Electron streaming dose measurements and calculations on a 1.5 T MR-Linac.

PURPOSE: To evaluate the accuracy of different dosimeters and the treatment planning system (TPS) for assessing the skin dose due to the electron streaming effect (ESE) on a 1.5 T magnetic resonance (MR)-linac. METHOD: Skin dose due to the ESE on an MR-linac (Unity, Elekta) was investigated using a solid water phantom rotated 45° in the x-y plane (IEC61217) and centered at the isocenter. The phantom was irradiated with 1 × 1, 3 × 3, 5 × 5, 10 × 10, and 22 × 22 cm2 fields, gantry at 90°. Out-of-field doses (OFDs) deposited by electron streams generated at the entry and exit surface of the angled phantom were measured on the surface of solid water slabs placed ±20.0 cm from the isocenter along the x-direction. A high-resolution MOSkin™ detector served as a benchmark due to its shallower depth of measurement that matches the International Commission on Radiological Protection (ICRP) recommended depth for skin dose assessment (0.07 mm). MOSkin™ doses were compared to EBT3 film, OSLDs, a diamond detector, and the TPS where the experimental setup was modeled using two separate calculation parameters settings: a 0.1 cm dose grid with 0.2% statistical uncertainty (0.1 cm, 0.2%) and a 0.2 cm dose grid with 3.0% statistical uncertainty (0.2 cm, 3.0%). RESULTS: OSLD, film, the 0.1 cm, 0.2%, and 0.2 cm, 3.0% TPS ESE doses, underestimated skin doses measured by the MOSkin™ by as much as -75.3%, -7.0%, -24.7%, and -41.9%, respectively. Film results were most similar to MOSkin™ skin dose measurements. CONCLUSIONS: These results show that electron streams can deposit significant doses outside the primary field and that dosimeter choice and TPS calculation settings greatly influence the reported readings. Due to the steep dose gradient of the ESE, EBT3 film remains the choice for accurate skin dose assessment in this challenging environment.

Characterizing magnetically focused contamination electrons by off-axis irradiation on an inline MRI-Linac.

PURPOSE: The aim of this study is to investigate off-axis irradiation on the Australian MRI-Linac using experiments and Monte Carlo simulations. Simulations are used to verify experimental measurements and to determine the minimum offset distance required to separate electron contamination from the photon field. METHODS: Dosimetric measurements were performed using a microDiamond detector, Gafchromic® EBT3 film, and MOSkinTM . Three field sizes were investigated including 1.9 × 1.9, 5.8 × 5.8, and 9.7 × 9.6 cm2 . Each field was offset a maximum distance, approximately 10 cm, from the central magnetic axis (isocenter). Percentage depth doses (PDDs) were collected at a source-to-surface distance (SSD) of 1.8 m for fields collimated centrally and off-axis. PDD measurements were also acquired at isocenter for each off-axis field to measure electron contamination. Monte Carlo simulations were used to verify experimental measurements, determine the minimum field offset distance, and demonstrate the use of a spoiler to absorb electron contamination. RESULTS: Off-axis irradiation separates the majority of electron contamination from an x-ray beam and was found to significantly reduce in-field surface dose. For the 1.9 × 1.9, 5.8 × 5.8, and 9.7 × 9.6 cm2 field, surface dose was reduced from 120.9% to 24.9%, 229.7% to 39.2%, and 355.3% to 47.3%, respectively. Monte Carlo simulations generally were within experimental error to MOSkinTM and microDiamond, and used to determine the minimum offset distance, 2.1 cm, from the field edge to isocenter. A water spoiler 2 cm thick was shown to reduce electron contamination dose to near zero. CONCLUSIONS: Experimental and simulation data were acquired for a range of field sizes to investigate off-axis irradiation on an inline MRI-Linac. The skin sparing effect was observed with off-axis irradiation, a feature that cannot be achieved to the same extent with other methods, such as bolusing, for beams at isocenter.

Adoption of routine virologic testing and predictors of virologic failure among HIV-infected children on antiretroviral treatment in western Kenya.

BACKGROUND: Access to routine virologic monitoring, critical to ensuring treatment success, remains limited in low- and middle-income countries. We report on implementation of routine viral load (VL) monitoring and risk factors for virologic failure among HIV-infected children on antiretroviral treatment (ART) in Western Kenya. METHODS: Routine VL testing was introduced in western Kenya in November 2013. We performed a case-control study among 1190 HIV-infected children ≤15 years on ART who underwent routine VL testing June 2014-May 2015. A random sample of 98 cases (virologic failure define as VL >1000 cps/mL) and 201 controls (VL <1000 cps/mL) from five facilities in three high HIV prevalence counties in Kenya were followed for a minimum of 12 months. Data from patient charts were analyzed using logistic regression to determine factors associated with failure to attain virologic suppression at initial routine and subsequent VL testing among cases. RESULTS: Overall, 1190 (94%) children with a median age of 8 years underwent routine VL testing of whom (37%) had virological failure. Among the 299 cases and controls, WHO stage, baseline CD4 count and time since ART initiation were not associated with virologic failure during the follow-up period. In multivariable analysis, unsuppressed children at initial test were more likely to be male (adjusted Odds Ratio (aOR) 2.1, 95% Confidence Interval (CI) 2.1-3.6) and have had an ART regimen change (aOR 2.0, CI 1.0-3.7) than controls. Of the two-thirds of children 201/299 who had a subsequent VL performed, VL suppression was greater among those suppressed at initial test 126/135 (93.3%) compared to children with virologic failure 15/66 (22.7%, p<0.0001). Among those failing at first test who achieved viral suppression in follow up, 12/15 (80%) were on a protease inhibitor (PI)-based regimen. In the multivariable analysis of children with subsequent VL testing, children on PI-based 2nd line regimens were 10-fold more likely to achieve viral suppression than children on first-line NNRTI-based ART (adjusted Odds Ratio [aOR] 0.1; 95%CI 0.0-0.4). CONCLUSION: Coverage of initial routine viral load testing among children on ART in western Kenya is high. However, subsequent testing and virologic suppression are low in children with virologic failure on initial routine viral load test. There is an urgent need to improve management and viral load monitoring of children living with HIV experiencing treatment failure to ensure improved long-term outcomes.

Developing research priorities in Australian primary health care: a focus on nutrition and physical activity.

Research priority setting is an important component of research planning, particularly when research options exceed available resources. This study identified the research priorities for supporting healthy lifestyle behaviours in the Australian primary healthcare setting. A five-step stakeholder engagement process was undertaken. Ten stakeholder organisations participated in the process, including patient representatives, health professional associations, health educators, researchers, government advisors and policymakers. Each organisation was asked to provide up to three research questions deemed as a priority. Research questions were critically appraised by the project team for answerability, sustainability, effectiveness, potential for translation and potential to affect disease burden. A blinded scoring system was used to rank the appraised questions, with higher scores indicating higher priority (range of scores possible 87-156). Thirteen unique research questions were submitted by stakeholders and achieved a range of scores from 87 to 139 points. The highest scoring research questions focused on: (i) the effectiveness of different health professionals at facilitating healthy lifestyle behaviours; (ii) the effect of health literacy on behaviour change; and (iii) cost-benefit analysis of healthy lifestyle promotion in primary health care. These priorities can be used to ensure future research projects directly align with the needs and preferences of research end-users.

Responding to Young People's Health Risks in Primary Care: A Cluster Randomised Trial of Training Clinicians in Screening and Motivational Interviewing.

OBJECTIVE: To evaluate the effectiveness of a complex intervention implementing best practice guidelines recommending clinicians screen and counsel young people across multiple psychosocial risk factors, on clinicians' detection of health risks and patients' risk taking behaviour, compared to a didactic seminar on young people's health. DESIGN: Pragmatic cluster randomised trial where volunteer general practices were stratified by postcode advantage or disadvantage score and billing type (private, free national health, community health centre), then randomised into either intervention or comparison arms using a computer generated random sequence. Three months post-intervention, patients were recruited from all practices post-consultation for a Computer Assisted Telephone Interview and followed up three and 12 months later. Researchers recruiting, consenting and interviewing patients and patients themselves were masked to allocation status; clinicians were not. SETTING: General practices in metropolitan and rural Victoria, Australia. PARTICIPANTS: General practices with at least one interested clinician (general practitioner or nurse) and their 14-24 year old patients. INTERVENTION: This complex intervention was designed using evidence based practice in learning and change in clinician behaviour and general practice systems, and included best practice approaches to motivating change in adolescent risk taking behaviours. The intervention involved training clinicians (nine hours) in health risk screening, use of a screening tool and motivational interviewing; training all practice staff (receptionists and clinicians) in engaging youth; provision of feedback to clinicians of patients' risk data; and two practice visits to support new screening and referral resources. Comparison clinicians received one didactic educational seminar (three hours) on engaging youth and health risk screening. OUTCOME MEASURES: Primary outcomes were patient report of (1) clinician detection of at least one of six health risk behaviours (tobacco, alcohol and illicit drug use, risks for sexually transmitted infection, STI, unplanned pregnancy, and road risks); and (2) change in one or more of the six health risk behaviours, at three months or at 12 months. Secondary outcomes were likelihood of future visits, trust in the clinician after exit interview, clinician detection of emotional distress and fear and abuse in relationships, and emotional distress at three and 12 months. Patient acceptability of the screening tool was also described for the intervention arm. Analyses were adjusted for practice location and billing type, patients' sex, age, and recruitment method, and past health risks, where appropriate. An intention to treat analysis approach was used, which included multilevel multiple imputation for missing outcome data. RESULTS: 42 practices were randomly allocated to intervention or comparison arms. Two intervention practices withdrew post allocation, prior to training, leaving 19 intervention (53 clinicians, 377 patients) and 21 comparison (79 clinicians, 524 patients) practices. 69% of patients in both intervention (260) and comparison (360) arms completed the 12 month follow-up. Intervention clinicians discussed more health risks per patient (59.7%) than comparison clinicians (52.7%) and thus were more likely to detect a higher proportion of young people with at least one of the six health risk behaviours (38.4% vs 26.7%, risk difference [RD] 11.6%, Confidence Interval [CI] 2.93% to 20.3%; adjusted odds ratio [OR] 1.7, CI 1.1 to 2.5). Patients reported less illicit drug use (RD -6.0, CI -11 to -1.2; OR 0.52, CI 0.28 to 0.96), and less risk for STI (RD -5.4, CI -11 to 0.2; OR 0.66, CI 0.46 to 0.96) at three months in the intervention relative to the comparison arm, and for unplanned pregnancy at 12 months (RD -4.4; CI -8.7 to -0.1; OR 0.40, CI 0.20 to 0.80). No differences were detected between arms on other health risks. There were no differences on secondary outcomes, apart from a greater detection of abuse (OR 13.8, CI 1.71 to 111). There were no reports of harmful events and intervention arm youth had high acceptance of the screening tool. CONCLUSIONS: A complex intervention, compared to a simple educational seminar for practices, improved detection of health risk behaviours in young people. Impact on health outcomes was inconclusive. Technology enabling more efficient, systematic health-risk screening may allow providers to target counselling toward higher risk individuals. Further trials require more power to confirm health benefits. TRIAL REGISTRATION: ISRCTN.com ISRCTN16059206.

Uptake of Medicare chronic disease management incentives - a study into service providers' perspectives.

BACKGROUND: Chronic disease is responsible for 80% of the burden of disease in Australia. The Australian Government Medicare Benefits Schedule (MBS) provides incentives through specific Medicare items to optimise chronic disease management (CDM), yet little is known about factors that influence their uptake. METHODS: Exploratory qualitative research was used, which incorporated focus groups and interviews with 26 staff from nine general practices in southeast Queensland, together with review of practice-specific data on CDM income. Content analysis of qualitative data was undertaken to identify barriers, enablers and service models associated with MBS CDM item uptake. Triangulation of methods and data sources facilitated confirmation of findings. RESULTS: Time pressures and unreliable MBS information were common barriers to uptake for general practitioners. Employing a nurse, team-based approaches, recall systems and using only selected MBS CDM item numbers were associated with best uptake. CONCLUSION: Improved systems within general practice and Medicare may increase the uptake of MBS CDM item numbers.

The prevention access and risk taking in young people (PARTY) project protocol: a cluster randomised controlled trial of health risk screening and motivational interviewing for young people presenting to general practice.

BACKGROUND: There are growing worldwide concerns about the ability of primary health care systems to manage the major burden of illness in young people. Over two thirds of premature adult deaths result from risks that manifest in adolescence, including injury, neuropsychiatric problems and consequences of risky behaviours. One policy response is to better reorientate primary health services towards prevention and early intervention. Currently, however, there is insufficient evidence to support this recommendation for young people. This paper describes the design and implementation of a trial testing an intervention to promote psychosocial risk screening of all young people attending general practice and to respond to identified risks using motivational interviewing. MAIN OUTCOMES: clinicians' detection of risk-taking and emotional distress, young people's intention to change and reduction of risk taking. SECONDARY OUTCOMES: pathways to care, trust in the clinician and likelihood of returning for future visits. The design of the economic and process evaluation are not detailed in this protocol. METHODS: PARTY is a cluster randomised trial recruiting 42 general practices in Victoria, Australia. Baseline measures include: youth friendly practice characteristics; practice staff's self-perceived competency in young people's care and clinicians' detection and response to risk taking behaviours and emotional distress in 14-24 year olds, attending the practice. Practices are then stratified by a social disadvantage index and billing methods and randomised. Intervention practices receive: nine hours of training and tools; feedback of their baseline data and two practice visits over six weeks. Comparison practices receive a three hour seminar in youth friendly practice only. Six weeks post-intervention, 30 consecutive young people are interviewed post-consultation from each practice and followed-up for self-reported risk taking behaviour and emotional distress three and 12 months post consultation. DISCUSSION: The PARTY trial is the first to examine the effectiveness and efficiency of a psychosocial risk screening and counselling intervention for young people attending primary care. It will provide important data on health risk profiles of young people attending general practice and on the effects of the intervention on engagement with primary care and health outcomes over 12 months. TRIAL REGISTRATION: ISRCTN16059206.

Recovery from total hip replacement surgery: "it's not just physical".

In this grounded theory study we explored the process of recovery following total hip replacement (THR) surgery from the perspective of the older adult. In-depth interviews were conducted with 10 patients aged more than 65 years who had been discharged from hospital for a period of 4 to 6 months following THR surgery. Findings showed that three distinct but interrelated processes constitute the physical, psychological, and social recovery process: reclaiming physical ability, reestablishing roles and relationships, and refocusing self. Intervening conditions affecting the recovery process include comorbid conditions, the personal outlook of the patient, patients' relationships, and social support. The recovery process can lead to changes in personal and social functioning that patients might not anticipate. Awareness of potential changes will inform patient education and enable clinicians to develop strategies that facilitate THR patients' return to health.

Promoting leadership and management in Australian general practice nursing: what will it take?

AIM: This paper outlines the current state of Australian practice nursing, describes the context of general practice and establishes the importance of promoting leadership and management in this setting. BACKGROUND: Australian general practice nurses have emerged as key stakeholders in primary health care. However, their role in leadership and management has been largely invisible. The reasons for this are multifactorial, including the delay to establish a strong professional organization, their negative power relationships with general medical practitioners, limited nursing leadership and poorly defined roles. To date, the impetus for practice nurse growth has been largely external to the nursing profession. Growth has been driven by the increasing burden of chronic disease and workforce shortages. This has further weakened the control of nurse leaders over the development of the specialty. CONCLUSIONS: The Australian practice nurse role is at a crossroads. While the practice nurse role is a viable force to improve health outcomes, the growing strength of the practice nurse challenges traditional professional roles and practice patterns. IMPLICATIONS FOR NURSING MANAGEMENT: There is an urgent need to develop practice nurse leaders and managers to not only embrace the challenges of Australian general practice from an operational perspective, but also undertake a clinical leadership role. As clinical leaders, these nurses will need to develop a culture that not only optimizes health outcomes but also advances the status of the nursing profession.

General surgical patients' perspectives of the adequacy and appropriateness of discharge planning to facilitate health decision-making at home.

AIM: To investigate general surgical patients' perspectives of the adequacy and appropriateness of their discharge planning. OBJECTIVES: To identify any aspects of discharge planning that could be strengthened to assist people in managing their posthospital care and maintaining continuity of care. BACKGROUND: Appropriate discharge planning is a priority in today's healthcare environment in which patients are discharged 'quicker and sicker', sometimes without home support. Adequate and appropriate discharge planning helps promote health literacy, which has benefits for both patients and their caregivers in helping them manage postsurgical recovery at home. DESIGN: A qualitative, interpretive study was designed in which patients were interviewed at least one week after they returned home from hospital. METHODS: Purposeful sampling was used to interview 13 general surgical patients from one of three hospitals (two public and one private) in New South Wales and Queensland, Australia. Data were collected in unstructured interviews and analysed using thematic analysis. Reflective analysis by individual research team members generated preliminary themes, which were then analysed collectively by all members of the research team to achieve consensus on patients' perspectives. RESULTS: Themes included a 'one-size-fits-all' approach to providing discharge information; inconsistent or variable advice from different health professionals; a lack of predischarge assessment of their home and/or work conditions and the need for follow-up assessment of patient and carer needs. CONCLUSIONS: The findings of this study illuminate the need for a more individualized approach to discharge planning, taking into account the patient's age, gender, surgical procedure and family and community support for immediate and longer-term nursing follow-up. RELEVANCE TO CLINICAL PRACTICE: Patients would be more adequately prepared for their recovery period at home, by encouraging client-centred, interdisciplinary communication between health practitioners; adopting a flexible, approach to discharge planning which is tailored to individual needs of postsurgical patients, particularly in relation to advice and information related to recovery; and encouraging and supporting adequate health literacy for self-management.

The role of practice nurses in coordinated care of people with chronic and complex conditions.

General practice in Australia must cope with growing numbers of individuals with chronic and complex needs. The Australian Government has recognised the need to reform the primary health care sector to address this issue, with recent initiatives, such as coordinated care. The overall goal of coordinated care at a national level is to facilitate integrated care for people with chronic and complex conditions, by enhancing collaborative partnerships among general practitioners, primary health care providers, community service providers and clients. Interestingly, practice nurses (PNs) have not been identified as key stakeholders in the coordinated care service delivery model in Australia. In contrast, an expanded role for PNs has been in place in the United Kingdom and New Zealand for some time. This paper is based on focus group discussions with Australian PNs who have had a range of experiences in coordinated care models. The study identifies an important role for PNs, suggesting trial of a variety of models of coordinated care that include PNs in chronic disease management process.

Mammography screening in African American women: evaluating the research.

BACKGROUND: Notwithstanding some controversy regarding the benefits of screening mammography, it is generally assumed that the effects are the same for women of all race/ethnic groups. Yet evidence for its efficacy from clinical trial studies comes primarily from the study of white women. It is likely that mammography is equally efficacious in white and African American women when applied under relatively optimal clinical trial conditions, but in actual practice African Americans may not be receiving equal benefit, as reflected in their later stage at diagnosis and greater mortality. METHODS: Initial searches of Medline using search terms related to screening mammography, race, and other selected topics were supplemented with national data that are routinely published for cancer surveillance. Factors that potentially compromise the benefits of mammography as it is delivered in the current health care system to African American women were examined. RESULTS: While there have been significant improvements in mammography screening utilization, observational data suggest that African American women may still not be receiving the full benefit. Potential explanatory factors include low use of repeat screening, inadequate followup for abnormal exams, higher prevalence of obesity and, possibly, breast density, and other biologic factors that contribute to younger age at diagnosis. CONCLUSIONS: Further study of biologic factors that may contribute to limited mammography efficacy and poorer breast cancer outcomes in African American women is needed. In addition, strategies to increase repeat mammography screening and to ensure that women obtain needed followup of abnormal mammograms may increase early detection and improve survival among African Americans. Notwithstanding earlier age at diagnosis for African American women, mammography screening before age 40 years is not recommended, but screening of women aged 40-49 years is particularly critical.