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IntroductionPatients with complex multimorbidity face a high treatment burden and frequently have low quality of life. General practice is the key organisational setting in terms of offering people with complex multimorbidity integrated, longitudinal, patient-centred care. This protocol describes a pragmatic cluster randomised controlled trial to evaluate the effectiveness of an adaptive, multifaceted intervention in general practice for patients with complex multimorbidity.Methods and analysisIn this study, 250 recruited general practices will be randomly assigned 1:1 to either the intervention or control group. The eligible population are adult patients with two or more chronic conditions, at least one contact with secondary care within the last year, taking at least five repeat prescription drugs, living independently, who experience significant problems with their life and health due to their multimorbidity. During 2023 and 2024, intervention practices are financially incentivised to provide an extended consultation based on a patient-centred framework to eligible patients. Control practices continue care as usual. The primary outcome is need-based quality of life. Outcomes will be evaluated using linear and logistic regression models, with clustering considered. The analysis will be performed as intention to treat. In addition, a process evaluation will be carried out and reported elsewhere.Ethics and disseminationThe trial will be conducted in compliance with the protocol, the Helsinki Declaration in its most recent form and good clinical practice recommendations, as well as the regulation for informed consent. The study was submitted to the Danish Capital Region Ethical Committee (ref: H-22041229). As defined by Section 2 of the Danish Act on Research Ethics in Research Projects, this project does not constitute a health research project but is considered a quality improvement project that does not require formal ethical approval. All results from the study (whether positive, negative or inconclusive) will be published in peer-reviewed journals.Trial registration numberNCT05676541.

IntroductionThis study aimed to either identify or develop and validate a patient-reported outcome measure (PROM) to assess treatment burden related to general practice for patients with multimorbidity, which can be used alongside the MultiMorbidity Questionnaire part 1 (MMQ1) without overwhelming the target population with redundant items.MethodsWe conducted a systematic literature review to identify all existing PROMs measuring treatment burden. If no suitable PROM was found, our plan was to: (1) develop a draft PROM using items from existing instruments, (2) carry out group and individual interviews with patients with multimorbidity to ensure the PROM’s understandability, clarity, completeness and relevance and (3) undertake psychometric validation with a diverse sample of primary care patients with chronic conditions.ResultsWe did not identify an eligible PROM in the literature review. The draft PROM consisted of 30 items divided into six domains; Information about treatment, Challenges with medication, Medical appointments, Self-monitoring, Health behaviour and Challenges in the contact to the health system. In the psychometric validation, neither these domains nor any other theoretical constellation of items had adequate psychometric properties. Individual items had good criterion validity and sensitivity to change.ConclusionsIn this study, we developed a 30-item PROM with high content validity where various individual items showed adequate criterion validity and sensitivity to change, making these items useful as a supplemental measure to the MMQ1.Trial registration number NCT05676541 Registration Date: 16 December 2022.