Akerlund M
Acta Obstet Gynecol Scand. 1978;57(5):479-81. doi: 10.3109/00016347809156534.
Myometrial activity and endometrial blood flow were recorded in a patient with uterine haemorrhage and lower abdominal pain, who turned out to have a tubal pregnancy. The uterine contractions had an amplitude sometimes exceeding 400 mmHg and a duration up to 3.5 min. Thus, strong uterine contractions can appear during pregnancy without the presence of a gestational sac within the uterus. This is contrary to the assumption that processes in the foetal membranes initiate the sequence of events leading to abortion or labour.
对一名患有子宫出血和下腹痛的患者记录了子宫肌层活动和子宫内膜血流情况，结果发现该患者为输卵管妊娠。子宫收缩幅度有时超过400 mmHg，持续时间长达3.5分钟。因此，妊娠期间子宫可出现强烈收缩，而子宫内并无妊娠囊。这与胎膜中的过程引发导致流产或分娩一系列事件的假设相反。
