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Annual transition of the proportion of culprit occluded arteries (%). The incidence of ICA or BA occlusion tended to increase after approval of IV t-PA in contrast with MCA occlusion (ICA, p = 0.031; BA, p = 0.053; MCA, p = 0.026). BA: basilar artery, ICA: internal carotid artery, IV t-PA: intravenous thrombolysis using tissue plasminogen activator, MCA: middle cerebral artery.
