Biomaterial Database

[Studies on fetal middle cerebral artery blood flow velocity waveforms in the intrapartum period]. 1992

N Ueno

Department of Obstetrics and Gynecology, Kitasato University School of Medicine, Kanagawa.

The effects of uterine contractions on fetal intracranial circulation were studied by means of two dimensional color doppler flow equipment. The Resistance Index of the Middle Cerebral Artery (MCA-RI) was evaluated and the following results were obtained. 1) The MCA-RI value during uterine contraction was significantly higher than that obtained between contractions and the highest MCA-RI value was noted during the active phase, which may mean that the descending fetal head was subjected to the strongest compression at this time. 2) A significant positive correlation was found between intrauterine pressure and the MCA-RI value at any time during labor the course of labor. 3) A significant negative correlation was noted between MCA-RI and FHR. FHR early deceleration (ED) appeared in 67% of the cases with absent end-diastolic flow velocity (AEFV), and in 100% of cases with reverse EFV. It was thus shown that intracranial hemodynamics changed dramatically in the intrapartum period even in the normal fetus.

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
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
D002536	Cerebral Arteries	The arterial blood vessels supplying the CEREBRUM.	Arteries, Cerebral,Artery, Cerebral,Cerebral Artery
D005260	Female		Females
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
D014590	Uterine Contraction	Contraction of the UTERINE MUSCLE.	Myometrial Contraction,Contraction, Myometrial,Contraction, Uterine,Contractions, Myometrial,Contractions, Uterine,Myometrial Contractions,Uterine Contractions
D014655	Vascular Resistance	The force that opposes the flow of BLOOD through a vascular bed. It is equal to the difference in BLOOD PRESSURE across the vascular bed divided by the CARDIAC OUTPUT.	Peripheral Resistance,Total Peripheral Resistance,Pulmonary Vascular Resistance,Systemic Vascular Resistance,Peripheral Resistance, Total,Resistance, Peripheral,Resistance, Pulmonary Vascular,Resistance, Systemic Vascular,Resistance, Total Peripheral,Resistance, Vascular,Vascular Resistance, Pulmonary,Vascular Resistance, Systemic