Acute lower limb ischaemia (ALI) is a life- and limb-threatening vascular emergency requiring urgent intervention. Despite advancements in therapeutic strategies, outcome reporting for ALI remains inconsistent, limiting evidence synthesis and guideline development. The CORE-ALI study aims to develop a Core Outcome Set (COS) to standardise outcome reporting and ensure the inclusion of both clinical and patient-centred metrics.

CORE-ALI will use a structured, multi-phase methodology guided by the Core Outcome Measures in Effectiveness Trials (COMET) initiative and the Core Outcome Set-STAndards for Reporting (COS-STAR) guidelines. Phase 1 involves stakeholder engagement through semi-structured interviews with patients, clinicians and policymakers from diverse European healthcare systems. Qualitative data will be analysed using thematic analysis to generate a preliminary list of outcomes. In Phase 2, a multi-round Delphi survey (anticipated two to three rounds) will prioritise and refine outcomes through consensus building, with quantitative data analysed using descriptive and non-parametric statistical methods. Phase 3 will culminate in a consensus meeting to finalise the COS. Multilingual accommodations will ensure inclusivity, and General Data Protection Regulation (GDPR)-compliant platforms will secure data handling.

The study has received ethics approval from the Ethics Committee of the Medical University of Innsbruck (EK Nr: 1082/2025) on 20/05/2025. Additional local ethics approvals are required and will be obtained at all participating sites prior to the initiation of recruitment. The final Core outcome set will be disseminated through peer-reviewed publications, presentations at international conferences and engagement with professional societies and patient organisations.

COMET initiative (Registration No. 3346).

Patient-reported experience measures (PREMs) capture patients’ healthcare journey experiences. No validated PREMs are specific to vascular surgery patients. This study aims to develop and validate a vascular surgery-specific PREM to assess patient experience and satisfaction.

Patient Reported Experience Measures In Vascular Surgery Enhancement Study is a two-phase multisite sequential mixed-methods study. The qualitative phase will develop a draft PREM; the quantitative phase will validate it. The study will be conducted across three major vascular units in Wales. Up to 40 patients and healthcare professionals will participate in the qualitative phase. Approximately 150–200 patients will be recruited for the quantitative validation. Inclusion criteria are: (1) age ≥18; (2) recent vascular procedure; (3) inpatient vascular care; (4) not cognitively impaired; (5) consent to participate and (6) English or Welsh proficiency. Primary outcomes will be construct validity and reliability. Secondary outcomes will include patient engagement, healthcare provider perspectives and health system impacts. Thematic analysis will be conducted using NVivo. Psychometric validation will include item analysis, internal consistency testing and factor analysis.

The study was approved by the London—Camberwell St Giles Research Ethics Committee, coordinated by the Health Research Authority and Health and Care Research Wales (REC reference: 24/PR/0522).

NCT06363175.