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F61The ductus venosus blood flow velocity waveforms during labour in 42 singleton fetuses at term
Author(s) -
Denzel S. A.,
Krapp M.,
Germer U.,
Gembruch U.
Publication year - 2000
Publication title -
ultrasound in obstetrics and gynecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.202
H-Index - 141
eISSN - 1469-0705
pISSN - 0960-7692
DOI - 10.1046/j.1469-0705.2000.00015-1-61.x
Subject(s) - ductus venosus , medicine , blood flow , laser doppler velocimetry , fetus , velocimetry , cardiology , contraction (grammar) , pregnancy , physics , genetics , optics , biology
Background The aim of this study was to learn about the physiological changes in the ductus venosus blood flow velocity waveforms during labour. Method Ductus venosus flow curves were obtained by Doppler ultrasonography during and in‐between uterine contraction during the first and second stage of labour in 42 singleton fetuses at term. In every patient we tried to measure at four different times of dilatation of the cervix (0–2 cm, 2–4 cm, 6–8 cm, fully dilated). In average we obtained 3.76 measurement periods. At every period the ductus was continuously recorded on video tape throughout 5–10 min. Results Changes in the ductus venosus blood flow were observed during labour. The flow profiles did not change with increasing cervix dilatation, but they changed during contraction compared to in absence of contractions. The peak velocity index (PVIV) and the pulsatility index for veins (PIV) within uterine contraction differed significantly ( P < 0.001) compared to pviv and piv in absence of contractions in all four stages of cervix dilatation. Conclusions The ductus venosus blood flow velocity waveforms undergo great changes intrapartum in cases of uneventful pregnancy and delivery. It has to be further evaluated which subgroup of pregnancies will benefit from Doppler velocimetry of the ductus venosus for intrapartum surveillance.