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BackgroundUltra-low-dose (ULD) computed tomography (CT) scans should be used when CT is performed only for attenuation correction (AC) of positron emission tomography (PET) data. A tin filter can be used in addition to the standard aluminium bowtie filter to reduce CT radiation dose to patients. The aim was to determine how low CT doses can be, when utilised for PET AC, with and without the tin filter, whilst providing adequate PET quantification.MethodsA water-filled NEMA image quality phantom was imaged in three configurations with 18F-FDG: (1) water only (0HU); (2) with cylindrical insert containing homogenous mix of sand, flour and water (SFW, approximately 475HU); (3) with cylindrical insert containing sand (approximately 1100HU). Each underwent one-bed-position (26.3 cm) PET-CT comprising 1 PET and 13 CT acquisitions. CT acquisitions with tube current modulation were performed at 120 kV/50 mAs-ref (reference standard), 100 kV/7 mAs-ref (standard ULDCT for PET AC protocol), Sn140kV (mAs range 7–50-ref) and Sn100kV (mAs range 12–400-ref). PET data were reconstructed with μ-maps provided by each CT dataset, and PET activity concentration measured in each reconstruction. Differences in CT dose length product (DLP) and PET quantification were determined relative to the reference standard.ResultsAt each tube voltage, changes in PET quantification were greater with increasing density and reducing mAs. Compared with the reference standard, differences in PET quantification for the standard ULDCT protocol for the three phantoms were ≤ 1.7%, with the water phantom providing a DLP of 7mGy.cm. With tin filter at Sn100kV, differences in PET quantification were negligible (≤ 1.2%) for all phantoms down to 50mAs-ref, proving a DLP of 2.8mGy.cm, at 60% dose reduction compared with standard ULDCT protocol. Below 50mAs-ref, differences in PET quantification were > 2% for at least one phantom (2.3% at 25mAs-ref in SFW; 6.4% at 12mAs-ref in sand). At Sn140kV/7mAs-ref, quantification differences were ≤ 0.6% in water, giving 3.8mGy.cm DLP, but increased to > 2% at bone-equivalent densities.ConclusionsCT protocols for PET AC can provide ultra-low doses with adequate PET quantification. The tin filter can allow 60–87% lower dose than the standard ULDCT protocol for PET AC, depending on tissue density and accepted change in PET quantification.

Background The tin filter has allowed radiation dose reduction in some standalone diagnostic computed tomography (CT) applications. Yet, ‘low-dose’ CT scans are commonly used in positron emission tomography (PET)-CT for lesion localisation/characterisation (L/C), with higher noise tolerated. Thus, dose reductions permissible with the tin filter at this image quality level may differ. The aim was to determine the level of CT dose reduction permitted with the tin filter in PET-CT, for comparable image quality to the clinical reference standard (CRS) L/C CT images acquired with standard filtration. Materials and methods A whole-body CT phantom was scanned with standard filtration in CRS protocols, using 120 kV with 20mAs-ref for bone L/C (used in 18 F-Sodium Fluoride (NaF) PET-CT) and 40mAs-ref for soft tissue L/C (used in 18 F-Fluorodeoxyglucose (FDG) PET-CT), followed by tin filter scans at 100 kV (Sn100kV) and 140 kV (Sn140kV) with a range of mAs settings. For each scan, effective dose (ED) in an equivalent-sized patient was calculated, and image quality determined in 5 different tissues through quantitative (contrast-to-noise ratio) and qualitative (visual) analyses. The relative dose reductions which could be achieved with the tin filter for comparable image quality to CRS images were calculated. Results Quantitative analysis demonstrated dose savings of 50–76% in bone, 27–51% in lung and 8–61% in soft tissue with use of the tin filter at Sn100kV. Qualitative analysis demonstrated dose reductions using Sn100kV in general agreement with the dose reductions indicated by quantitative analysis. Overall, CT dose reductions of around 85% were indicated for NaF bone PET-CT, allowing whole-body CT at just 0.2mSv ED, and a 30–40% CT dose reduction for FDG PET-CT using Sn100kV (1.7-2.0mSv), providing comparable image quality to current CRS images with standard filtration. Sn140kV demonstrated limited value in CT dose reduction. Conclusions Large CT dose reductions can be made using the tin filter at Sn100kV, when imaging bone, lung and soft tissue at L/C level CT image quality in PET-CT. As well as reducing the risk of inducing a cancer in later life, such dose reductions may also impact PET-CT practice, such as justifying cross-sectional over planar imaging or justifying PET-CT in younger patients.

Bradley Derrickson, 16, of Kettering was listed in critical condition Sunday at Kettering Medical Center. Nina Lazzeroni, 45, of Huber Heights was in critical condition at Stouder Memorial Hospital in Troy. Lazzeroni was struck about 3:30 p.m. Saturday while standing at the motorcycle training area of the American Honda Motor Co. distribution plant, 101 Stanfield Road in Troy. Kettering Fire Department officials said a warning about the storm came into their department about 3:45 p.m. There were only a few visible lightning flashes, and the call for help from Oak Creek Park, where Derrickson was struck, came shortly after 4 p.m.

Background The aim of this project was to identify the top 10 priorities for childhood chronic conditions and disability (CCD) research from the perspectives of children and young people with lived experience, their parents and caregivers and the professionals who work with them. Methods We conducted a three‐stage study based on the James Lind Alliance priority‐setting partnership methods. It comprised two online surveys (n = 200; n = 201) and a consensus workshop (n = 21) with these three stakeholder groups in Australia. Results In the first stage, 456 responses were submitted, which were coded and collapsed into 40 overarching themes. In the second stage, 20 themes were shortlisted, which were further refined in stage 3, before the top 10 priorities being selected. Of these, the top three priorities were improving awareness and inclusion in all aspects of their life (school, work and social relationships), improving access to treatments and support and improving the process of diagnosis. Conclusions The top 10 priorities identified reflect the need to focus on the individual, health systems and social aspects of the CCD experience when conducting research in this area. Patient or Public Contribution This study was guided by three Advisory Groups, comprising (1) young people living with CCD; (2) parents and caregivers of a child or young person with CCD and (3) professionals working with children and young people with CCD. These groups met several times across the course of the project and provided input into study aims, materials, methods and data interpretation and reporting. Additionally, the lead author and seven members of the author group have lived and experienced CCD.

IntroductionA clinical registry is a systematically collected database of health-specific information about a patient population. Clinical registries can be used for a variety of purposes including surveillance, monitoring of outcomes and patient care. The establishment and maintenance of clinical registries come with a significant cost. This scoping review aims to identify the methods used to economically evaluate clinical registries including their costs and benefits.MethodsThis systematic scoping review protocol has been developed in accordance with the Preferred Reporting Items for Systematic Review and Meta-Analysis Protocols (PRISMA-P) guidelines. The final review will be reported following the Preferred Reporting Items for Systematic Reviews and Meta-Analyses extension for Scoping Reviews (PRISMA-ScR) checklist. The electronic databases Medline, Embase, Cochrane Library and The Cumulative Index to Allied Health Literature(CINAHL) database will be searched. Relevant national organisation websites will be searched to identify empirical studies within grey literature. The inclusion criteria include studies that economically evaluate clinical registries and are published in the English language from inception to February 2025. Two reviewers will independently screen 100% of titles and abstracts and full texts of studies for inclusion. Data will be extracted from eligible studies prior to being assessed for quality using a multi-tool approach.Ethics and disseminationThe findings of this review will be published in an international peer-reviewed journal. They are likely to be of interest to custodians of existing clinical registries and to those wishing to establish or evaluate clinical registries.KeywordsClinical registries, economic evaluation, costs, cost-effectiveness, health economics, registry based studies

Aim  We investigated relationships between hand function and genotype and aspects of phenotype in Rett syndrome. Method  Video assessment in naturalistic settings was supplemented by parent‐reported data in a cross‐sectional study of 144 females with a mean age of 14 years 10 months (SD 7y 10mo; range 2y–31y 10mo), 110 of whom had a mutation of the methyl CpG binding protein 2 (MECP2) gene. Ordinal logistic regression was used to assess relationships between hand function and MECP2 mutation, age, a modified Kerr score, Functional Independence Measure for Children (WeeFIM), ambulation level, and frequency of hand stereotypies. Results  Approximately two‐thirds of participants demonstrated purposeful hand function, ranging from simple grasping skills to picking up and manipulating small objects. In participants with a confirmed MECP2 mutation, those with the p.R168X mutation had the poorest hand function on multivariate analysis with C‐terminal deletion as the baseline (odds ratio [OR] 0.19; 95% confidence interval [CI] 0.04–0.95), whereas those with the p.R133C or p.R294X mutation had better hand function. Participants aged 19 years or older had lower hand function than those aged less than 8 years (OR 0.36; 95% CI 0.14–0.92). Factors that were associated with better hand function were lower Kerr scores for a 1‐point increase in score (OR 0.77; 95% CI 0.69–0.86), higher WeeFIM scores for a 1‐point increase in score (OR 1.08; 95% CI 1.04–1.12), and greater ambulation than those completely dependent on carers for mobility (OR 22.64; 95% CI 7.02–73.08). The results for participants with a confirmed pathogenic mutation were similar to results obtained when participants without a mutation were also included. Interpretation  Our novel assessment of hand function in Rett syndrome correlated well with known profiles of common MECP2 mutations and overall clinical severity. This promising assessment could measure clinical responses to therapy.

Background Early mobilization of adults receiving intensive care improves health outcomes, yet little is known about mobilization practices in paediatric intensive care units (PICUs). We aimed to determine the prevalence of and factors associated with physical rehabilitation in PICUs across Europe. Methods A 2-day, cross-sectional, multicentre point prevalence study was conducted in May and November 2018. The primary outcome was the prevalence of physical therapy (PT)- or occupational therapy (OT)-provided mobility. Clinical data and data on patient mobility, potential mobility safety events, and mobilization barriers were prospectively collected in patients admitted for ≥72 h. Results Data of 456 children admitted to one of 38 participating PICUs from 15 European countries were collected (456 patient days); 70% were under 3 years of age. The point prevalence of PT- and/or OT-provided mobility activities was 39% (179/456) (95% CI 34.7–43.9%) during the patient days, with significant differences between European regions. Nurses were involved in 72% (924/1283) of the mobility events; in the remaining 28%, PT/OT, physicians, family members, or other professionals were involved. Of the factors studied, family presence was most strongly positively associated with out-of-bed mobilization (aOR 7.83, 95% CI 3.09–19.79). Invasive mechanical ventilation with an endotracheal tube was negatively associated with out-of-bed mobility (aOR 0.28, 95% CI 0.12–0.68). Patients were completely immobile on 25% (115/456) of patient days. Barriers to mobilization were reported on 38% of patient days. The most common reported patient-related barriers were cardiovascular instability ( n  = 47, 10%), oversedation ( n  = 39, 9%), and medical contraindication ( n  = 37, 8%). Potential safety events occurred in 6% of all documented mobilization events. Conclusion Therapists are infrequently consulted for mobilization of critically ill children in European PICUs. This study highlights the need for a systematic and interdisciplinary mobilization approach for critically ill children. Graphical abstract

IntroductionIntentional injuries can be broadly classified into those that are self-inflicted (eg, suicide, self-harm), and those that are inflicted by others (eg, homicide, assault). Many risk factors are the same for all intentional injuries. It is widely accepted that there needs to be a public health approach to self-harm and interpersonal violence prevention, including surveillance of presentations to emergency departments. Self-harm and interpersonal violence are important causes of morbidity and mortality in Wales. Interpersonal violence surveillance is already operationalised in Wales, but variables are limited and case ascertainment may not be complete. There is no self-harm register. The aim of this study is to understand the utility of existing systems in North Wales that collect data about self-harm and interpersonal violence, and how a registry could be implemented to address any unmet needs.Methods and analysisThe project consists of five work packages. First, process mapping will be used to understand the pathways by which patients access emergency care, and how data are collected about patients. Second, routinely collected data will be explored to understand the burden of disease, and the strengths and limitations of existing data collection systems. Third, semi-structured interviews will be completed with stakeholders to understand their needs and experiences. Fourth, semi-structured interviews with third sector organisations which work with people with lived experience of self-harm or interpersonal violence will explore the acceptability of data collection. Fifth, a method will be developed that would enable economic evaluation of a self-harm and interpersonal violence register.Ethics and disseminationResults will be used to understand whether a self-harm and interpersonal violence registry is required in Wales. The results have the potential to influence local and national strategy on intentional injury prevention. Results will be disseminated to local services, regional and national programme teams, and published as a peer-reviewed journal article.

Self-harm registers (SHRs) are an essential means of monitoring rates of self-harm and evaluating preventative interventions, but few SHRs exist in countries with the highest burden of suicides and self-harm. Current international guidance on establishing SHRs recommends data collection from emergency departments, but this does not adequately consider differences in the provision of emergency care globally. We aim to demonstrate that process mapping can be used prior to the implementation of an SHR to understand differing hospital systems. This information can be used to determine the method by which patients meeting the SHR inclusion criteria can be most reliably identified, and how to mitigate hospital processes that may introduce selection bias into these data. We illustrate this by sharing in detail the experiences from a government hospital and non-profit hospital in south India. We followed a five-phase process mapping approach developed for healthcare settings during 2019–2020. Emergency care provided in the government hospital was accessed through casualty department triage. The non-profit hospital had an emergency department. Both hospitals had open access outpatient departments. SHR inclusion criteria overlapped with conditions requiring Indian medicolegal registration. Medicolegal registers are the most likely single point to record patients meeting the SHR inclusion criteria from multiple emergency care areas in India (e.g., emergency department/casualty, outpatients, other hospital areas), but should be cross-checked against registers of presentations to the emergency department/casualty to capture less-sick patients and misclassified cases. Process mapping is an easily reproducible method that can be used prior to the implementation of an SHR to understand differing hospital systems. This information is pivotal to choosing which hospital record systems should be used for identifying patients and to proactively reduce bias in SHR data. The method is equally applicable in low-, middle- and high-income countries.