Reduced frequency of hypertensive disorders in placenta previa

Leiberman, J. R.; Fraser, Debbie; Kasis, A; Mazor, Melissa

doi:10.1016/0020-7292(92)91000-e

Cited by 21 publications

(41 citation statements)

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“…The risk of developing preeclampsia was not increased in this investigation by the site of placental implantation. Other investigators have reported a reduced risk with low implantation 2 and increased risk with unilateral implantation. 4 The investigation by Gonser et al 4 studies prospectively only 184 pregnant women in the association of lateral implantation with the 3400 in our study and the increased risk of preeclampsia, whereas the Leiberman study 2 compared 491 women with placenta previa among a population of 106 866 women with normally implanted placentas.…”

Section: Placental Location Ef Magann Et Almentioning

confidence: 87%

“…Only a limited number of investigations have dealt with the placental implantation site and pregnancy outcomes. [2][3][4][5][6][7] In this investigation, in pregnancies with a low placental implantation, there was an increased risk of preterm labor and preterm delivery at 14 to 22 weeks. This association was present Other include: NRST/low BP, HIV, oligohydramnios, polyhydramnios, seizure disorder, PTL, congenital abnormalities.…”

Section: Discussionmentioning

confidence: 99%

“…If the leading edge of the placenta remains within 2 cm of the internal os over the course of the pregnancy, this frequently leads to an abdominal delivery because of the unacceptably high risk of hemorrhage with a vaginal delivery. 1 Pregnancies complicated by placenta previa are reported to have a reduced risk of hypertensive disorders of pregnancy compared with normally implanted placentas 2 and low lying placentas (placentas in the lower uterine segment but which are not placenta previas) are associated with an increased risk of postpartum hemorrhage. 3 Other placental implantation sites have been associated with adverse maternal and neonatal outcome in small investigations.…”

Section: Introductionmentioning

confidence: 99%

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Second trimester placental location as a predictor of an adverse pregnancy outcome

et al. 2006

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Objective: To determine if the second trimester placental location is associated with perinatal outcomes. Materials and methods:Observational study of placental location and the subsequent risk of an adverse pregnancy outcome. Placental location was divided into three categories, low, high lateral and high fundal.Results: There were 3336 pregnancies analyzed in this study. Low implantation sites had a greater risk of preterm labor (odds ratio (OR) 1.70, 95% confidence interval (CI) 1.38 to 2.90, P<0.001), preterm delivery (OR 1.86, 95% CI 1.36 to 2.54, P<0.001), fewer fetuses with macrosomia (OR 0.56, 95% CI 0.38 to 0.83, P ¼ 0.010) and reduced risk of postpartum hemorrhage (OR 0.56, 95% CI 0.46 to 0.95, P ¼ 0.026). High lateral implantations had a greater risk of low 1-min (OR 1.80, 95% CI 1.11 to 2.93, P ¼ 0.017) and 5-min (OR 3.49, 95% CI 1.46 to 8.36, P ¼ 0.005) Apgar scores.Conclusions: Low placental implantation was associated with an increased risk of preterm labor, preterm delivery and a reduced risk of postpartum hemorrhage, and of a macrosomic fetus. High lateral implantation was associated with low Apgar scores.

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Section: Placental Location Ef Magann Et Almentioning

confidence: 87%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Second trimester placental location as a predictor of an adverse pregnancy outcome

et al. 2006

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“…Low implantation of the placenta reportedly protects against the development of preeclampsia [2,8,12]. Proposed etiologies of this protective effect include, 1) high (fundal) implantation being associated with increased uteroplacental drainage through the kidney, producing toxemia [2]; 2) local effects of the low implanted placenta causing increased placental blood flow, protecting against preeclampsia [12]; 3) improved placental blood flow at the low implanted placenta because of proximity to the uterine artery [8].…”

Section: Introductionmentioning

confidence: 97%

Is placenta previa a determinant of preeclampsia?

Jelsema

Bhatia²,

Zador³

et al. 1991

Jpme

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Low implantation of the placenta has been reported to be associated with a decreased risk for preeclampsia and this has been attributed to increased placental blood flow. However, placenta previa is known to be associated with separation and bleeding, intrauterine growth retardation, and elevated umbilical blood flow resistance by Doppler studies, suggesting decreased umbilical blood flow. To better evaluate the relationship of placenta previa and preeclampsia, 6576 consecutive patients who had ultrasound examination after 28 weeks gestation and delivery at our institution were studied. The placental location, parity, maternal weight, development of preeclampsia, and gestational age were evaluated by using frequency tables and stepwise discriminant analysis. Results showed that placenta previa is not a significant determinant of the development of preeclampsia, but parity, maternal weight, and gestational age contributed significantly to the development of preeclampsia. The finding of decreased incidence of preeclampsia with previa is explained not by increased placental blood flow but by associated maternal characteristics, and particularly by the strong association of previa with premature delivery.

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“…The isthmic segment of the uterine artery's ascending branch has a wider diameter and a freer course than distal parts of blood vessels in placenta previa. It was previously suggested that a better blood supply and oxygenation might be provided in cases of placenta previa as a consequence of this condition (8). Factors, such as advanced maternal age, multiparity, prior cesarean delivery, multiple pregnancies, prior spontaneous or induced abortions, maternal smoking, and drug abuse, increase the occurrence of placenta previa (3).…”

Section: Discussionmentioning

confidence: 99%

Changes in first trimester screening test parameters in pregnancies complicated by placenta previa and association with hyperemesis gravidarum

Tülek¹,

Kahraman²,

Taşkın³

et al. 2014

J Turkish German Gynecol Assoc

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Results: Beta human chorionic gonadotropin (BhCG) multiples of medians (MoMs) and nuchal translucency (NT) MoMs were significantly higher in the placenta previa group in comparison with the low lying placenta and control groups. Apgar scores at both the 1st and 5th minutes were significantly lower in the placenta previa group. Hyperemesis gravidarum was found to be significantly more frequent in the placenta previa group. Conclusion:The prevalence of hyperemesis gravidarum in the first trimester is higher in pregnancies complicated by placenta previa. Paying more attention to the development of placenta previa in the routine pregnancy follow-up of patients with hyperemesis gravidarum could be considered. (J Turk Ger Gynecol Assoc 2014; 15: 212-6) Key words: Placenta previa, hyperemesis gravidarum, first trimester screening, BhCG, PAPP-A Received: 15 April, 2014 Accepted: 19 September, 2014 Changes in first trimester screening test parameters in pregnancies complicated by placenta previa and association with hyperemesis gravidarum AbstractOriginal Investigation 212 neural tube defects were intended to be excluded from the study; however, neither of the situations was found amongst the randomly selected women. First trimester screening test parameters of these women were obtained. Placenta previa was classified as 4 types. The term "type 1 placenta previa (low lying placenta)" was used for women with a placental edge between 2-5 cm from internal cervical os. "Type 2 placenta previa (marginal placenta previa)" was described as a placental edge between 0-2 cm far from the internal cervical os. "Type 3 placenta previa (partial placenta previa)" was defined as a placenta partially covering the internal cervical os. "Type 4 placenta previa (complete placenta previa)" was described as a placenta fully covering the internal cervical os. Cases of placenta previa were diagnosed with trans-abdominal ultrasound, and the diagnosis was confirmed by trans-vaginal ultrasound. For the first trimester screening tests, plasma samples were collected following nuchal translucency (NT) measurements. Collected plasma samples were analyzed within 3 hours for beta human chorionic gonadotropin (BhCG) (Siemens 06601846 Immulite® Free Beta hCG Kit; Siemens Medical Solutions Diagnostics, London, United Kingdom) and pregnancy-associated plasma protein A (PAPP-A) (Siemens 06609553 Immulite® 2500 PAPP-A Kit; Siemens Medical Solutions Diagnostics, London, United Kingdom). All cases with a low lying placenta had attempted spontaneous or induced vaginal deliveries. All cases that had type 2, type 3, or type 4 placenta previa had elective or emergent cesarean sections and were included in the placenta previa group. Cases with a low lying placenta were included in another study group, and 90 women without placenta previa were established as the control group. Categorical variables were expressed as number and percentages. Non-parametric data were compared by Kruskal-Wallis test. P values less than 0.05 were considered statistically signific...

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Reduced frequency of hypertensive disorders in placenta previa

Cited by 21 publications

References 0 publications

Second trimester placental location as a predictor of an adverse pregnancy outcome

Second trimester placental location as a predictor of an adverse pregnancy outcome

Is placenta previa a determinant of preeclampsia?

Changes in first trimester screening test parameters in pregnancies complicated by placenta previa and association with hyperemesis gravidarum

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