OBJECTIVE: To evaluate if idiopathic spontaneous preterm delivery is associated with abnormal uteroplacental circulation, as assessed by Doppler velocimetry. METHODS: The study was carried out on 417 women who had Doppler velocimetry performed between 25-36 weeks' gestation and were subsequently delivered vaginally. The systolic-diastolic ratio (S/D) was computed for the uterine and umbilical arteries, and the outcomes of pregnancies with spontaneous preterm and term deliveries were compared. RESULTS: Uterine artery S/D was significantly higher (P < .0001) in the 31 patients delivered preterm, whereas no significant difference was observed in the umbilical S/D. Abnormal values of uterine S/D were detected in 58.1% of the preterm group, independent of the gestational age at examination. No significant increase in S/D was observed in patients hospitalized for preterm labor who delivered subsequently at term. Spontaneous preterm delivery was associated with increased uterine S/D among both pregnancies with small for gestational age fetuses and those with appropriately grown fetuses. CONCLUSION: Preterm delivery is associated with modifications of uterine artery Doppler velocimetry, suggesting that impaired trophoblastic invasion of the placental bed may play a role in determining preterm delivery.
OBJECTIVE: To evaluate if idiopathic spontaneous preterm delivery is associated with abnormal uteroplacental circulation, as assessed by Doppler velocimetry. METHODS: The study was carried out on 417 women who had Doppler velocimetry performed between 25-36 weeks' gestation and were subsequently delivered vaginally. The systolic-diastolic ratio (S/D) was computed for the uterine and umbilical arteries, and the outcomes of pregnancies with spontaneous preterm and term deliveries were compared. RESULTS: Uterine artery S/D was significantly higher (P < .0001) in the 31 patients delivered preterm, whereas no significant difference was observed in the umbilical S/D. Abnormal values of uterine S/D were detected in 58.1% of the preterm group, independent of the gestational age at examination. No significant increase in S/D was observed in patients hospitalized for preterm labor who delivered subsequently at term. Spontaneous preterm delivery was associated with increased uterine S/D among both pregnancies with small for gestational age fetuses and those with appropriately grown fetuses. CONCLUSION: Preterm delivery is associated with modifications of uterine artery Doppler velocimetry, suggesting that impaired trophoblastic invasion of the placental bed may play a role in determining preterm delivery.
Authors: Roberto Romero; Juan Pedro Kusanovic; Tinnakorn Chaiworapongsa; Sonia S Hassan Journal: Best Pract Res Clin Obstet Gynaecol Date: 2011-03-08 Impact factor: 5.237
Authors: JoonHo Lee; Roberto Romero; Yi Xu; Jezid Miranda; Wonsuk Yoo; Piya Chaemsaithong; Juan Pedro Kusanovic; Tinnakorn Chaiworapongsa; Adi L Tarca; Steven J Korzeniewski; Sonia S Hassan; Nandor Gabor Than; Bo Hyun Yoon; Chong Jai Kim Journal: Am J Reprod Immunol Date: 2013-08 Impact factor: 3.886
Authors: Terry K Morgan; Jorge E Tolosa; Lisa Mele; Ronald J Wapner; Catherine Y Spong; Yoram Sorokin; Donald J Dudley; Alan M Peaceman; Brian M Mercer; John M Thorp; Mary Jo O'Sullivan; Susan M Ramin; Dwight J Rouse; Baha Sibai Journal: J Matern Fetal Neonatal Med Date: 2012-12-12