A randomized trial of micronized progesterone for the prevention of recurrent preterm birth.

We sought to evaluate the effectiveness of daily oral micronized progesterone (MP) in preventing recurrent spontaneous preterm birth (RSPB) and whether MP increases maternal serum progesterone. We performed a pilot, single-center, randomized, double-blind, placebo-controlled trial in women with a prior preterm birth and current singleton gestation at 16 to 20 weeks ( N = 33). The primary outcome was the rate of RSPB. Subjects were given either daily MP (400 mg) or placebo from 16 to 34 weeks. Serum progesterone was obtained at enrollment and in the late second/early third trimester. Pregnancy outcome data were collected. RSPB occurred in 5/19 (26.3%) in the MP group versus 8/14 (57.1%) in placebo group ( P = 0.15). The mean age at delivery was 37.0 ± 2.7 weeks for the MP group versus 35.9 ± 2.6 weeks for the placebo ( P = 0.3). Mean serum progesterone at 28 weeks was 122.6 ± 61.8 pg/mL for MP group versus 90.1 ± 38.7 pg/mL for placebo ( P = 0.19). MP was associated with a trend toward a reduction in RSPB and an increase in the maternal serum progesterone. Although the primary outcome in this pilot study did not reach statistical significance, the results suggest a favorable trend meriting further investigation.

Pregnancy-related changes in the size of uterine leiomyomas.

OBJECTIVE: To describe the effects of pregnancy on the growth of leiomyomas using sonographic measurements of leiomyomas taken longitudinally during pregnancy. STUDY DESIGN: The study population included asymptomatic gravidas with singleton pregnancies in whom we identified uterine leiomyomas. We included all women whose leiomyomas were measured at least twice during the pregnancy. In a subgroup of women we also compared the size of leiomyomas before and after the index pregnancy. Using real-time sonography, we measured each leiomyoma in 3 axes and averaged the measurements. During subsequent studies we calculated the percent change in the size of each tumor. We assessed complications related to the presence of these tumors. RESULTS: We evaluated 137 leiomyomas in 72 women (average, 2.3 +/- 1.8 per woman). Each underwent an average of 3.7 +/- 2.1 scans. The average gestational age at the time of first assessment was 14.4 +/- 5.4 weeks. The average diameter of the leiomyomas at the first study was 34.2 +/- 23 mm. On average, there was no significant change in the size of leiomyomas during pregnancy. We found that the size, location and our ability to visualize leiomyomas varied significantly during pregnancy. Four of the 72 women had obstetric complications related to the presence of leiomyomas. CONCLUSION: The findings of our longitudinal sonographic assessment of 137 uterine leiomyomas suggest that despite the commonly held belief that they tend to enlarge during the course of pregnancy, this phenomenon is in fact quite rare.

Perinatal outcome associated with sonographically detected globular placenta.

OBJECTIVE: To evaluate the association between the sonographic appearance of globular placenta and perinatal outcome. STUDY DESIGN: We prospectively followed the pregnancy course and perinatal outcome in women with globular placentas (hyperechoic, thick and highly vascular placentas with edges that lack the typical "tapering" appearance) during routine sonographic study. RESULTS: Fourteen women were included. In 7 women the globular appearance of the placenta normalized spontaneously, and perinatal outcome was good. The other 7 experienced poor perinatal outcomes. There were no significant differences between the 2 groups. Among pregnancies in which the globular placental appearance persisted, 3 resulted in fetal demise; 3 women had severe intrauterine growth restriction and oligohydramnios and underwent cesarean deliveries at 26, 27 and 31 weeks, respectively; and 1 patient had premature preterm rupture of membranes and underwent a cesarean delivery due to placental abruption. CONCLUSION: In half the pregnancies complicated by the sonographic appearance of a globular placenta, this shape spontaneously normalized, and the perinatal outcome was normal. However, when the globular appearance of the placenta persisted, the condition was associated with a poor perinatal outcome. Pregnancies complicated by a globular placenta should be followed closely.