This study assessed whether a previously developed Monte Carlo simulation model can be reused for evaluating various strategies to minimise time-to-treatment in southwest Netherlands for endovascular thrombectomy (EVT) in patients who had an ischaemic stroke.

Reuse of a previously developed simulation model to simulate various strategies in another region, using prospectively collected data from stroke centres and retrospective data from emergency medical services.

Data from 509 patients who had an ischaemic stroke (≥18 years) treated with EVT (2014–2018) were used.

Input for the simulation model reuse included distributions of observed time delays along the acute stroke pathway. Validation of the baseline models was based on face validity and statistical measures (patient data vs model output) using the Assessment of the Validation Status of Health Economic decision models tool. We simulated strategies for a subregion: interhospital patient transfer by helicopter, transport of the neurointerventionalist to the primary stroke centre (‘drive-the-doctor’), interhospital patient transfer to a thrombectomy-capable stroke centre (TSC) outside the region and prehospital triage using the Rapid Arterial Occlusion Evaluation (RACE) scale.

Onset-to-groin time was the outcome.

Reuse of the original simulation model was obtained by minimal effort, implying limited adaptation. Compared with the baseline model, interhospital patient transfer by helicopter or to a TSC outside the region and prehospital routing using the RACE scale reduced mean onset-to-groin time by 16, 13 and 39 min, respectively (95% CrI for all: equal to the point estimate). ‘Drive the doctor’ reduced mean onset-to-groin time by 27 (car), 49 (ambulance) or 58 min (helicopter), each with a 95% CrI equal to the point estimate.

The original simulation model can be applied to different regions in the Netherlands. Strategies tested within the subregion resulted in promising results of ‘drive the doctor’ and prehospital patient routing using the RACE scale.

Indigenous Mayan-Yucatecan communities in Mexico have a high prevalence of chronic non-communicable diseases (NCDs) such as diabetes, hypertension, obesity and rheumatic diseases (RMDs). According to the syndemic theory, these diseases combined with social, economic and cultural factors affect the quality of life. The aim of this protocol is to describe the methodological process to create, implement and evaluate a Syndemic-Based Care Model (SCM), using a Community Based-Participatory Research (CBPR) strategy in three Mayan-Yucatecan communities.

This is a convergent mixed-methods protocol. The quantitative component is a before-after study, and the qualitative component is an ethnographic study. The intervention will be a SCM co-constructed with Mayan communities based on their particular needs and aiming for reduction of the negative impact of NCD/RMD through a multidisciplinary approach. We will follow four phases of the CBPR: (1) situational analysis, through community censuses and semistructured interviews to understand the prevalence of NCDs and the syndemics in these communities; (2) co-construction of the elements of a SCM based on the health priorities identified by researchers, community members and healthcare workers; (3) implementation of this SCM and (4) evaluation of the SCM through (1) statistical analyses involving the construction of a syndemic index through stepwise logistic regression of the normalised and standardised key clinical, social and economic variables; interval and ratio variables will be normalised by their z-score and categorical variables will be one-hot encoded; similarity and social networks analysis with clustering to identify syndemic subpopulations; and cost-effectiveness and cost-utility analyses using Markov modelling and (2) narrative and thematic qualitative analysis of the SCM’s implementation and impact on community members’ health, function and quality of life.

Research ethics boards of participant institutions approved this research protocol. This project will be presented to municipal authorities, community meetings and community leaders for observation and acceptance. For people who wish to participate, informed consent will be provided written and verbally in Spanish or Mayan-Yucatecan according to the participant preferences, and it can be signed by either autograph or fingerprint. The results of this research will be disseminated to various groups: (a) local and regional authorities of the Mexican health system and municipal authorities; (b) the participating communities will be informed in an assembly of the results and (c) academic dissemination will be done through publications in public science journals and institutional press releases and will also be presented at national and international congresses or symposia.