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Background and Purpose: Symptomatic intracranial hemorrhage (sICH) is the most serious adverse event in stroke patients who received i.v. rt-PA and is usually associated with poor outcomes. The SEDAN score is built up to predict sICH. We aim to externally validate the SEDAN score in Thai patients from single center in the real world practice. Materials and Methods: The SEDAN score of stroke patients treated with intravenous rt-PA at Thammasat University Hospital from January 2010 to June 2012 was calculated. Patients were divided into three groups including symptomatic intracranial hemorrhage (sICH), asymptomatic intracranial hemorrhage (AsICH) and no intracerebral hemorrhage (NoICH). The primary outcome of analyses was sICH. Each parameter of the SEDAN score and correlation between score and sICH were analyzed with univariate and multivariate model. Results: 295 patients (18.6% of stroke admission) were treated with i.v. rt-PA. 13 patients (4.4%) had sICH and 31 patients (10.4%) had AsICH. Baseline blood sugar >12 mmol/l, early infarction, hyperdense cerebral artery, age >75 years-old and NIHSS ≥10(SEDAN) were associated with sICH by univariate analysis (P value = 0.018, <0.001, <0.001, 0.002 and 0.027 respectively). The rate of sICH occurrence was increased in accordance with the increasing of the SEDAN score. By multivariate analysis, odds ratio of baseline blood sugar > 12 mmol/l, early infarction, hyperdense cerebral artery, age >75 years-old and NIHSS ≥ 10 were 1.248, 2.503, 1.107, 1.532 and 1.263 respectively. Conclusions: The SEDAN score was practical to use and predictive in Thai population. Each parameter of the SEDAN score was an independent risk factor for sICH after treatment with i.v. rt-PA. [ABSTRACT FROM AUTHOR]