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ACHTSAM study protocol: outreach diagnostics and assessment of tolerability in severe ME/CFS--a pilot study

Por: Fricke · C. · Deibert · P. · Maier · P. · Kern · W. · Krumnau · O. · Barsch · F.
Introduction

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is a severe, multisystem condition that often emerges after viral infections and affects physical and cognitive function. Severely affected patients are underrepresented in research due to immobility and exertional intolerance.

Methods

This is a prospective, non-interventional observational study investigating the feasibility and tolerability of home-based diagnostics in patients with severe and very severe ME/CFS. Phase 1 includes remote identification using validated questionnaires. Phase 2 involves home visits for physiological, cognitive and biological assessments. The primary outcome is feasibility; secondary outcomes include tolerability and methodological barriers.

Ethics/dissemination

The study protocol was approved by the Ethics Committee of the University of Freiburg (No. 25-1031-S1). Written informed consent is obtained from all participants. Results will be disseminated via peer-reviewed publications and patient support groups.

Trial registration number

DRKS00035231; FRKS005506.

Inducible immortalized Dendritic Cells enable antigen-specific antibody production in a murine <i>in vitro</i> Immunization model

by Juliane Egert, Natalia Maier, Burkhard Micheel, Katja Hanack

Transferring the complexity of the in vivo immune response into a controlled in vitro system represents a promising strategy for the rapid generation of antigen-specific antibodies while significantly reducing the reliance on animal experimentation, thus adhering to the 3Rs principle. In this study, we present an in vitro immunization (IVI) approach that employs conditionally immortalized dendritic cells (DCs), derived from a transgenic irtTA-GBD/T-Ag mouse model, to initiate antigen-specific immune responses in vitro. These dendritic cells can be kept in a proliferative state under tetracycline-controlled expression of the SV40 large T antigen (termed iniDCs) and maintained long-term in culture. Upon de-induction of the immortalizing transgene, the resulting deinduced iniDCs (de-iniDCs) regain physiological properties and exhibit full functional maturation in response to appropriate stimuli. When co-cultured with naïve murine T and B lymphocytes, these mature de-iniDCs are capable of initiating antigen-specific adaptive immune responses, culminating in the production of antigen-specific antibodies by B cells. By utilizing this standardized population of antigen-presenting cells, we have established a robust and reproducible IVI protocol that enables the generation of antigen-specific antibody responses in vitro. Antibody-secreting B cells were subsequently fused with myeloma cells, and antigen-specific hybridomas were rapidly identified and isolated using the novel selma (selection of monoclonal antibody) technology, allowing for an accelerated and efficient selection of antigen-specific monoclonal antibodies.

Surgery versus conservative management for severe pectus excavatum (RESTORE): protocol for a multicentre, randomised, controlled superiority trial

Por: Maier · R. · Dunning · J. · Wason · J. · Chadwick · T. · Bryant · A. · Fernandez-Garcia · C. · Vale · L. · Danjoux · G. R. · Wallace · G. · Levett-Renton · A. · Naidu · B. · Pryor · C. · McCulloch · P. · Thursfield · R. · Wyllie · J. · Chang · L. · Marsay · L. · Akowuah · E.
Introduction

Severe pectus excavatum (PE) may impair cardiopulmonary and physical function. The effectiveness of surgical treatment to correct PE and restore physical function is widely debated due to a lack of high-quality comparative evidence. The RESTORE trial aims to determine the clinical and cost-effectiveness of corrective surgery for severe PE compared with conservative management for the first time in a randomised controlled trial (RCT).

Methods and analysis

RESTORE is a pragmatic, multicentre, RCT with an embedded observational cohort. 200 participants aged ≥12 years with severe PE will be recruited at around 12 National Health Service cardiothoracic surgical centres in England. Participants will be randomised 1:1 to receive either surgery within 3 months of randomisation (intervention arm) or no surgery until after the primary outcome measurement at 1 year (comparator arm). The primary outcome is change in physical functioning from baseline to 1 year as measured by the Short Form Health Survey (SF-36v2) physical function score. The primary economic outcome is cost-effectiveness. The key secondary outcome is change in % predicted VO2peak at 1 year measured by cardiopulmonary exercise test (CPET). Outcomes will be assessed at 1 year post-randomisation in the comparator arm and 1 year post-surgery in the intervention arm. The primary analyses will be undertaken on an intention-to-treat population using a linear mixed-effects model, adjusted for stratification variables via a binary covariate. Other secondary outcomes will include change from baseline of cardiopulmonary function (CPET and spirometry), health-related quality of life using the EuroQol 5 Dimension 5 Level (EQ-5D-5L) and SF-36v2 questionnaires, Hospital Anxiety and Depression Scale and disease specific symptoms (Phoenix Comprehensive Assessment for Pectus Excavatum Symptoms and Pectus Excavatum Evaluation Questionnaire). Adverse events, complications from surgery and operative technical success (Haller and Compression Indices from preoperative and postoperative CT scans) will also be assessed. Health economic analysis will estimate the incremental cost per quality adjusted life year at 1 year.

Ethics and dissemination

The trial was approved by East of Scotland Research and Ethics Service (24/ES/0034). Participants who are ≥16 years of age will be required to provide written informed consent. For participants

Trial registration number

ISRCTN11359779.

Development and validation of a postoperative risk calculator (POP-score) for patients undergoing cardiac surgery: a retrospective cohort study

Por: Pölzl · L. · Sutter · C. · Lohmann · R. · Eder · J. · Ioannou-Nikolaidou · M. · Engler · C. · Graber · M. · Naegele · F. · Hirsch · J. · Maier · S. · Ulmer · H. · Mathis · S. · Reinstadler · S. J. · Grimm · M. · Bonaros · N. · Holfeld · J. · Gollmann-Tepeköylü · C.
Objectives

This study aimed to identify intraoperative and perioperative factors influencing 30-day mortality after cardiac surgery and to develop a risk score (POP-score) for its prediction.

Design

Retrospective cohort study with multivariable regression analysis.

Setting

A tertiary care cardiac surgery centre in Austria; data from consecutive patients undergoing cardiac surgery between 2010 and 2020 were analysed.

Participants

A total of 8072 patients were included. The cohort was randomly divided into a derivation cohort (75%) and a validation cohort (25%).

Outcome measures

The primary outcome measure was 30-day mortality. We analysed associations between intraoperative and perioperative variables and 30-day mortality, assessed via multivariable regression analysis.

Results

Several factors were significantly associated with 30-day mortality, including intraoperative RBC transfusion (OR 3.407 (95% CI 2.124–5.464)), postoperative high-sensitive cardiac troponin T cut-off levels (OR 2.856 (95% CI 1.958 to 4.165)), need for dialysis/haemofiltration (OR 2.958 (95% CI 2.013 to 4.348)) and temporary extracorporeal membrane oxygenation support (OR 5.218 (95% CI 3.329 to 8.179)) (p

Conclusions

The validated POP-score provides an improved tool for predicting 30-day mortality after cardiac surgery by incorporating intraoperative and perioperative factors alongside the EuroSCORE II. Although model performance was evaluated using 7-day peak troponin data, the score can be calculated within the first 72 hours postoperatively in most patients, supporting its clinical applicability for early decision-making, resource allocation and patient counselling. Further research is warranted to assess its clinical utility in diverse populations.

DISTRACT study: evaluating kaleidoscope distraction as part of multimodal pain management in paediatric dressing changes - study protocol of a single centre randomised trial

Por: Haverkamp · F. J. C. · Naidoo · R. · Muhrbeck · M. · Pompermaier · L. · Wladis · A. · van Laarhoven · C. J. H. M. · Tan · E. C. T. H.
Introduction

Procedure-related pain should be minimised to prevent psychological trauma and the potential negative consequences on body physiology. Dressing changes in paediatric patients with burn injuries are frequently performed with analgesics alone where sedation is not indicated, especially in minor and superficial burns. It is hypothesised that distraction methods can be used in addition to pain alleviating medication to reduce the experience of pain in these patients.

Objective

With this research project, we aim to assess the effectiveness of a simple, inexpensive, non-electronic distraction method, a kaleidoscope, to reduce acute pain experienced in paediatric patients undergoing dressing changes in the outpatient clinic.

Methods and analysis

A randomised controlled trial will be performed at the Ngwelezana Tertiary Hospital, Empangeni, South Africa. Paediatric patients between the ages of 5 years and 12 years with minor and superficial partial thickness burn injuries who require dressing changes in the outpatient clinic, without sedation, will be randomised into two groups with a 1:1 allocation ratio. Fixed randomisation will be performed by a computer random number generator. The control group will receive standard practice of care which concerns a dressing change without any distraction methods, and the intervention group will receive distraction by use of a kaleidoscope as an additional method for potential pain alleviation. Patients in both groups will receive paracetamol or non-steroidal anti-inflammatory drugs when indicated according to hospital protocol. The primary outcome will be the change in pain score from pre-procedural to pain score during the dressing change and will be analysed with a linear regression analysis. Additionally, subanalyses will be performed to evaluate potentially modifying factors on the treatment effect. This will also be evaluated with a linear regression analysis and correlated with caregiver and healthcare worker observational pain scores. Participants and assessors are not blinded to group assignment due to the nature of the intervention. To achieve a power of 80% and a level of significance of 5% for detecting at least a 1-point difference in change in pain scores between the intervention and control group, a sample size of 50 patients in each group is required.

Ethics and dissemination

This study evaluates a non-invasive adjunct to reduce pain in children who undergo a painful procedure. Ethical approval has been granted from the University of Kwazulu-Natal’s biomedical research and ethics committee and the ethics and research committee of Ngwelezana Tertiary Hospital prior to recruitment (ref no. BREC/00005194/2023). Written informed consent will be acquired from all study participants’ caregivers. Study findings will be presented orally to staff at the paediatric burn unit of Ngwelezana Tertiary Hospital (study location). The research methodology and results will be presented at scientific conferences and will be submitted for publication in a peer-reviewed journal.

Trial registration number

NCT06591195.

A Systematic Review of Features Forecasting Patient Arrival Numbers

imageAdequate nurse staffing is crucial for quality healthcare, necessitating accurate predictions of patient arrival rates. These forecasts can be determined using supervised machine learning methods. Optimization of machine learning methods is largely about minimizing the prediction error. Existing models primarily utilize data such as historical patient visits, seasonal trends, holidays, and calendars. However, it is unclear what other features reduce the prediction error. Our systematic literature review identifies studies that use supervised machine learning to predict patient arrival numbers using nontemporal features, which are features not based on time or dates. We scrutinized 26 284 studies, eventually focusing on 27 relevant ones. These studies highlight three main feature groups: weather data, internet search and usage data, and data on (social) interaction of groups. Internet data and social interaction data appear particularly promising, with some studies reporting reduced errors by up to 33%. Although weather data are frequently used, its utility is less clear. Other potential data sources, including smartphone and social media data, remain largely unexplored. One reason for this might be potential data privacy challenges. In summary, although patient arrival prediction has become more important in recent years, there are still many questions and opportunities for future research on the features used in this area.
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