| Abstrakt: |
BackgroundIntracranial venous thrombosis (ICVT) accounts for around 0.5% of stroke, with an estimated annual incidence of 3–4/million. We aimed to validate ICD-10 codes for the identification of adult ICVT admissions, and to estimate of incidence.MethodsData were collected for all admissions over 5 years to a regional neurosciences centre serving a 1.5 million population. We searched for the following ICD-10 codes at any position: G08.X (Intracranial and intraspinal phlebitis and thrombophlebitis), I67.6 (Nonpyogenic thrombosis of intracranial venous system), I63.6 (Cerebral infarction due to cerebral venous thrombosis, nonpyogenic), O22.5 (Cerebral venous thrombosis in pregnancy) and O87.3 (Cerebral venous thrombosis in the puerperium).ResultsSixty-five admissions were identified, covering 40 unique ICVT cases. The positive predictive value for all the admissions combined was 92.3% (60 out of 65), with individual code results as follows: G08.X 91.5% (54 out of 59), O225 100% (4 out of 4), I67.6 100% (1 out of 1), I63.6 100% (1 out of 1) and O87.3 100% (1 out of 1). The estimated annual incidence of ICVT was at least 5/million.ConclusionAll codes were associated with a high positive predictive value for ICVT. As demonstrated in previous studies, ICVT incidence may be underestimated. |
