先兆子痫与胎盘螺旋动脉阻塞有关。遗传性出血倾向可引起胎盘血管栓塞。为验证先兆子痫患者继发性静脉血栓栓塞危险性较高的假说,查阅并收集加拿大Ontario医院管理数据库自1990年4月1日～1994年1月1日间以第9次修订版国际疾病分类编码确定的先兆子痫、严重的先兆子痫、子痫或毒 Pre-eclampsia is associated with obstruction of the spiral artery of the placenta. Hereditary bleeding tendency can cause placental vascular embolism. To validate the hypothesis of a higher risk of secondary venous thromboembolism in preeclampsia, access to and collect data from the Ontario Hospital Management Database in Canada for the 9th revised edition of International Diseases, April 1, 1990 to January 1, 1994 Classification codes identify pre-eclampsia, severe pre-eclampsia, eclampsia or poison