Acute hypoxemia does not affect the umbilical artery flow velocity waveform in fetal sheep.
Obstet Gynecol
; 75(4): 590-3, 1990 Apr.
Article
em En
| MEDLINE
| ID: mdl-2314776
ABSTRACT
The present study in sheep was undertaken to test whether acute fetal hypoxemia causes abnormalities in the umbilical artery velocity waveform. A 1-hour period of hypoxemia was induced in six chronically catheterized fetal sheep by reducing the inspired oxygen content of the ewe. During hypoxemia, the ratio of the systolic to diastolic velocity did not change significantly compared with controls. From this experimental evidence, we conclude that normal Doppler waveforms in the umbilical artery do not necessarily imply fetal normoxemia in sheep and that, because a direct cause-effect relationship has not been established, fetuses that have abnormal waveforms are not necessarily hypoxemic. Whether this is also true in humans remains to be shown.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Artérias Umbilicais
/
Doenças Fetais
/
Hipóxia
Limite:
Animals
/
Pregnancy
Idioma:
En
Revista:
Obstet Gynecol
Ano de publicação:
1990
Tipo de documento:
Article
País de afiliação:
Canadá