Introduction: In studies on aneurysmal subarachnoid hemorrhage (SAH), substantial variability exists in the use and timing of outcomes and endpoints, which complicates interpretation and comparison of results between studies. The aim of the National Institute of Health/National Institute of Neurological Disorders and Stroke/National Library of Medicine Unruptured Intracranial Aneurysm (UIA) and SAH common data elements (CDE) Project was to provide a common structure for future UIA and SAH research. Methods: This article summarizes the recommendations of the UIA and SAH CDE Outcomes and Endpoints sub‑ group, which consisted of an international and multidisciplinary ad hoc panel of experts in clinical outcomes after SAH. Consensus recommendations were developed by review of previously published CDEs for other neurological diseases and the SAH literature. Recommendations for CDEs were classifed by priority into “Core,” “Supplemental— Highly Recommended,” “Supplemental,” and “Exploratory.” Results: The subgroup identifed over 50 outcomes measures and template case report forms (CRFs) to be included as part of the UIA and SAH CDE recommendations. None was classifed as “Core”. The modifed Rankin Scale score and Montreal Cognitive Assessment were considered the preferred outcomes and classifed as Supplemental—Highly Recommended. Death, Glasgow Outcome Scale score, and Glasgow Outcome Scale-extended were classifed as Supplemental. All other outcome measures were categorized as “Exploratory”. We propose outcome assessment at 3 months and at 12 months for studies interested in long-term outcomes. We give recommendations for standardized dichotomization.Conclusion: The recommended outcome measures and CRFs have been distilled from a broad pool of potentially useful CDEs, scales, instruments, and endpoints. The adherence to these recommendations will facilitate the compari‑ son of results across studies and meta-analyses of individual patient data.

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Keywords Clinical studies, Common data elements, Data coding, Data collection, Subarachnoid hemorrhage, Aneurysm, Outcomes, Endpoints, Standardization, Hemorrhagic stroke, Modifed Rankin Scale, Montreal Cognitive, Assessment, mRS, MoCA
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Journal Neurocritical Care
Stienen, M.N., Visser-Meily, J.M., Schweizer, TA, Hanggi, D., Macdonald, RL, & Vergouwen, M.D.I. (2019). Prioritization and Timing of Outcomes and Endpoints After Aneurysmal Subarachnoid Hemorrhage in Clinical Trials and Observational Studies: Proposal of a Multidisciplinary Research Group. Neurocritical Care, 30, 102–113. doi:10.1007/s12028-019-00737-0