Fetal venous circulation - an update on hemodynamics

Kiserud, Torvid

doi:10.1515/jpm.2000.011

Cited by 56 publications

(40 citation statements)

References 36 publications

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“…The high peak velocity in the DV, comparable with arterial velocities, probably gives the blood sufficient momentum to reach the foramen ovale without extensive mixing with deoxygenated blood [18,19]. Velocimetry of the DV carries new diagnostic possibilities to evaluate preload or cardiac function.…”

Section: Discussionmentioning

confidence: 99%

“…This may reflect a wide range of geometrical normal variation. Squeezing of the DV outlet or the inferior vena cava at the level of the diaphragm will cause an increased wave reflection with less or no pulse wave transmitted into the DV resulting in non-pulsatile velocity recording at the isthmus [19]. …”

Section: Discussionmentioning

confidence: 99%

“…The strengths of this study are: (1) the adequate sample size for each gestational week, and (2) that we also included fetuses in the early second trimester [14,15,16,17,18,19,20], unlike most other studies. Moreover, interobserver variations of the measurement are acceptable.…”

Section: Discussionmentioning

confidence: 99%

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Normal Reference Ranges of Ductus Venosus Doppler Indices in the Period from 14 to 40 Weeks’ Gestation

Tongprasert

Srisupundit

Luewan

et al. 2011

Gynecol Obstet Invest

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Objective: To construct reference ranges of ductus venosus (DV) Doppler indices in normal singleton pregnancies. Methods: A cross-sectional study was conducted on low-risk singleton pregnancies with accurate gestational age, and normal fetuses were enrolled into the study. Measurements of DV Doppler indices were determined by experienced sonographers. Poor quality images were excluded. Results: A total of 640 fetuses underwent DV measurements, ranging from 13 to 30 for each gestational week. The relationship between gestational age and DV Doppler indices was not linear. The best-fit regression equations are as follows: preload index = (5.061 – 0.4882) × exp (–0.211 × GA) + 0.4882; peak velocity index for veins = (7.498 – 0.5609) × exp (–0.2184 × GA) + 0.5609; pulsatility index for veins = (17.9 – 0.6053) × exp (–0.2512 × GA) + 0.6053; systolic/atrial wave ratio = (300 – 2.124) × exp (–0.3649 × GA) + 2.124. Notably, during the period from 14 to 20 weeks’ gestation, all of the four indices rapidly decreased and they were relatively stable or slightly decreased after that. The nomogram tables for various percentile ranges were constructed. Conclusion: A nomogram for DV Doppler indices for each gestational week during the period from 14 to 40 weeks’ gestation was established. These reference ranges may be a useful non-invasive tool for evaluation of fetal cardiac function.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Normal Reference Ranges of Ductus Venosus Doppler Indices in the Period from 14 to 40 Weeks’ Gestation

Tongprasert

Srisupundit

Luewan

et al. 2011

Gynecol Obstet Invest

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“…Foramen ovale bypasses blood from the right atrium directly into the left atrium. In the human fetus, the venous hemodynamics privileges the flow from the ductus venosus over the flow from the inferior vena cava in passing through the foramen ovale [47, 48]. The strong blood flow with a velocity up to 85 cm/s distends the valve of the foramen ovale and forces the blood into the left atrium [48].…”

Section: Embryology and Epidemiology Of Pfomentioning

confidence: 99%

“…In the human fetus, the venous hemodynamics privileges the flow from the ductus venosus over the flow from the inferior vena cava in passing through the foramen ovale [47, 48]. The strong blood flow with a velocity up to 85 cm/s distends the valve of the foramen ovale and forces the blood into the left atrium [48]. The volume of blood that crosses the foramen ovale equals 34% of the cardiac output at 20 weeks, and 18% at 30 weeks of pregnancy [49].…”

Section: Embryology and Epidemiology Of Pfomentioning

confidence: 99%

Migraine and Patent Foramen Ovale: A Residual Coincidence or a Pathophysiological Intrigue?

2006

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Migraine is one of the most common neurological disorders and one of the most frequent primary headaches. It imposes a significant burden on the affected individuals, society and health care system. As the etiology and pathophysiology of migraine are not well understood, treatment is largely symptomatic. Patent foramen ovale is a remnant of a fetal circulation and is highly prevalent in the general population. Its presence was linked to several disorders including migraine. The aim of this review was to search in the available data the answer to the question whether the link between migraine and patent foramen ovale is coincidental or whether they represent a pathophysiological entity.

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Fetal Responses to Hypoxia

Kasdaglis

Baschat

2012

Anesthesia and the Fetus

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Fetal venous circulation - an update on hemodynamics

Cited by 56 publications

References 36 publications

Normal Reference Ranges of Ductus Venosus Doppler Indices in the Period from 14 to 40 Weeks’ Gestation

Normal Reference Ranges of Ductus Venosus Doppler Indices in the Period from 14 to 40 Weeks’ Gestation

Migraine and Patent Foramen Ovale: A Residual Coincidence or a Pathophysiological Intrigue?

Fetal Responses to Hypoxia

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