Switch to
| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
2
|
| pubmed:dateCreated |
1992-6-30
|
| pubmed:abstractText |
In a prospective cross-sectional study, we examined 154 normal pregnant women and measured the systolic to diastolic (S/D) ratio and resistance index (RI) in the umbilical artery and both uterine arteries. Placental location with respect to laterality was determined by real-time ultrasound. In patients with unilateral placental location, each uterine artery was evaluated according to its relationship with the placenta. Doppler flow velocity waveforms were obtained by a continuous wave Doppler device. Kolmogorov D tests revealed that RI values follow gaussian distribution, but that S/D values were markedly skewed to the right. There was a significant negative linear relationship between gestational age and umbilical artery RI and a significant negative curvilinear relationship between gestational age and umbilical artery (S/D (r = 0.83, p less than 0.001; and r = -0.79, p less than 0.001, respectively). Confidence bands for umbilical artery RI were developed based on the linear model with gestational age (fitted umbilical artery RI = 0.97199 - 0.01045*gestational age). Confidence bands for umbilical artery S/D were derived from the corresponding RI values by means of the functional relationship S/D = 1/(1 - RI). The RI and S/D values of the uterine arteries declined until 24 to 25 weeks' gestation and remained unchanged thereafter. This relationship, however, was not statistically significant (r = -0.10, p = 0.22). The placental uterine artery is different from the nonplacental quantitatively and qualitatively.(ABSTRACT TRUNCATED AT 250 WORDS)
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:status |
MEDLINE
|
| pubmed:month |
Mar
|
| pubmed:issn |
0735-1631
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| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
9
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
94-101
|
| pubmed:dateRevised |
2004-11-17
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| pubmed:meshHeading |
pubmed-meshheading:1590875-Cross-Sectional Studies,
pubmed-meshheading:1590875-Diastole,
pubmed-meshheading:1590875-Female,
pubmed-meshheading:1590875-Gestational Age,
pubmed-meshheading:1590875-Humans,
pubmed-meshheading:1590875-Placenta,
pubmed-meshheading:1590875-Pregnancy,
pubmed-meshheading:1590875-Prospective Studies,
pubmed-meshheading:1590875-Reference Values,
pubmed-meshheading:1590875-Regression Analysis,
pubmed-meshheading:1590875-Systole,
pubmed-meshheading:1590875-Ultrasonography, Prenatal,
pubmed-meshheading:1590875-Umbilical Arteries,
pubmed-meshheading:1590875-Uterus,
pubmed-meshheading:1590875-Vascular Resistance
|
| pubmed:year |
1992
|
| pubmed:articleTitle |
Uteroplacental Doppler flow velocity waveform indices in normal pregnancy: a statistical exercise and the development of appropriate reference values.
|
| pubmed:affiliation |
Department of Obstetrics and Gynecology, Bowman Gray School of Medicine, Wake Forest University, Winston-Salem, North Carolina.
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| pubmed:publicationType |
Journal Article
|