Validity of Stroke Diagnosis on Hospital Discharge Records in Saskatchewan, Canada: Implications for Stroke SurveillanceLiu L.a · Reeder B.a · Shuaib A.b · Mazagri R.c
aDepartment of Community Health and Epidemiology, University of Saskatchewan, and bSaskatchewan Stroke Research Centre and cDepartment of Neurosurgery, Royal University Hospital, University of Saskatchewan, Saskatoon, Canada
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This study examines the validity of the diagnosis of stroke on hospital discharge records in Saskatchewan, Canada. In total, 1,494 records with a discharge diagnosis of ‘stroke’ or a ‘stroke-related condition’ were reviewed. The clinical algorithm of the 1980 USA National Survey of Stroke was considered the ‘gold standard’. The positive predictive value of a primary diagnosis of stroke in the tertiary-care hospitals was about 90%. In community hospitals the majority of stroke cases were coded as ICD9 436 in which the positive predictive value was 78%. The variation between regions would limit the use of hospital discharge data for stroke surveillance.
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