Results 161 to 170 of about 29,383 (219)
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Obstetrics and Gynecology Clinics of North America, 2004
The introduction of new techniques for evaluating fetal status, particularly fetuses at theoretical risk for hypoxic ischemic encephalopathy, requires the most rigorous evaluation before widespread clinical deployment. The considerations extend beyond clinical value to the significant medicolegal implications of a failure to predict or ascertain ...
Laura, Detti +3 more
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The introduction of new techniques for evaluating fetal status, particularly fetuses at theoretical risk for hypoxic ischemic encephalopathy, requires the most rigorous evaluation before widespread clinical deployment. The considerations extend beyond clinical value to the significant medicolegal implications of a failure to predict or ascertain ...
Laura, Detti +3 more
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Doppler Velocimetry in Obstetrics
Obstetrics and Gynecology Clinics of North America, 1990Doppler ultrasound velocimetry offers a noninvasive method for assessing velocities in the various components of the fetal circulation including the cardiac, umbilical, cerebral, and aortic flows. As the volumetric flow measurement in these circumstances is prone to significant errors, the major approach has been to analyze the maximum frequency shift ...
D, Maulik, P, Yarlagadda, G, Downing
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Doppler velocimetry and placental disease
American Journal of Obstetrics and Gynecology, 1989Quantitative placental examinations were performed on 47 women who had Doppler flow velocity studies of the umbilical artery during their pregnancy. The systolic-diastolic ratio of the umbilical artery was used as the measurement parameter to divide the study population into two groups.
L A, Bracero +5 more
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Introduction to Doppler Velocimetry in Obstetrics
Obstetrics and Gynecology Clinics of North America, 1991Doppler velocimetry of the fetal and maternal circulation can provide important diagnostic and prognostic information. However, the precise role of this technology in screening, diagnosis, and management of perinatal complications is still evolving. This article discusses some principles of physics, techniques, clinical applications, and limitations of
S, Rotmensch, J A, Copel, J C, Hobbins
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Screening with Doppler velocimetry in labor
American Journal of Obstetrics and Gynecology, 1989Doppler flow velocimetry was performed on 273 nonselected patients in labor. All patients were at least 2 cm dilated and 80% effaced (58% greater than 4 cm) and were delivered of infants within 24 hours. Fetal heart rate tracing performed at the same time was read by another observer and compared with Doppler flow velocity measurements (systolic ...
L, Feinkind +4 more
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Doppler velocimetry in pregnancy
Seminars in Ultrasound, CT and MRI, 1993Since the late 1970s, Doppler velocimetry has been investigated extensively for use in obstetrics. Initially, this technique showed promise for the management of certain complications of pregnancy; this promise has yet to be fulfilled. Doppler velocimetry of either the uterine or umbilical vessels, which showed some merit in selecting growth-retarded ...
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Doppler Velocimetry in Prolonged Pregnancy
Obstetrics & Gynecology, 1991Eighty-two patients at 287 days' gestation or longer were tested by nonstress test (NST), amnioscopy, ultrasound assessment of amniotic fluid volume, and Doppler velocimetry. Several maternal and fetal arteries were analyzed: uterine, umbilical, descending thoracic aorta, renal, and middle cerebral.
Battaglia C +4 more
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Doppler Velocimetry in Cavitating Media
ASAIO Journal, 1997A numerical model has been developed to simulate propagation of ultrasonic beams in inhomogeneous moving media. The model is based on the ray theory of propagating waves, valid in the limit of high frequencies. The resulting equations depend only on local values of the velocity field and the speed of sound. In its implementation, the model assumes that
M Z, Pindera +2 more
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Doppler velocimetry in twin pregnancy
European Journal of Obstetrics & Gynecology and Reproductive Biology, 1992The flow velocity waveform profile in the umbilical artery was measured in 50 pairs of twins during the last week before birth. A significant association was found between high resistance indicies and occurrence of late fetal heart rate decelerations; the higher the resistance, the more frequent the decelerations.
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