How to study stroke incidence
Because the issue of case ascertainment in studies of stroke incidence is important for the validity of such studies, we will discuss this point in more detail. Criteria by which the quality of population-based studies of stroke could be judged were published by Malmgren et al16 in 1987, and later u...
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Veröffentlicht in: | The Lancet (British edition) 2004-06, Vol.363 (9425), p.1920-1921 |
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Zusammenfassung: | Because the issue of case ascertainment in studies of stroke incidence is important for the validity of such studies, we will discuss this point in more detail. Criteria by which the quality of population-based studies of stroke could be judged were published by Malmgren et al16 in 1987, and later updated by Bonita17 and Sudlow and Warlow.2 Most recently, these criteria were further updated to include a large sample size to ensure a sufficient number of incident strokes each year, and also to present age-specific data on first-ever-in-a-lifetime and recurrent stroke in the oldest age groups (> or =85 years).11 [Peter Rothwell] and colleagues' study justifies a further expansion of these criteria by including two additional methods of case ascertainment. First, monthly searching of databases of general practitioners in the study area for all patients coded with a cerebrovascular diagnosis, with subsequent reviewing of all patients identified. Second, daily reviewing of all patients admitted to hospital with an acute vascular problem and all patients undergoing elective or emergency coronary, carotid, or peripheral vascular investigations or interventions. The use of these supplementary methods detected an additional 16% of new stroke events in Rothwell's study. Our experience in studies of stroke incidence, including a large recent Auckland Regional Community Stroke Study (2002-03), confirm the importance of these sources of information for complete ascertainment of cases. Together, this collective evidence allows us to suggest updated criteria for an ideal population-based study of stroke incidence (panel). |
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ISSN: | 0140-6736 1474-547X |
DOI: | 10.1016/S0140-6736(04)16436-2 |