Ductus venosus blood flow velocity waveforms in the human fetus—A doppler study

Huisman, Tjeerd W.A.; Stewart, Patricia A.; Wladimiroff, J. W.

doi:10.1016/0301-5629(92)90005-u

Cited by 94 publications

(58 citation statements)

References 10 publications

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“…redução acentuada na pós-carga 16 . Estas alterações fisiológicas justificariam os valores mais elevados, relacionados com a idade gestacional, encontrados nas velocidades de fluxo no DV no final do segundo e durante o terceiro trimestre [17][18][19] . Montenegro et al 20 encontraram valores médios para velocidade na onda S na 10ª semana de 23,3 cm/s, na 11ª semana de 24,5 cm/s, na 12ª semana de 25,1 cm/s e na 13 a semana de 23,8 cm/s.…”

Section: Pacientes E Métodosunclassified

Valores dos parâmetros da dopplerfluxometria do ducto venoso entre a 10ª e a 14ª semana de gestações normais

Carvalho¹,

Moron²,

Mattar³

et al. 2004

Rev. Bras. Ginecol. Obstet.

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IntroduçãoÉ aceito que a velocidade sanguínea no ducto venoso (DV) pode refletir alterações na hemodinâ-mica venosa central ou no retorno venoso umbilical. Existe estreita correlação entre a velocidade e a pressão no fluxo sangüíneo . A avaliação da mecânica do fluxo neste vaso apresenta, portanto, informações vitais sobre a distribuição do sangue umbilical oxigenado no feto e pode oferecer novas possibilidades de aplicação como método diagnóstico na compreensão da hemodinâmica fetal.Fetos com restrição ao crescimento apresentam fluxo sanguíneo venoso umbilical diminuído e volume de sangue reduzido a ser distribuído no fí-gado e DV 1 . Durante hipoxemia, a proporção de sangue umbilical direcionado ao DV aumenta e mantém um fluxo preferencial através do forame oval 2,3 . Outra possível causa de modificação na velocidade de fluxo no DV é falência cardíaca devido a malformações estruturais ou alterações funcio-

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Section: Pacientes E Métodosunclassified

Valores dos parâmetros da dopplerfluxometria do ducto venoso entre a 10ª e a 14ª semana de gestações normais

Carvalho¹,

Moron²,

Mattar³

et al. 2004

Rev. Bras. Ginecol. Obstet.

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“…8a, b). The most frequently used indices are the ratio between the velocities of the systolic and diastolic peaks [38] and by the ratio between the systolic peak and the minimum velocity that can be observed during the atrial contraction (systolic/atrial ratio) [39]. The velocity of the blood in the ductus venosus increases with the increase in gestational age and, consequently, the value of these indices decreases.…”

Section: Cardiac and Venous Dopplermentioning

confidence: 99%

Intrauterine Growth Retardation and Fetal Cardiac Function

Severi¹,

Rizzo

Bocchi³

et al. 2000

Fetal Diagn Ther

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Intrauterine growth retardation is a pathology which is found in 3–10% of all pregnancies and it is associated with around 20–25% of all fetal intrauterine deaths and with long-term neurologic sequelae. It presents an increased risk of distress during labor and delivery and a greater risk of perinatal mortality. The causes of IUGR and the cardiac and venous Doppler in normal fetuses are analyzed, and the hemodynamic cardiac modifications in IUGR fetus are discussed. The fetal cardiac function in intrauterine growth retardation shows a redistribution of the fetal cardiac output, which tends to favor the left ventricle as the mechanism to compensate for the uteroplacental insufficiency. The Doppler velocity indices are modified as the fetal condition progressively deteriorates and they represent an important tool for the management of the complicated pregnancy.

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“…The well-oxygenated blood from the ductus venosus passes through the foramen ovale into the left atrium to supply the arteries leading to the brain directly. The rest of the blood from the umbilical vein passes through the left portal vein into the left lobe of the liver [1][2][3] . In the case of an abnormal course of the umbilical vein, there are three possible umbilico-systemic connections: a direct inflow into the right atrium, a direct connection with the infrahepatic part of the inferior vena cava (these two bypass the portal system) and a direct connection with the vena porta system (in this latter case the whole blood mass coming through the umbilical vein has to pass the portal system) [4][5][6][7] .…”

Section: Discussionmentioning

confidence: 99%

Prenatal Diagnosis of Abnormal Course of Umbilical Vein and Absent Ductus Venosus – Report of Three Cases

et al. 2007

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An abnormal course of the umbilical vein is a rare anomaly. Its association with the congenital absence of the ductus venosus is common. We found 3 cases of an abnormal course of the umbilical vein and an absent ductus venosus. In 2 of these cases, the umbilical vein turned down and continued in the internal iliac vein, and no ductus venosus was found. One of these pregnancies was terminated. From the continued pregnancy a growth-retarded baby was born. At follow-up examinations, mild microcephaly, mildly elevated levels of ammonia, delayed speech and mild muscular hypotonia were found. In the third case, the umbilical vein turned up from the level of umbilical ring and the anterior of the liver above the diaphragma and connected directly into the right atrium. Associated complex congenital heart malformations – transposition of the great arteries, and ventricular septal defect – were diagnosed prenatally. In the umbilical vein from the placenta to the umbilical ring, the flow was low velocity continuous; from the umbilical ring to the right atrium, the flow was biphasic high velocity (90 cm/s). Such an elevated blood flow could be a sign of increased cardiac preload. The long-term neurological follow-up of babies with prenatally diagnosed venous malformations is necessary.

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Ductus venosus blood flow velocity waveforms in the human fetus—A doppler study

Cited by 94 publications

References 10 publications

Valores dos parâmetros da dopplerfluxometria do ducto venoso entre a 10ª e a 14ª semana de gestações normais

Valores dos parâmetros da dopplerfluxometria do ducto venoso entre a 10ª e a 14ª semana de gestações normais

Intrauterine Growth Retardation and Fetal Cardiac Function

Prenatal Diagnosis of Abnormal Course of Umbilical Vein and Absent Ductus Venosus – Report of Three Cases

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