Results In groups treated with hirudo ( in contrast with the control one), the cerebral edema descended, the necrotic lesion of the nervus tissue and the neuron ischemic changes reduced, new capillaries, gitter cells, astrocytes, neuroglial fibres and argentophil fibres increased obviously. 结果:药物治疗组脑水肿、脑组织坏死及神经元缺血变化减轻;新生毛细血管、格子细胞、星形细胞数目明显增加,胶质纤维生成增多。