the alpha4 nAChR subunit was not altered. These data point to the alpha7 nAChR as a potential new target for neuroprotection because preconditioning increases consistently the tolerance of the brain to acute insults such as ischaemia. These data complement recent studies implicating alpha7 nAChR overexpression in the amelioration of chronic neuropathologies, notably Alzheimer's disease (AD).

A physiologically based pharmacokinetic model for trichloroethylene in the male long-evans rat

A physiologically based pharmacokinetic (PBPK) model for trichloroethylene (TCE) in the male Long-Evans (LE) rat was needed to aid in evaluation of neurotoxicity data collected in this rodent stock. The purpose of this study was to develop such a model with the greatest possible specificity for the LE rat. The PBPK model consisted of 5 compartments: brain, fat, slowly perfused tissue, rapidly perfused viscera, and liver. Partition coefficients (blood, fat, muscle, brain, liver) were determined for LE rats. The volumes of the brain, liver, and fat compartments were estimated for each rat, with tissue-specific regression equations developed from measurements made in LE rats. Vapor uptake data from LE rats were used for estimation of Vmaxc. As blood flow values for LE rats were not available, values from Sprague-Dawley (SD) and Fischer-344 (F344) rats were used in separate simulations. The resulting values of Vmaxc were used to simulate tissue (blood, liver, brain, fat) TCE concentrations, which were measured during (5, 20, 60 min) and after (60 min of TCE followed by 60 min of air) flow-through inhalation exposures of LE rats to 200, 2000, or 4000 ppm TCE. Simulation of the experimental data was improved by use of F-344 blood-flow values and the corresponding Vmaxc (8.68 mg/h/kg) compared to use of SD flows and the associated Vmaxc (7.34 mg/h/kg). Sensitivity analysis was used to determine those input parameters with the greatest influence on TCE tissue concentrations. Alveolar ventilation consistently (across exposure concentration, exposure duration, and target tissue) had the greatest impact on TCE tissue concentration. The PBPK model described here is being used to explore the relationship between measures of internal dose of TCE and neurotoxic outcome.