Phospholipase activity in human mesenteric ischaemia and infarction

Currently, diagnostic tests for mesenteric ischaemia and infarction are inadequate due to poor sensitivity and specificity. In addition, many potential markers appear too late to be clinically useful. At present, definitive diagnosis can only be made at the time of surgery, which is not ideal as surgery is often to be avoided in critically ill and elderly patients. A clinically useful, minimally invasive test is likely to decrease the currently very high mortality rate and allow monitoring of \u27at risk\u27 patients during their hospital stay. A two-dimensional electrophoresis based proteomic approach was undertaken to assess plasma protein differences between patients with surgically confirmed bowel infarction and control Intensive Care patients. The major protein differences were found to be members or variants of acute phase proteins. Serum amyloid A showed the largest difference between the two patient groups, and this protein was investigated in greater depth. An analysis was performed to compare the diagnostic ability of several commonly used indicators of critical illness and bowel infarction with serum amyloid A and phospholipase A2. Although none of the variables were ideal for clinical use, plasma phospholipase A2 activity showed the best discriminatory power, as determined by Receiver Operating Characteristic curves. From a review of the literature, phospholipase AI (PLA2) appeared to be increased in the bowel as a result of ischaemia and infarction. In one patient, matched tissues were obtained, and PLA2 activity was found to be significantly higher in infarcted bowel tissue compared to ischaemic bowel tissue. PLA2 activity was significantly greater in bowel lumen than tissue, suggesting that the protein was being released, and may enter the circulation. PLA2 activity was increased in the plasma of bowel infarction patients compared with control patients, though the difference was not significant. The phospholipase activity exhibited a number of similarities to typical phospholipase A2 proteins, but also showed a number of inconsistent characteristics. For this reason, we wished to identify the protein responsible for the increased phospholipase activity in infarcted human bowel. The PLA2 activity in human bowel could not be abolished by immunoprecipitation of the PLA2 isoforms IIA (well described in bowel) and V (a closely related isoform). To investigate these proteins, a native urea protein gel devised for snake venom phospholipase A2 was modified for use with mammalian phospholipase AI. The modified gel was used to show that the protein with phospholipase activity from infarcted gut was different from normal gut PLA2 and type IIA PLA2. A number of extensions were devised for these native gels and were found to be useful both in this investigation and for venom investigations. Protein purification was undertaken to identify the protein responsible for the increased phospholipase activity in infarcted bowel. Protein was purified from infarcted human bowel using a number of techniques that exploited unusual characteristics of the protein. The purification techniques each retained the native activity of the protein and the purification could therefore be monitored with a phospholipid hydrolysis assay at each stage. The protein identified by mass spectrometry was an excellent match for cyclophilin B, an inflammatory protein that had previously been identified in rat bowel at the mRNA level (Hasel et al, 1991, Kainer & Doris, 2000). As the purification progress had been monitored throughout with a phospholipid hydrolysis assay, cyclophilin B was an unexpected identification, as it is not known to have phospholipase activity. Cyclophilin B was removed from the highly purified samples via immunoprecipitation and this process abolished all phospholipase activity. The addition of cyclosporin A, (the pharmaceutical ligand of cyclophilin B), did not effect the phospholipase activity. Cyclophilin B protein was found in normal and infarcted human bowel using Western blotting. Cyclophilin B protein also appeared to be present in the bowel lumen and plasma of several patients with bowel infarction, but not in control patients. Immunohistochemistry confirmed the ubiquitous nature of cyclophilin B that had been reported by other groups. This project has investigated the use of two dimensional gel electrophoresis based proteomics to identify proteins present in the plasma of patients with confirmed bowel infarction and control intensive care patients. The major protein classes observed were members of the acute phase proteins, which highlights the need for pre-fractionation of plasma to identify lower abundance, disease associated proteins. A series of potential plasma markers were compared using Receiver Operating Characteristic Curves. Although no ideal marker was clear from this analysis, phospholipase activity appeared to warrant further investigation. Phospholipase activity was investigated in human infarcted bowel. Protein purification identified cyclophilin B as a bowel protein that showed unusual phospholipid hydrolysing activity. Cyclophilin B is a ubiquitous protein in intestinal cell types in both normal and infarcted tissue. There appears to be release of cyclophilin B into bowel lumen and plasma under conditions of mesenteric ischaemia and infarction

The importance of adequate referrals for chronic kidney disease

DISCUSSION: Regional Australia remains a district of workforce shortage for nephrology. Thus, it is imperative that patients who have the greatest need for nephrologist services are effectively identified upon referral. The aim of this study was to assess referrals to a regional nephrology service against Australian guidelines by assessing the patient’s renal function and the information contained in the referral document at the time of first consultation. We conducted a retrospective study of all referrals to a regional Australian nephrology service between 2013 and 2015. The 582 referrals that met the inclusion criteria were compared with Australian nephrology referral guidelines. Less than half of the referral documents (n = 253; 43.5%) described a clinical situation that met referral guidelines, typically due to insufficient pathology investigation. However, after consideration of renal functional test results performed at the initial consultation, an additional 82 cases met referral guidelines (n = 335; 57.6%). More than 40% of nephrology referrals to a regional Australian service did not meet Australian nephrology referral guidelines. This has implications for a regional nephrology service that is experiencing workforce pressures, in addition to the health system more broadly, and for patients. Many referrals contained insufficient information to allow differentiation of patients who would benefit most from nephrology care from patients who could be appropriately managed within primary care

Prevalence of atrial fibrillation in a regional Victoria setting, findings from the crossroads studies (2001–2003 and 2016–2018)

Objective: To estimate the prevalence of atrial fibrillation (AF) in regional Victoria at two time points (2001-2003 and 2016-2018), and to assess the use of electrocardiogram rhythm strips in a rural, community-based study for AF investigation. Design: Repeated cross-sectional design involving survey of residents of randomly selected households and a clinic. Predictors of AF were assessed using Firth penalised logistic regression, as appropriate for rare events. Setting: Goulburn Valley, Victoria. Participants: Household residents aged >= 16years. Non-pregnant participants aged 18+ were eligible for the clinic. Main outcome measures: Atrial fibrillation by 12 lead electrocardiogram (earlier study) or electrocardiogram rhythm strip (AliveCor (R) device) (recent study). Results: The age standardised prevalence of AF was similar between the two studies (1.6% in the 2001-2003 study and 1.8% in the 2016-2018 study, 95% confidence interval of difference -0.010, 0.014, p = 0.375). The prevalence in participants aged >= 65years was 3.4% (1.0% new cases) in the recent study. Predictors of AF in the earlier study were male sex, older age and previous stroke, while in the recent study they were previous stroke and self-reported diabetes. AliveCor (R) traces were successfully classified by the in-built algorithm (91%) vs physician (100%). Conclusion: The prevalence of AF among community-based participants in regional Victoria was similar to predominantly metropolitan-based studies, and was unchanged over time despite increased rates of risk factors. Electrocardiogram rhythm strip investigation was successfully utilised, and particularly benefited from physician overview

Heterogeneity of Rural Consumer Perceptions of Health Service Access Across Four Regions of Victoria

Access to a range of services, including health care, ranks among the key determinants of health and wellbeing. It varies with both health system supply factors and consumer demand characteristics. For rural populations, access to health services can be restricted for a variety of reasons, contributing to poorer health outcomes compared with metropolitan populations. Access to health care differs between communities, despite commonly being seen as homogenous in terms of lack of service and poor access. This article seeks to examine consumer perceptions of access to health service in four shires in rural Victoria and explore differences between rural areas. These insights may assist health services to reorient their modes of service provision to be more accessible to rural health consumers. A confidential self-administered questionnaire was mailed to randomly selected households in the four shires. A total of 1,271 questionnaires were returned (35 percent response rate) with 75 percent of respondents reporting good access to health care overall. Many factors contributed significantly to the perception of health access; however, these factors were unique to each rural community. The implication of this heterogeneity is that rural health care services must be tailored to promote equitable, quality health care outcomes with attention to local community needs at the core of efforts. Only locally-targeted actions will achieve optimal health service planning and delivery

Heterogeneity of rural consumer perceptions of health service access across four regions of Victoria

Access to a range of services, including healthcare, ranks among the key determinants of health and wellbeing. It varies with both health system supply factors and consumer demand characteristics. For rural populations, access to health services can be..

Physical activity and self-reported metabolic syndrome risk factors in the Aboriginal population in Perth, Australia, measured using an adaptation of the global physical activity questionnaire (gpaq)

Background: Complex, ongoing social factors have led to a context where metabolic syndrome (MetS) is disproportionately high in Aboriginal Australians. MetS is characterised by insulin resistance, abdominal obesity, hypertension, hypertriglyceridemia, high blood-sugar and low HDL-C. This descriptive study aimed to document physical activity levels, including domains and intensity and sedentary behaviour, and MetS risk factors in the Perth Aboriginal (predominately Noongar) community. Methods: The Global Physical Activity Questionnaire (GPAQ), together with a questionnaire on self-reported MetS risk factors, was circulated to community members for completion during 2014 (n = 129). Results: Data were analysed using chi-squared tests. The average (SD) age was 37.8 years (14) and BMI of 31.4 (8.2) kg/m2 . Occupational, transport-related and leisure-time physical activity (PA) and sedentary intensities were reported across age categories. The median (interquartile range) daily sedentary time was 200 (78, 435), 240 (120, 420) and 180 (60, 300) minutes for the 18–25, 26–44 and 45+ year-olds, respectively (p = 0.973). Conclusions: An in-depth understanding of the types, frequencies and intensities of PA reported for the Perth Aboriginal community is important to implementing targeted strategies to reduce the prevalence of chronic disease in this context. Future efforts collaborating with community should aim to reduce the risk factors associated with MetS and improve quality of life

Community health programs delivered through information and communications technology in high-income countries : Scoping review

Background: The COVID-19 pandemic has required widespread and rapid adoption of information and communications technology (ICT) platforms by health professionals. Transitioning health programs from face-to-face to remote delivery using ICT platforms has introduced new challenges. Objective: The objective of this review is to scope for ICT-delivered health programs implemented within the community health setting in high-income countries and rapidly disseminate findings to health professionals. Methods: The Joanna Briggs Institute’s scoping review methodology guided the review of the literature. Results: The search retrieved 7110 unique citations. Each title and abstract was screened by at least two reviewers, resulting in 399 citations for full-text review. Of these 399 citations, 72 (18%) were included. An additional 27 citations were identified through reviewing the reference lists of the included studies, resulting in 99 citations. Citations examined 83 ICT-delivered programs from 19 high-income countries. Variations in program design, ICT platforms, research design, and outcomes were evident. Conclusions: Included programs and research were heterogeneous, addressing prevalent chronic diseases. Evidence was retrieved for the effectiveness of nurse and allied health ICT-delivered programs. Findings indicated that outcomes for participants receiving ICT-delivered programs, when compared with participants receiving in-person programs, were either equivalent or better. Gaps included a paucity of co-designed programs, qualitative research around group programs, programs for patients and carers, and evaluation of cost-effectiveness. During COVID-19 and beyond, health professionals in the community health setting are encouraged to build on existing knowledge and address evidence gaps by developing and evaluating innovative ICT-delivered programs in collaboration with consumers and carers

Glycaemic Control among Rural Health Consumers: A Retrospective Study of a Diabetes Center

Abstract Aim: The aim of this paper is to highlight the successes of and challenges faced by a publically funded diabetes center in a regional area. Methods: Demographic and laboratory cross sectional data were collected from electronic patient records. Data from a patient's very first test undertaken when attending the hospital and the latest test undertaken at the Diabetes center were noted and included age, sex, residential postcode and glycated haemoglobin (HbA1c) levels. Results: A third of patients reached the therapeutic guideline of 'very good control' for HbA1c levels. Females had lower Hb1Ac levels, while males and those that lived further away from the diabetes center had higher levels of HbA1c. However, a significant improvement in glycaemic control among men and those who lived 'out of town' was noted, while the corresponding pattern for women was not evident. Conclusion: The study demonstrated that there was an overall improvement in diabetes control among health consumers who attend the regional diabetes center, however, female patients residing in town showed a negligible change over time. At risk' patient groups may need further targeting for intensive intervention to achieve optimal diabetes control, even within the diabetes center

Talking about overweight and obesity in rural Australian general practice

As many patients’ sole point of contact with the health care system, primary health care physicians (general practitioners [GPs] in Australia) are often positioned as key players in responding to rates of overweight and obesity in dominant public discourse. However, research from Western industrialised countries suggests that GPs may not be prepared for, or confident in, having conversations about overweight and obesity with patients. Little attention has been given to this topic in Australia, particularly in the context of rural health. The aim of this study was to understand how GPs in two rural settings in Victoria, Australia talk about overweight and obesity with patients. Working from a multidisciplinary perspective, a qualitative study design was adopted, and semi‐structured interviews were conducted with seven GPs and seven GP patients living in two rural communities between January and April, 2016. Data was coded manually and thematic analysis was used to explore the data. The findings of this study support the argument that, in contrast to dominant messages within public health discourses, GPs may not be best placed to act as the primary actors in responding to overweight and obesity as they are constructed in epidemiological terms. In fact, the perspectives of GP study participants suggest that to do so would compromise important dimensions of general medical practice that make it simultaneously a human practice. Instead, more balanced, holistic approaches to discussing and responding to overweight and obesity with patients could be taken up in local, interdisciplinary collaborations between different health professionals and patients, which utilise broader social supports. Focussing on long‐term, incremental programs that consider the whole person within their particular socio‐cultural environment would be a productive means of working with the complexities of overweight and obesity. However, structural level changes are required to ensure such initiatives are sustainable in rural practice

Barriers to effective conversations regarding overweight and obesity in regional Victoria

Free to read on publisher's website Background and objectives: General practitioners (GPs) have a crucial role to play in engaging patients in discussions about overweight and obesity. However, such discussions are currently uncommon. The aim of this study was to examine how GPs in rural areas talk about overweight and obesity with their patients, specifically to identify key barriers to effective conversations. Method: This study used a qualitative methodology. Semi-structured interviews were conducted with GPs (n = 7) and patients (n = 7) across two rural areas. Results: Key barriers to effective conversations between GPs and patients about overweight and/or obesity include: uncertainty about appropriate language; lack of time; concerns about compromising mutual trust and rapport; concerns about patient readiness; concerns about patients' mental health and how this may be impacted by discussing a potentially upsetting and stigmatising topic; and lack of effective and individualised treatment and/or referral options. Discussion: The findings suggest that responses to overweight and obesity need to be localised and tailored. Structural-level change is required to enable better responses to overweight and obesity, including multidisciplinary team approaches