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Mild stroke: safety and outcome in patients receiving thrombolysis.

OBJECTIVES: The aim of this study was to compare the short-term clinical outcome of patients with acute cerebral ischemia and mild symptoms receiving rt-PA with that of patients with acute cerebral ischemia and mild symptoms not treated with rt-PA, and to investigate the frequency of symptomatic intracranial hemorrhage (sICH) in these patients.

MATERIALS AND METHODS: All patients with confirmed ischemic stroke/TIA and mild symptoms were included. Mild symptoms were defined as NIHSS score≤5 on admission. Functional outcome was assessed with modified Rankin Scale (mRS) at day 7 or at earlier discharge. Excellent outcome was defined as mRS=0. sICH was defined according to both NINDS and ECASS III criteria.

RESULTS: Of 2753 patients with confirmed ischemic stroke/TIA admitted between February 2006 and February 2013, 966 (35.3%) were excluded because of having admission NIHSS>5. A total of 1791 patients presented with mild symptoms on admission (NIHSS≤5), of which 158 (8.8%) patients received rt-PA. Treatment with rt-PA and early admission were independently associated with excellent outcome. Higher NIHSS score on admission and prior ischemic stroke were independently associated with poor outcome. Three (1.9%) sICH were diagnosed in rt-PA-treated patients and one (0.1%) in patients not receiving rt-PA.

CONCLUSIONS: This study highlights the efficacy of rt-PA in patients with acute cerebral ischemia presenting with mild symptoms and confirms the low-risk profile of this treatment.

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