Biomaterial Database

[Fetal hemodynamics evaluated by pulsed Doppler echocardiography]. 1985

M Takahashi, and H Shimada, and H Yanagisawa, and S Katagiri, and H Kobayashi

The hemodynamics of fetal hearts, possibly having right ventricular overload were investigated using pulsed Doppler and cross-sectional echocardiography. The subjects consisted of 250 normal fetuses at 30 to 38 weeks gestation, 23 of which were studied by Doppler method. The ultrasonic beam was directed toward the centers of the tricuspid and mitral orifices imaged in the apical four-chamber view to record right ventricular and left ventricular inflow velocities. The flow velocity patterns of right and left ventricular inflow tracts were similar and consisted of two peaks; the rapid filling phase and the atrial contraction phase. The peak velocity of the atrial contraction phase was slightly greater than that of the rapid filling phase. Mitral peak flow velocity was 52.1 +/- 9.9 cm/sec (mean +/- SD), while tricuspid peak flow velocity was 56.1 +/- 8.7 cm/sec, and the ratio of the latter to the former was 1.09 +/- 0.09. We calculated the excursions and diastolic descent rate (DDR) of the mitral and tricuspid valves using M-mode echocardiography, which were also strongly affected by stroke volume. TV DDR/MV DDR = 1.06 +/- 0.10, and TV excursion/MV excursion = 1.09 +/- 0.09. Reportedly, 2/3 of the total cardiac volume entered the right ventricle, based on the experimental study of fetal lambs. However, the results obtained in the present study suggest that the right ventricular flow volume may be only slightly greater than that of the left ventricle.

UI	MeSH Term	Description	Entries
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
D011296	Prenatal Diagnosis	Determination of the nature of a pathological condition or disease in the postimplantation EMBRYO; FETUS; or pregnant female before birth.	Diagnosis, Prenatal,Fetal Diagnosis,Fetal Imaging,Fetal Screening,Intrauterine Diagnosis,Antenatal Diagnosis,Antenatal Screening,Diagnosis, Antenatal,Diagnosis, Intrauterine,Prenatal Screening,Antenatal Diagnoses,Antenatal Screenings,Diagnosis, Fetal,Fetal Diagnoses,Fetal Imagings,Fetal Screenings,Imaging, Fetal,Intrauterine Diagnoses,Prenatal Diagnoses,Prenatal Screenings,Screening, Antenatal,Screening, Fetal,Screening, Prenatal
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
D002302	Cardiac Output	The volume of BLOOD passing through the HEART per unit of time. It is usually expressed as liters (volume) per minute so as not to be confused with STROKE VOLUME (volume per beat).	Cardiac Outputs,Output, Cardiac,Outputs, Cardiac
D004452	Echocardiography	Ultrasonic recording of the size, motion, and composition of the heart and surrounding tissues. The standard approach is transthoracic.	Echocardiography, Contrast,Echocardiography, Cross-Sectional,Echocardiography, M-Mode,Echocardiography, Transthoracic,Echocardiography, Two-Dimensional,Transthoracic Echocardiography,2-D Echocardiography,2D Echocardiography,Contrast Echocardiography,Cross-Sectional Echocardiography,Echocardiography, 2-D,Echocardiography, 2D,M-Mode Echocardiography,Two-Dimensional Echocardiography,2 D Echocardiography,Cross Sectional Echocardiography,Echocardiography, 2 D,Echocardiography, Cross Sectional,Echocardiography, M Mode,Echocardiography, Two Dimensional,M Mode Echocardiography,Two Dimensional Echocardiography
D005260	Female		Females
D005318	Fetal Heart	The heart of the fetus of any viviparous animal. It refers to the heart in the postembryonic period and is differentiated from the embryonic heart (HEART/embryology) only on the basis of time.	Fetal Hearts,Heart, Fetal,Hearts, Fetal
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
D006351	Heart Valves	Flaps of tissue that prevent regurgitation of BLOOD from the HEART VENTRICLES to the HEART ATRIA or from the PULMONARY ARTERIES or AORTA to the ventricles.	Cardiac Valves,Cardiac Valve,Heart Valve,Valve, Cardiac,Valve, Heart,Valves, Cardiac,Valves, Heart
D006439	Hemodynamics	The movement and the forces involved in the movement of the blood through the CARDIOVASCULAR SYSTEM.	Hemodynamic