• Blessing N R Jaja, Daniel Attalla, R Loch Macdonald, Tom A Schweizer, Michael D Cusimano, Nima Etminan, Daniel Hanggi, David Hasan, S Claiborne Johnston, Le RouxPeterP, Benjamin Lo, Ada Louffat-Olivares, Stephan Mayer, Andrew Molyneux, Adam Noble, Audrey Quinn, Thomas Schenk, Julian Spears, Jeffrey Singh, Michael Todd, James Torner, Ming Tseng, William van den Bergh, Mervyn D I Vergouwen, and George K C Wong.
• Division of Neurosurgery, Department of Surgery, St. Michael's Hospital, Labatt Family Centre of Excellence in Brain Injury and Trauma Research, Keenan Research Centre of the Li Ka Shing Knowledge Institute of St. Michael's Hospital, University of Toronto, 30 Bond Street, Toronto, ON, M5B 1W8, Canada.
• Neurocrit Care. 2014 Dec 1; 21 (3): 551-9.

AbstractResearchers and other stakeholders continue to express concern about the failure of randomized clinical trials (RCT) in subarachnoid hemorrhage (SAH) to show efficacy of new treatments. Pooled data may be particularly useful to generate hypotheses about causes of poor outcomes and reasons for failure of RCT in SAH, and strategies to improve them. Investigators conducting SAH research collaborated to share data with the intent to develop a large repository of pooled individual patient data for exploratory analysis and testing of new hypotheses relevant to improved trial design and analysis in SAH. This repository currently contains information on 11,443 SAH patients from 14 clinical databases, of which 9 are datasets of recent RCTs and 5 are datasets of prospective observational studies and hospital registries. Most patients were managed in the last 15 years. Data validation and quality checks have been conducted and are satisfactory. Data is available on demographic, clinical, neuroimaging, and laboratory results and various outcome measures. We have compiled the largest known dataset of patients with SAH. The SAHIT repository may be an important resource for advancing clinical research in SAH and will benefit from contributions of additional datasets.

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