• Roland D Thijs, David G Benditt, Christopher J Mathias, Ronald Schondorf, Richard Sutton, Wouter Wieling, and J Gert van Dijk.
• Dept. of Neurology and Clinical Neurophysiology, Leiden University Medical Centre, 9600, 2300 RC Leiden, The Netherlands.
• Clin. Auton. Res. 2005 Feb 1; 15 (1): 35-9.

BackgroundImprecise definitions of syncope and related conditions appear common in the medical literature. To investigate the scope of the problem we systematically searched for definitions in high-ranking medical journals.MethodsLiterature review of articles on 'syncope', 'neurocardiogenic syncope', 'neurally mediated syncope', 'orthostatic intolerance', and 'orthostatic hypotension' with these keywords in the title, mainly published in the ten journals with the highest impact in the fields of cardiology, internal medicine, and neurology.ResultsSyncope, neurocardiogenic syncope, neurally mediated syncope, orthostatic intolerance, and orthostatic hypotension were defined in only 41%, 34%, 26%, 38%, and 48% of papers respectively. Definitions, when given, differed considerably among papers. Orthostatic hypotension was most frequently defined, with an increase in number and consistency of definitions after publication of a consensus in 1996.ConclusionsSyncope and related conditions proved to be infrequently and inconsistently defined in current medical literature. The lack of consistent terminology is likely to harm medical education, research, and patient care. There is a strong need for a systematic terminology for syncope and related conditions.

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