• Philippe Bijlenga, Akio Morita, Nerissa U Ko, J Mocco, Sandrine Morel, Yuichi Murayama, WermerMarieke J HMJHDepartment of Neurology, Leiden University Medical Center, Leiden, The Netherlands., Robert D Brown, and Unruptured Cerebral Aneurysms and SAH CDE Project Investigators.
• Neurosurgery, Department of Clinical Neurosciences, Faculty of Medicine, Geneva University, Rue Gabrielle-Perret-Gentil 4, 1211, Geneva 14, Switzerland. philippe.bijlenga@hcuge.ch.
• Neurocrit Care. 2019 Jun 1; 30 (Suppl 1): 20-27.

BackgroundThe National Institute of Neurological Disorders and Stroke (NINDS) Common Data Elements (CDEs) have been generated to standardize and define terms used by the scientific community. The widespread use of these CDEs promotes harmonized data collection in clinical research. The aim of the NINDS Unruptured Intracranial Aneurysms (UIA) and Subarachnoid Hemorrhage (SAH), and Subject Characteristics working group (WG) was to identify, define, and classify CDEs describing the characteristics of patients diagnosed with an UIA and SAH. Thus, "Participant/Subject characteristics" is a set of factors defining a population of selected individuals and allowing comparisons with a reference population and overtime.MethodsBased on standard terms defined by the United States' Census Bureau, CDEs previously defined by several (Stroke, Epilepsy and Traumatic Brain Injury) NINDS CDE working groups literature and expert opinion of the WG, the "Participant/Subject characteristics" domain has been defined.ResultsA set of 192 CDEs divided in 7 subsections: demographics (8 CDEs), social status (8 CDEs), behavioral status (22 CDEs), family and medical history (144 CDEs), pregnancy and perinatal history (8 CDEs), history data source reliability (3 CDEs), and prior functional status (3 CDEs) was defined. SAH is characterized by 6 core elements, all classified in the "Participant/Subject characteristics" domain. Four exploratory elements out of the 39 for SAH overall are in the "Participant/Subject characteristics" domain, and all remaining 182 CDEs in the "Participant/Subject characteristics" domain are classified as Supplemental-Highly Recommended elements.ConclusionsThese CDEs would allow the development of best practice guidelines to standardize the assessment and reporting of observations concerning UIA and SAH.

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