Biomaterial Database

Fetal blood velocities in Rh isoimmunization: relationship to gestational age and to fetal hematocrit. 1986

D A Rightmire, and K H Nicolaides, and C H Rodeck, and S Campbell

Doppler blood cell velocities were measured in the aortas, inferior vena cavas, and umbilical veins of fetuses from isoimmunized pregnancies and related to the hematocrit levels of the fetal blood determined at fetoscopy. Pourcelot Index of flow in the umbilical artery was similarly studied. The mean velocities in the descending aortas and the Pourcelot Indexes of the umbilical arteries of both normal and affected fetuses correlated with fetal age. These velocities and indexes of affected fetuses also correlated inversely with the fetal hematocrit levels independently of the correlation with fetal age. The affected fetuses had higher mean velocities in the aorta and in the inferior vena cava than did normal fetuses. A simple model of multiple regression predicted the fetal hematocrit levels with a mean error of 3.8 hematocrit units (volume %).

UI	MeSH Term	Description	Entries
D008954	Models, Biological	Theoretical representations that simulate the behavior or activity of biological processes or diseases. For disease models in living animals, DISEASE MODELS, ANIMAL is available. Biological models include the use of mathematical equations, computers, and other electronic equipment.	Biological Model,Biological Models,Model, Biological,Models, Biologic,Biologic Model,Biologic Models,Model, Biologic
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
D012044	Regression Analysis	Procedures for finding the mathematical function which best describes the relationship between a dependent variable and one or more independent variables. In linear regression (see LINEAR MODELS) the relationship is constrained to be a straight line and LEAST-SQUARES ANALYSIS is used to determine the best fit. In logistic regression (see LOGISTIC MODELS) the dependent variable is qualitative rather than continuously variable and LIKELIHOOD FUNCTIONS are used to find the best relationship. In multiple regression, the dependent variable is considered to depend on more than a single independent variable.	Regression Diagnostics,Statistical Regression,Analysis, Regression,Analyses, Regression,Diagnostics, Regression,Regression Analyses,Regression, Statistical,Regressions, Statistical,Statistical Regressions
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
D005312	Fetal Blood	Blood of the fetus. Exchange of nutrients and waste between the fetal and maternal blood occurs via the PLACENTA. The cord blood is blood contained in the umbilical vessels (UMBILICAL CORD) at the time of delivery.	Cord Blood,Umbilical Cord Blood,Blood, Cord,Blood, Fetal,Blood, Umbilical Cord,Bloods, Cord,Bloods, Fetal,Bloods, Umbilical Cord,Cord Blood, Umbilical,Cord Bloods,Cord Bloods, Umbilical,Fetal Bloods,Umbilical Cord Bloods
D005332	Fetoscopy	Endoscopic examination, therapy or surgery of the fetus and amniotic cavity through abdominal or uterine entry.	Amnioscopic Surgical Procedures,Amnioscopy,Embryoscopic Surgical Procedures,Embryoscopy,Fetoscopic Surgical Procedures,Surgical Procedures, Amnioscopic,Surgical Procedures, Embryoscopic,Surgical Procedures, Fetoscopic,Amnioscopic Surgery,Embryoscopic Surgery,Fetoscopic Surgery,Surgery, Amnioscopic,Surgery, Embryoscopic,Surgery, Fetoscopic,Amnioscopic Surgeries,Amnioscopic Surgical Procedure,Amnioscopies,Embryoscopic Surgeries,Embryoscopic Surgical Procedure,Embryoscopies,Fetoscopic Surgeries,Fetoscopic Surgical Procedure,Fetoscopies,Procedure, Amnioscopic Surgical,Procedure, Embryoscopic Surgical,Procedure, Fetoscopic Surgical,Procedures, Amnioscopic Surgical,Procedures, Embryoscopic Surgical,Procedures, Fetoscopic Surgical,Surgeries, Amnioscopic,Surgeries, Embryoscopic,Surgeries, Fetoscopic,Surgical Procedure, Amnioscopic,Surgical Procedure, Embryoscopic,Surgical Procedure, Fetoscopic
D005865	Gestational Age	The age of the conceptus, beginning from the time of FERTILIZATION. In clinical obstetrics, the gestational age is often estimated from the onset of the last MENSTRUATION which is about 2 weeks before OVULATION and fertilization. It is also estimated to begin from fertilization, estrus, coitus, or artificial insemination.	Embryologic Age,Fetal Maturity, Chronologic,Chronologic Fetal Maturity,Fetal Age,Maturity, Chronologic Fetal,Age, Embryologic,Age, Fetal,Age, Gestational,Ages, Embryologic,Ages, Fetal,Ages, Gestational,Embryologic Ages,Fetal Ages,Gestational Ages
D006400	Hematocrit	The volume of packed RED BLOOD CELLS in a blood specimen. The volume is measured by centrifugation in a tube with graduated markings, or with automated blood cell counters. It is an indicator of erythrocyte status in disease. For example, ANEMIA shows a low value; POLYCYTHEMIA, a high value.	Erythrocyte Volume, Packed,Packed Red-Cell Volume,Erythrocyte Volumes, Packed,Hematocrits,Packed Erythrocyte Volume,Packed Erythrocyte Volumes,Packed Red Cell Volume,Packed Red-Cell Volumes,Red-Cell Volume, Packed,Red-Cell Volumes, Packed,Volume, Packed Erythrocyte,Volume, Packed Red-Cell,Volumes, Packed Erythrocyte,Volumes, Packed Red-Cell
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man