Objective: To devise preventive measures for stillbirths, which account for more than 70% of perinatal deaths in Japan.
Methods: We retrospectively reviewed the medical records of 77 women with singleton pregnancies who gave birth to stillborn infants at > or = 30 weeks between 1979 and 1996 at our hospital.
Results: Major malformations were present in 21 (27%) of 77 infants, including 11 infants with anencephaly. Two infants (2.6%) were severely hydropic. Preeclampsia preceded the stillbirth and might have been an indirect cause of stillbirth in 21 (39%) of 54 women whose infants had normal formations. The cause of stillbirth in 33 non-preeclamptic women was unclear in 15 (28%), abruptio placentae in 9, fetal growth retardation in 3, the HELLP syndrome in 3, chorioamnionitis in 2, and cord accident in 1. Abruptio placentae also occurred in 9 of 21 preeclamptic patients. Thus, abruptio placentae was responsible for 18 (33%) of 54 stillborn infants with a grossly normal appearance. An autopsy was performed on only 13 (24%) of 54 infants with grossly normal appearance and did not provide new information relating to deaths.
Conclusions: The causes of stillbirth were many and varied, with a large proportion having no obvious cause, although autopsies were underused. Increased monitoring for women with preeclampsia and early diagnosis and prompt delivery for women with abruptio placentae might be helpful in reducing the number of stillbirths.