Valor preditivo do resultado fetal da dopplervelocimetria de ducto venoso entre a 11ª e a 14ª semanas de gestação

Gollo, Carlos Alberto; Murta, C. G. V.; Bussamra, L. C. S.; Santana, R. M.; Moron, Antônio Fernandes

doi:10.1590/s0100-72032008000100002

Cited by 6 publications

(1 citation statement)

References 14 publications

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“…FHR and PI are two indices of linear dynamics that can be analyzed in the time and frequency domain. The variability of FHR is influenced by the autonomic nervous system, the fetal body, respiratory movements, baroreflex, and circadian processes (23). A study showed differences in FHR variability in the 1st trimester compared to the 2nd and 3rd trimesters.…”

Section: Discussionmentioning

confidence: 99%

Characterization of the normal fetal circulatory system of the ductus venosus using sound complexity parameters

Souza,

Carvalho,

Souza

et al. 2023

Braz J Med Biol Res

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The aim of this study was to characterize the normality of the fetal circulatory system through the time between ventricular systoles of the ductus venosus in the three gestational trimesters in healthy fetuses using nonlinear methods of the complexity of the signal. A prospective cohort study was conducted at the Instituto de Medicina Integral Prof. Fernando Figueira (IMIP) from December 2019 to May 2020. Pregnant women between 11 and 14 weeks, with intrauterine pregnancy and healthy fetus were included. Patients with multiple gestation, positive screening for congenital malformation, including heart disease, and under 18 years of age were excluded. Doppler velocimetry ultrasonography of the ductus venosus was performed between the 11th and 14th weeks, 20th and 24th weeks, and 28th and 32nd weeks of gestation, and then the sound signal was extracted and segmented from the videos. To compare the means between the gestational trimesters of the approximate entropy (ApEn) and Lempel-Ziv complexity (CLZ) of the time between ventricular systoles, the Friedman test was used, with a significance level of 5%. No statistically significant difference was found between the 1st, 2nd, and 3rd trimesters regarding the mean ApEn (P=0.281) and CLZ (P=0.595) of the time between ventricular systoles of the ductus venosus. Ductus venosus systolic time was not sensitive to differentiate fetal cardiovascular dynamics between gestational trimesters. This study pioneered the characterization of cardiovascular normality by nonlinear parameters of the fetal ductus venosus in all three trimesters.

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Section: Discussionmentioning

confidence: 99%

Characterization of the normal fetal circulatory system of the ductus venosus using sound complexity parameters

Souza,

Carvalho,

Souza

et al. 2023

Braz J Med Biol Res

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First trimester serum tests for Down's syndrome screening

Alldred

Takwoingi

Guo

et al. 2015

Cochrane Database of Systematic Reviews

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Tests involving two markers in combination with maternal age, specifically PAPP-A, free βhCG and maternal age are significantly better than those involving single markers with and without age. They detect seven out of 10 Down's affected pregnancies for a fixed 5% FPR. The addition of further markers (triple tests) has not been shown to be statistically superior; the studies included are small with limited power to detect a difference.The screening blood tests themselves have no adverse effects for the woman, over and above the risks of a routine blood test. However some women who have a 'high risk' screening test result, and are given amniocentesis or chorionic villus sampling (CVS) have a risk of miscarrying a baby unaffected by Down's. Parents will need to weigh up this risk when deciding whether or not to have an amniocentesis or CVS following a 'high risk' screening test result.

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First and second trimester serum tests with and without first trimester ultrasound tests for Down's syndrome screening

Alldred

Takwoingi

Guo

et al. 2017

Cochrane Database of Systematic Reviews

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Tests involving first trimester ultrasound with first and second trimester serum markers in combination with maternal age are significantly better than those without ultrasound, or those evaluating first trimester ultrasound in combination with second trimester serum markers, without first trimester serum markers. We cannot make recommendations about a specific strategy on the basis of the small number of studies available.

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Valor preditivo do resultado fetal da dopplervelocimetria de ducto venoso entre a 11ª e a 14ª semanas de gestação

Cited by 6 publications

References 14 publications

Characterization of the normal fetal circulatory system of the ductus venosus using sound complexity parameters

Characterization of the normal fetal circulatory system of the ductus venosus using sound complexity parameters

First trimester serum tests for Down's syndrome screening

First and second trimester serum tests with and without first trimester ultrasound tests for Down's syndrome screening

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