The clinical significance of ultrasonographically detected subchorionic hemorrhages

摘要: Abstract OBJECTIVES: The null hypothesis is that there no difference in outcome when pregnancies with ultrasonographically documented subchorionic hemorrhages are compared those without these hemorrhages. STUDY DESIGN: We performed a case-control study, utilizing our computerized ultrasonographic database. Cases were matched two or three controls separate control groups. Matching criteria maternal age, gestational age at scan, and invasive procedures (chorionic villus sampling amniocentesis). General exclusion absence of fetal heart motion anomalies. Presence hemorrhage was an criterion for both groups; however, addition, presence vaginal bleeding further one the two. Statistical analysis χ 2 Yates' correction. Odds ratios 95% confidence intervals calculated. RESULTS: There characteristics between cases controls. incidence 1.3%. increased risk miscarriage (odds ratio 2.8, interval 1.7 to 7.4), stillbirth (4.5, 1.5 13.2), abruptio placentae (11.2, 2.7 46.4), preterm labor (2.6, 4.6) bleeding. These risks also comparison group bleeding, except respect miscarriage. In this case similar but mean birth weight lower than CONCLUSION: detected increases miscarriage, stillbirth, placentae, labor. alone appears increase It unclear whether causative it simply sign underlying process produces negative effects. (AM J OBSTET GYNECOL 1996;174:996-1002.)