Biomaterial Database

[Changes in arterial uterine blood flow velocity waveform during uterine contraction and relaxation in labor]. 1990

Y Takeuchi

Department of Obstetrics and Gynecology, Tottori University School of Medicine, Yonago.

The arterial uterine blood flow velocity waveform during uterine contraction and relaxation in labor was measured with ultrasonic continuous wave (CW) Doppler device in 44 pregnant women at 37-41 weeks of gestation. The fetal heart rate (FHR) was also recorded by cardiotocogram during labor in every case. 1. Both the resistance index (RI) and pulsatility index (PI) of the arterial uterine blood flow velocity waveform were significantly higher during uterine contraction than during relaxation (p less than 0.005). These increases in RI and PI during contraction were not influenced by the maternal heart rate. The reverse or interrupted end-diastolic flow was demonstrated in 16.3% of the cases. 2. No abnormal FHR patterns were observed in any of the cases except two with early deceleration or mild variable deceleration in which uterine arterial end-diastolic flow was maintained. The fetal conditions did not seem to be influenced by the reduction of arterial uterine blood flow in our study.

UI	MeSH Term	Description	Entries
D007743	Labor, Obstetric	The repetitive uterine contraction during childbirth which is associated with the progressive dilation of the uterine cervix (CERVIX UTERI). Successful labor results in the expulsion of the FETUS and PLACENTA. Obstetric labor can be spontaneous or induced (LABOR, INDUCED).	Obstetric Labor
D007749	Labor Stage, Third	The final period of OBSTETRIC LABOR that is from the expulsion of the FETUS to the expulsion of the PLACENTA.	Labor, Third Stage,Labor Stages, Third,Stage, Third Labor,Stages, Third Labor,Third Labor Stage,Third Labor Stages,Third Stage Labor
D011247	Pregnancy	The status during which female mammals carry their developing young (EMBRYOS or FETUSES) in utero before birth, beginning from FERTILIZATION to BIRTH.	Gestation,Pregnancies
D001783	Blood Flow Velocity	A value equal to the total volume flow divided by the cross-sectional area of the vascular bed.	Blood Flow Velocities,Flow Velocities, Blood,Flow Velocity, Blood,Velocities, Blood Flow,Velocity, Blood Flow
D005260	Female		Females
D005323	Fetal Monitoring	Physiologic or biochemical monitoring of the fetus. It is usually done during LABOR, OBSTETRIC and may be performed in conjunction with the monitoring of uterine activity. It may also be performed prenatally as when the mother is undergoing surgery.	Monitoring, Fetal,Fetal Monitorings,Monitorings, Fetal
D006340	Heart Rate, Fetal	The heart rate of the FETUS. The normal range at term is between 120 and 160 beats per minute.	Fetal Heart Rate,Fetal Heart Rates,Heart Rates, Fetal,Rate, Fetal Heart,Rates, Fetal Heart
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D014463	Ultrasonography	The visualization of deep structures of the body by recording the reflections or echoes of ultrasonic pulses directed into the tissues. Use of ultrasound for imaging or diagnostic purposes employs frequencies ranging from 1.6 to 10 megahertz.	Echography,Echotomography,Echotomography, Computer,Sonography, Medical,Tomography, Ultrasonic,Ultrasonic Diagnosis,Ultrasonic Imaging,Ultrasonographic Imaging,Computer Echotomography,Diagnosis, Ultrasonic,Diagnostic Ultrasound,Ultrasonic Tomography,Ultrasound Imaging,Diagnoses, Ultrasonic,Diagnostic Ultrasounds,Imaging, Ultrasonic,Imaging, Ultrasonographic,Imaging, Ultrasound,Imagings, Ultrasonographic,Imagings, Ultrasound,Medical Sonography,Ultrasonic Diagnoses,Ultrasonographic Imagings,Ultrasound, Diagnostic,Ultrasounds, Diagnostic
D014590	Uterine Contraction	Contraction of the UTERINE MUSCLE.	Myometrial Contraction,Contraction, Myometrial,Contraction, Uterine,Contractions, Myometrial,Contractions, Uterine,Myometrial Contractions,Uterine Contractions