[Observations on the temporal sequence of reported pregnancy risks].

A prospective study was conducted with 383 pregnant women concerning the occurrence in respect of time, the duration, and the mutual interactions of pregnancy risks. 35 per cent of the women with hemorrhages during early pregnancy later had premature labour pain (p less than 0.01). The relative risk of premature labour is greater by the factor 2.2 in pregnant women with hemorrhages during early pregnancy than in women without haemorrhages. There was no difference between the investigated groups in respect of onset and duration of these two risk factors. 54 per cent of the pregnant women in whom circular sature of the cervix according to Shirodkar had been performed, also had premature labour pain (p less than 0.001). After the performance of the Shirodkar suture, premature labour followed in 40% of the pregnant women during the further course of pregnancy, corresponding to a relative risk of 2.3 compared with the group without Shirodkar. Premature labour with subsequent Shirodkar cerclage occurred earlier (21st week) and lasted for a longer time (13 weeks) than with the reverse sequence or if premature labour occurred alone. If cervical insufficiency occurred first, followed by premature labour, the time of birth was definitely much earlier (36 weeks) than with the controls. There was no evident connection between the risks "infections of urinary tract" and "premature labour". On the other hand, 32 per cent of the pregnant women with urinary tract infections suffered an EPH gestosis, corresponding to a relative risk of 2 (p less than 0.001). The results show that clear and specific pointers towards the possible occurrence of other risks can be derived from the presence of certain pregnancy risks based on specific findings.