Acute Ischaemic Stroke

Acute Ischaemic Stroke




Intracerebral Haemorrhage








Observational Data




The Virtual International Stroke Trials Archive (VISTA) is a collaborative venture that collates data from completed clinical trials and provides access to anonymised data for novel exploratory analyses to inform clinical trial design.

Across the entire archive, data are available on more than 82,000 individual patients and are stored anonymously.

Using this resource, specific questions can be answered concerning:

  • the natural history of specific population subgroups
  • the optimal selection of patients for future trials
  • choice of outcome measures for future trials
  • the influence of country, concomitant disease and other factors on recovery.

VISTA-Acute is governed by a Steering Committee, comprising contributing trialists and sponsors; these members oversee the use of contributed data and approve all proposed projects.

An overview of VISTA is detailed in the following papers.
Ali M, Bath PMW, Curram J, Davis SM, Diener HC, Donnan GA, Fisher M, Gregson BA, Grotta JC, Hacke W, Hennerici MG, Hommel M, Kaste M, Marler JR, Sacco R, Teal P, Wahlgren NG, Warach S, Weir CJ and Lees KR. The Virtual International Stroke Trials Archive. Stroke 2007;38:1905-1910.
Ali M, Bath P, Brady M, Davis S, Diener H-C, Donnan G, Fisher M, Hacke W, Hanley DF, Luby M, Tsivgoulis G, Wahlgren N, Warach S, Lees KR, on behalf of the VISTA Steering Committees, Development, Expansion and Use of a Stroke Clinical Trials Resource for Novel Exploratory Analyses, International Journal of Stroke 2012;7: 133-138
Diener HC, Weimar C, Ali M, Lees KR, Die virtuelle internationale Schlaganfallstudien-Archiv (VISTA) – Bedeutung für die Schlaganfallforschung, Akt Neurol 2009;36:174-179
Weimar C, Ali M, Lees KR, Donnan GA, Diener HC, for the VISTA Steering Committee. The Virtual International Stroke Trials Archive (VISTA) – Results and impact on future stroke trials and management of stroke patients. International Journal of Stroke 2010; 5: 103-109.

Our international Steering Committees peer-review and contribute expertise to submitted proposals and subsequent publications, improving the likelihood of publication in a high impact journal

Development of Researchers

VISTA provides access to a network of international researchers, clinicians and trialists across a range of disciplines. We welcome research exchanges and knowledge transfer through Training Visits to collaborating institutions. Successful Training Visits have taken place at University of Glasgow, UK, the Karolinska Institute, Sweden, Johns Hopkins University, USA, and Masaryk University, Czech Republic. For more information on becoming a VISTA Fellow, please contact

What is in it for established investigators?

Combined Datasets
While each contributing investigator has exceptional credibility and already has access to a large dataset, analyses from combined datasets benefit from enhanced statistical power, improved generalisability and greater validity.

Because publications are authored including the byline “on behalf of the VISTA Collaborators”, steering committee members are specifically acknowledged. Medline credits the listed steering committee for the full range of publications that arise.

Members of the VISTA steering committee can apply to use data from VISTA. They may also contribute as co-authors to others’ analyses when they have a major research interest or may delegate their rights to a suitably qualified collaborator.

VISTA does not support re-analysis of specific trials or use of trial datasets for meta-analysis of treatment effects originally studied by the trial. Data contributors are each members of the steering committee and therefore have influence over the approval of projects.

Thus, VISTA collaborators will find that they are not relinquishing their rights but instead gaining new opportunities.

What is in it for industry?

VISTA is an elegant solution.
Commercial sponsors own the intellectual property residing in trial data collected for a particular purpose. The community, on the other hand, now expects that these data should be made publicly available if additional health improvement can be gained without compromising that company’s rights. This raises ethical, scientific, legal and commercial challenges for large companies.  Hence, VISTA is an elegant solution, as it is an independent 3rd party platform that analyses and disseminates the data that would be mutually beneficial to the public and commercial sponsors, without compromising any patent or commercially viable aspects.  Where necessary, datasets restricted to control groups can be donated.

Guaranteed protection against re-anaylsis of data.
Most companies struggle to resource repeated requests for data or for analyses of data held in-house. They also struggle to operate an approvals system for use of the data much beyond the first year or two after the completion of a trial.  VISTA takes over these responsibilities and guarantees protection as there is no risk of re-analysis of any data used for a regulatory submission, publication or patent application. VISTA, has been successful in obtaining data from large pharmaceutical companies including Glaxo-Smith-Kline, Pfizer, AstraZeneca, Boehringer-Ingelheim, Janssen and Bayer.

Data access, extraction and analyses- at low cost
VISTA also offers commercial sponsors and its investigators access to their own contributed data for the purposes of a subgroup analysis, at no extra cost and hassle-free, subject to approval from the original trial’s steering committee. VISTA has been able to sustain this access for many years. Data are anonymised with regards to trial source, patient identity and are only released with masking of treatment allocation.

Representation on VISTA
Sponsors of trials held within VISTA may nominate an appropriate academic lead (often the chairperson of their trial steering committee) to represent their trial on the VISTA steering committee. The sponsor may also nominate a company representative to the industry committee or statistical committee.

What does Glasgow contribute and gain?

Data management and administration
The University of Glasgow hosts the Virtual Trials Archives, comprising VISTA, VICCTA and VIRTTA– holding and managing securely data and administering the collaborations’ funds – without charging overheads on  income.

The University benefits indirectly from being associated with high quality research output, from maintaining links with leading clinical researchers and from helping in the development of future researchers

How can this assist fellows in building their research career?

Embarking on a clinical research programme often involves a long period of data collection and considerable delay in gaining experience with data analysis or publication. VISTA provides extensive validated data to enable quality research to be completed in minimal time.

Peer review opportunity       
Proposals are reviewed by the VISTA steering committee before approval, and manuscripts are also reviewed before submission. This unparalleled opportunity strengthens the research and enhances the potential impact of the research work.

Input from senior experts – co-authors in publications      
Some senior experts from VISTA may choose to join as co-authors, and the opportunity to publish alongside recognised experts can enhance the research fellow’s CV.

Personal links
The personal links that are built through VISTA collaborations may facilitate exchange visits or experience in other countries that are invaluable in planning a career path.

What is in it for the field?

Analyses can influence:

  • Research trial design; example: choice of selection criteria and outcome measures in stroke trials
  • Clinical treatment guidelines; example: use of thrombolysis in very elderly stroke patients
  • Regulatory submissions; example: papers on use of thrombolysis in patients with existing cautions and contraindications for intravenous alteplase in acute stroke

How is it funded?

VISTA is currently subsidised by the University of Glasgow and will run as a full not-for-profit collaboration in the future. It will derive sufficient income to be self-sustaining from subscriptions from the users of the data and from small grants to support specific projects. There is no charge for data donors to access their own contributed data. For other users and for investigators seeking new data, there is a limited project subscription that covers membership of VISTA during a project plus the actual cost of extracting relevant data from the archive.  The limited income from these charges will be used to maintain and expanding the archive. Overheads of VISTA include provision of administrative and website maintenance.

What assistance can VISTA provide for projects?

  • Expert review from steering committee on proposals and manuscripts
  • Management and coordination of permissions and feedback
  • Assistance with data selection and extraction
  • Feasibility check on proposed research
  • In-depth knowledge of original trials
  • Opportunity to plan and undertake analysis in Glasgow or work remotely

What are the eligibility criteria for new datasets?

Membership of VISTA is open to all trials and registries that meet the eligibility criteria for each of the Acute, Rehab, ICH, Prevention, Imaging, Plus, and Cognition Archives.

How are data stored?

The data are stored securely for VISTA at the Robertson Centre for Biostatistics, University of Glasgow, United Kingdom. The Robertson Centre can also provide excellent professional statistical support.

Dar Dowlatshahi
Ottawa Hospital Research Institute and the University of Ottawa, Canada
"The VISTA collaboration provided my team with critical data to launch a series of projects around Intracerebral Hemorrhage (ICH). The VISTA team was extremely supportive, provided valuable advice and responded very quickly to requests."
Benedikt Frank
Department of Neurology, University of Duisburg-Essen, Essen, Germany
"Kindness, helpfullness, professional support and a wild countryside are the first words that come to my mind when I think of my 10 months in Glasgow. I got an optimal insight into the work with a big database. I received plenty support to conceptualise the corresponding analysis-plans. I was guided to draft scientifically sound manuscripts."

Latest News

15 Nov 2018

We are pleased to report that the following project proposal has been accepted by the VISTA-Acute Steering Committee: J. Voisey et al, “Stroke Outcome Prediction.”

15 Nov 2018

We are pleased to report that the following project proposal has been accepted by VISTA-Acute Steering Committee: M. Borsody, et al, ”Development of an Artificial Intelligence-Based Stroke Diagnostic Tool.”

08 Nov 2018

Congratulations to Jeffrey Wing and his team on the acceptance of his VISTA abstract entitled “Predicting ordinal functional outcome at 90-days post intracerebral hemorrhage” for oral presentation at ISC 2019

K. R. Lees
VISTA-Acute Chair
M.C. Brady
VISTA-Rehab Chair
H-C Diener
VISTA-Prevention Chair
N-G Wahlgren
VISTA-Plus Chair
VISTA-Plus Co-Chair
S. Warach
VISTA-Imaging Chair
W. Hacke
VISTA-Endovascular Chair
M. Dichgans
VISTA-Cognition Chair
T. Quinn
VISTA-Cognition Co-Chair