The uterine and maternal placental blood flow during hyperoxia

Karlson, Karl E.; Kjellmer, I

doi:10.1515/jpme.1974.2.3.170

Cited by 8 publications

(7 citation statements)

References 11 publications

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“…In this connection it is worthwhile to mention that there were no changes of the RI caused by hyperoxygenation on both sides of the placenta, in the uterine arcuate arteries, as well as in the umbilical arteries in the three groups examined: AGA and SGA prepartal and AGA in labor. As NI-COLAIDES et al [15] we could not substantiate claims [10,16,17] of considerable vascular contrictions in the umbilical cord and the placenta during perfusion experiments when the oxygen content was elevated. Also in the common carotid artery the flow levels remained unchanged in our experiments.…”

Section: Discussionmentioning

confidence: 58%

“…On the one hand, positive effects cannot always be documented unequivocally because of various other therapeutic measurements adopted at the same time [13]; on the other hand, possible reactive hypoventilation can cause an increase in fetal acidity [21]. It is ascerted that increased oxygen content in the circulation can cause a vaso-constrictive effect in the umbilical cord and blood vessels of the placenta [10,16,17].…”

Section: Introductionmentioning

confidence: 99%

“…AGA in labor:10 normal fetuses examined during labor with an average length of pregnancy of 38/5 weeks. 1991 by Walter de Gruyter & Co. Berlin · New York Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 6/9/15 7:53 AM…”

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confidence: 99%

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The effect of maternal oxygen administration on fetal and maternal blood flow values using Doppler ultrasonography

Meyenburg¹,

Bartnicki²,

Saling³

1991

Jpme

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Thirty-one pregnant women divided into three groups (AGA prepartum, SGA prepartum without distress, AGA in labor) were examined using Doppler ultrasonography before, during and after oxygen administration to mothers via a face mask. The aim of the study was to find out if there was any effect on the blood flow values in the fetal aorta, the umbilical artery, the fetal common carotid artery and the uterine arcuate arteries. The resistance index (RI) did not change in those vessels during maternal hyperoxygenation with one exception: in the group of SGA fetuses the RI in the fetal aorta increased significantly. Blood flow velocity and volume blood flow remained unchanged in the fetal aorta during oxygen administration.

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Section: Discussionmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

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The effect of maternal oxygen administration on fetal and maternal blood flow values using Doppler ultrasonography

Meyenburg¹,

Bartnicki²,

Saling³

1991

Jpme

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“…The regimen used in this study, designed to maintain maternal PO2 below 300 Torr, might be ade quate in the treatment of fetal hypoxemia. Only fetuses with low S p 02 had normal or near normal Sp02 after the oxygen treatment, while no changes were observed in the fetal SpO: in these fetuses with sufficient Sp02, thus min imizing possible oxygen toxicity [26]. Although the present result was consistent with previous studies that suggest a beneficial effect of maternal oxygen administra tion on fetus [24,25], recent study has indicated that pro longed oxygen administration (> 10 min) by face mask at 10 liters/min to intrapartum women with normal second stage of labor worsened cord blood gas values [27], 13 women with normal fetal SpCL (>60%) examined in this study did not show deterioration of fetal SpCF determined 3-5 min after the initiation of oxygen administration (ta ble 4).…”

Section: Discussionmentioning

confidence: 92%

“…This mag nitude of increase in oxygen tension did not cause CO2 accumulation in the maternal blood suggesting that there was no suppressive effect at this level of PO: on maternal ventilatory activity. In an animal study, an extremely high maternal PCL, exceeding 400 Torr, may impair fetal cir culation [26]. The regimen used in this study, designed to maintain maternal PO2 below 300 Torr, might be ade quate in the treatment of fetal hypoxemia.…”

Section: Discussionmentioning

confidence: 98%

Fetal Heart Rate Decelerations Precede a Decrease in Fetal Oxygen Content

Izumi

Minakami²,

Sato³

1997

Gynecol Obstet Invest

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To determine the relationship between abnormal fetal heart rate (FHR) patterns, fetal oxygen content by reflectance pulse oximetry, and the effects of maternal oxygen administration, 158 intrapartum women consisting of 120 women with normal FHR patterns, and 38 women with varying degrees of variable FHR decelerations were examined. A new reflectance pulse oximetry probe was attached to the fetal forehead to continuously monitor fetal oxygen saturation (SpO₂) during labor. Oxygen was administered for 30 min at 5 liters/min by nasal canula in 32 women. No significant change in fetal SpO₂ was seen in women with normal FHR patterns, but a significant decline in SpO₂ was observed shortly before births. FHR decelerations less than 90 bpm occurred prior to the decline in fetal SpO₂ Maternal oxygen administration was effective in increasing fetal SpO₂ in fetuses with decreased SpO₂ (SpO₂ < 50%), but not in fetuses with high SpO₂ (SpO₂ > 60%). It is concluded that fetal SpO₂ exhibits no change during normal labor but significantly declines shortly before birth, that relatively severe variable decelerations (< 90 bpm) can decrease fetal SpO₂, and that maternal oxygen treatment at 5 liters/min is effective in augmenting fetal oxygen tension in fetuses with decreased oxygen tension.