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Dichorionic Twins (dichorionic + twin)

Distribution by Scientific Domains

Medical Sciences	42%

Selected Abstracts

A longitudinal study of diurnal variation in baseline fetal heart rate in one dichorionic-diamniotic twin pregnancy

PSYCHIATRY AND CLINICAL NEUROSCIENCES, Issue 3 2001
Masami Muro MD
Abstract A longitudinal study to analyse the diurnal variations in baseline fetal heart rate (FHR) and sustained fetal tachycardia (SFT) in twin pregnancy was performed on one dichorionic twin. Twenty-four hour FHR recordings on twins were made at 32, 34 and 36 weeks of gestation simultaneously. Significant diurnal variations were found in both twins in all gestational weeks. The diurnal variations in baseline FHR of twins were highly correlated with no phase-lag. No coincidence was recognized in the appearance of SFT between twins. These results suggest the maternal influence equally affects FHR in each fetus of dichorionic twin since 32 weeks of gestation, while the appearance of SFT might be independent from maternal influence. [source]

Monochorionic and dichorionic twin pregnancies discordant for fetal anencephaly: a systematic review of prenatal management options

PRENATAL DIAGNOSIS, Issue 4 2008
Annelies Lust
Abstract The aim of this study was to evaluate the effect of selective feticide (SF) compared to expectant management (EM) on perinatal outcome in dichorionic and monochorionic twins discordant for anencephaly. For this purpose, we conducted a systematic review of literature and added ten unpublished cases. As a result, we found that in dichorionic twins, mean gestational age (GA) at birth in the SF group was 38.0 weeks versus 34.9 weeks (P = 0.0002). Mean birth weight was 2922 g in the SF group versus 2474 g (P = 0.03). In monochorionic twins, mean GA at birth was 35.2 weeks versus 32.7 weeks (P = 0.1). Mean birth weight was 2711 g versus 1667 g (P = 0.0001). We conclude that while SF does not reduce perinatal mortality, it does result in significantly longer gestations and higher birth weight, and appears to be the management of choice in dichorionic twins discordant for anencephaly. In monochorionic twins, SF also increases birth weight, but in view of the complexity of this group, no clear recommendations can be made. Copyright © 2008 John Wiley & Sons, Ltd. [source]

Nuchal translucency in dichorionic twins conceived after assisted reproduction

PRENATAL DIAGNOSIS, Issue 6 2006
P. W. Hui
Abstract Objectives As opposed to biochemical markers of Down syndrome, nuchal translucency (NT) was once thought to be a more reliable screening marker for high order multiple pregnancies and pregnancies conceived after assisted conception. Recent data suggested that NT in singleton fetuses from assisted reproduction technology (ART) was thicker than those from singleton pregnancies. The present study compared the thickness of NT in dichorionic twins from natural conception and assisted reproduction. Methods A retrospective analysis for comparison of NT thickness on 3319 spontaneous singletons, 19 pairs of spontaneous twins and 27 pairs of assisted reproduction twins was performed. Results The median NT multiple of median (MoM) of spontaneous singletons was 1.00. For twins, the median NT MoM for pregnancies after assisted reproduction and natural conception were 1.02 and 1.07 respectively. There was no statistical difference in the NT thickness among the three pregnancy groups. Conclusion Contrary to the observed increase in NT in singleton pregnancies from assisted reproduction, the NT in dichorionic twins was comparable to the spontaneous ones. The mode of conception appears to impose differential influence on singletons and twins. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Screening for trisomy 21 in twin pregnancies in the first trimester: does chorionicity impact on maternal serum free ,-hCG or PAPP-A levels?

PRENATAL DIAGNOSIS, Issue 9 2001
Kevin Spencer
Abstract In a study of 180 twin pregnancies I have examined the distribution of maternal serum free ,-human chorionic gonadotrophin (,-hCG) and pregnancy-associated plasma protein-A (PAPP-A), in addition to fetal nuchal translucency thickness (NT), in twins classified as monochorionic or dichorionic, based on ultrasound appearance at 10,14 weeks of gestation. In 45 monochorionic and 135 dichorionic twin pregnancies the median MoM free ,-hCG was not significantly different (1.00 vs 1.01), whilst that for PAPP-A was lower (0.89 vs 1.01) but again with no statistical significance. Previous reports of an increased fetal NT in monochorionic twins pregnancies could not be confirmed (1.03 vs 1.00). It is concluded that the existing pseudo risk twin correction algorithm is appropriate for both monochorionic and dichorionic twins in providing accurate first trimester risks for trisomy 21. Copyright © 2001 John Wiley & Sons, Ltd. [source]

Prognosis for the co-twin following single-twin death: a systematic review

BJOG : AN INTERNATIONAL JOURNAL OF OBSTETRICS & GYNAECOLOGY, Issue 9 2006
SSC Ong
Background, Following single-twin death, the perinatal mortality and morbidity for the surviving co-twin is increased but difficult to quantify. We present data on prognosis from a systematic review. Objectives, We aimed to determine the incidence of a) co-twin death, b) neurological abnormality and c) preterm delivery for the surviving co-twin following single-twin death after 14 weeks of gestation. Search strategy, Literature was identified by searching two bibliographical databases and specialist journals between 1990 and 2005. Selection criteria, The selected studies of ,5 cases reported on perinatal death and/or neurodevelopmental delay of the surviving co-twin. Data collection and analysis, Studies were assessed for quality and data extracted to allow computation of rates. The data were inspected for heterogeneity using a Forrest plot and examined statistically using the chi-square test. Data from individual studies were pooled within subgroups defined by prognosis. Main results, The search strategy yielded 632 potentially relevant citations. Full manuscripts were retrieved for 54 citations and 28 studies were finally included in the review. Following the death of one twin, the risk of monochorionic and dichorionic co-twin demise was 12% (95% CI 7,11) and 4% (95% CI 2,7), respectively. The risk of neurological abnormality in the surviving monochorionic and dichorionic co-twin was 18% (95% CI 11,26) and 1% (95% CI 0,7), respectively. The risk of preterm delivery was 68% (95% CI 56,78) and 57% (95% CI 34,77), respectively. Where there was comparative data within studies, the odds of monochorionic co-twin intrauterine death was six times that of dichorionic twins (OR 6.04 [95% CI 1.84,19.87]). Neurological abnormality was also higher in monochorionic compared with dichorionic pregnancies (OR 4.07 [95% CI 1.32,12.51]). Author's conclusions, More prospective research is required to inform decision making on this subject, especially with data that allow stratification based upon chorionicity. [source]