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Antepartum fetal heart rate variability and intervillous placental blood flow in association with smoking.

Abstract：

:Intervillous placental blood flow and indices of fetal heart rate variability were measured from seven healthy pregnant women in the last trimester of pregnancy, once before and twice after smoking one cigarette. A blood flow reduction was observed in seven, a rise in five, and no change in two measurements. When intervillous placental blood flow decreased both indices of variability decreased (p less than 0.001), and when it increased the short-term component of fetal heart rate variability increased more significantly (p less than 0.001) than did the long-term component (p less than 0.01). :Intervillous placental blood flow and indices of fetal heart rate variability were measured from 7 healthy pregnant women in the last trimester of pregnancy, once before and twice after smoking 1 cigarette. Mean age was 27.3 years. The mothers were lying in 15 degrees left lateral recumbent position during the experiment. In 7 measurements a blood flow reduction equal to or more than 10% was seen. In 6 cases it was induced by smoking. Intervillous placental blood flow decreased from 93 +or- 11 (SD) to 74 +or- 10 ml/minute/100 ml intervillous blood volume. In 5 measurements an intervillous blood flow rise equal to over 10% was observed. In these cases intervillous placental blood flow increased from 79 +or- 23 to 98 +or- 23 ml. No correlation was observed between the absolute values of intervillous placental blood flow and the means of fetal heart rate variability indices. The main finding was that differential index and interval index correlated significantly with both decreasing and increasing intervillous placental blood flows. This study supports the hypothesis that the decrease of differential index is due to fetal hypoxia, possibly mediated by intervillous placental blood flow decrease, and that the decrease of interval index is due to a direct narcotic effect.

journal_name

Am J Obstet Gynecol

journal_title

American journal of obstetrics and gynecology

authors

Rauramo I,Forss M,Kariniemi V,Lehtovirta P

doi

10.1016/0002-9378(83)90975-4

subject

Has Abstract

pub_date

1983-08-15 00:00:00

pages

967-9

issue

8

eissn

0002-9378

issn

1097-6868

pii

0002-9378(83)90975-4

journal_volume

146

pub_type

杂志文章

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