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Postnatal changes of cerebral blood flow velocity were studied in 43 healthy term
neonates using a continuous waveform bidirectional Doppler flowmeter and an ultrasonograph
with a pulsed Doppler unit.
Pulsatility Index (PI) values of anterior cerebral artery were high within 6 hours
after birth, and then decreased in the neonates born by means of both vaginal delivery
and caesarean section. These postnatal changes of PI observed with the continuous
waveform bidirectional Doppler flowmeter were identical with those with pulsed Doppler
technique.
The sequential measurement of right radial artery blood flow showed a marked decrease
of diastolic flow velocity, which may be due to transient postnatal patent ductus
arteriosus. Therefore, this postnatal transient patent ductus arteriosus may be one
of the pathogenetic factors for high PI values shortly after birth.
Key words
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Article info
Publication history
Accepted:
November 8,
1983
Received:
July 14,
1983
Identification
Copyright
© 1983 Published by Elsevier Inc.
