Validity of Stroke Diagnosis on Hospital Discharge Records in Saskatchewan, Canada: Implications for Stroke SurveillanceLiu L. · Reeder B. · Shuaib A. · Mazagri R.
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
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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