text: 当心腔内膜，特别是心瓣膜存在病理改变或先天性缺损时，细菌易在心瓣膜、心内膜和动脉内膜表面粘着、繁殖，从而形成心内膜炎；但若形成一种病变尚需下列条件，即双侧心室或大血管之间有较大的压力差，能够产生高速的血流，经常冲击心内膜面，使之损伤，心内膜下胶原组织暴露，血小板和纤维蛋白聚积形成无菌性赘生物，当有菌血症时，细菌易在上述部位黏附、定居，并繁殖，形成有菌赘生物。
entities.entity: 心腔内膜
entities.label: bod
entities.entity: 心瓣膜
entities.label: bod
entities.entity: 细菌
entities.label: mic
entities.entity: 心瓣膜
entities.label: bod
entities.entity: 心内膜
entities.label: bod
entities.entity: 动脉内膜
entities.label: bod
entities.entity: 心内膜炎
entities.label: dis
entities.entity: 大血管
entities.label: bod
entities.entity: 心内膜
entities.label: bod
entities.entity: 心内膜
entities.label: bod
entities.entity: 血小板
entities.label: bod
entities.entity: 纤维蛋白
entities.label: bod
entities.entity: 菌血症
entities.label: dis
entities.entity: 细菌
entities.label: mic