<シンポジウム4>脳梗塞急性期に有効な薬物療法 脳塞栓症に対する急性期血栓溶解術の適応決定-側副血行・残存血流の評価の重要性-<Simposium 4>The effective medichal treatment of acute cerebral infarction. Importance of evaluations of collateral flow and residual cerebral blood flow in acute fibrinolytic therapy for thromboembolic stroke in anterior circulation