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Vol. 9, No. 4, 1999
Issue release date: July–August 1999

Validity of Stroke Diagnosis on Hospital Discharge Records in Saskatchewan, Canada: Implications for Stroke Surveillance

Liu L. · Reeder B. · Shuaib A. · Mazagri R.
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Abstract

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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