Results 291 to 300 of about 319,669 (345)

Effects of blood donation on cerebral blood flow velocity

Transfusion, 1990
Eighteen healthy male blood donors, nine with hematocrit (Hct) of 0.40 to 0.45 (normal Hct) and nine with Hct of 0.49 to 0.52 (upper‐limit Hct), were monitored by continuous‐wave internal carotid Doppler sonography and hematologic tests for 28 days after blood donation, to ascertain whether and to what extent a single standard donation may modify the ...
C, Silvani, A, Zanella, F, Rossi, G, Cabrini, C, Ferrari, B, Cesana, G, Sirchia   +6 more
openaire   +2 more sources

Decorrelation-based blood flow velocity estimation: effect of spread of flow velocity, linear flow velocity gradients, and parabolic flow

IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control, 2002
In recent years, a new method to measure transverse blood flow, based on the decorrelation of the radio frequency (RF) signals has been developed. In this paper, we investigated the influence of nonuniform flow on the velocity estimation. The decorrelation characteristics of transverse blood flow using an intravascular ultrasound (IVUS) array catheter ...
Lupotti, F.A., Steen, A.F.W. van der, Mastik, F., Korte, C.L. de   +3 more
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Blood flow velocity in pulmonary microvessels of bullfrog

Respiration Physiology, 1979
Flow velocity in the pulmonary microvessels of the exposed lung of bullfrogs was measured by means of a laser Doppler microscope of an oblique backward mode, together with a signal-analyzing system having a time sharing circuit triggered by the R-wave of the ECG.
M, Horimoto, T, Koyama, H, Mishina, T, Asakura, M, Murao   +4 more
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Effect of Adenosine on Cerebral Blood Flow Velocity

Journal of Neuroimaging, 2001
ABSTRACTBackground and Purpose. Evidence suggests that adenosine (ADN) is a potent vasodilator of cerebral vessels. However, the feasibility of manipulating human cerebral vascular resistance with AND has not been assessed by means of TCD. The purpose of this study was to quantitatively estimate the change in middle cerebral artery cerebral blood flow ...
C, Zanferrari, A Y, Razumovsky, P M, Lavados, S, Sen, S M, Oppenheimer   +4 more
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Blood flow velocities in human intraplacental arteries

Acta Obstetricia et Gynecologica Scandinavica, 1994
Objective. To characterise the physiological findings of blood circulation in intraplacental arteries in normal and complicated pregnancies.Design. A descriptive cross‐sectional study. Umbilical and intraplacental artery resistance index (RI) Doppler recordings during the last trimester of pregnancy.Subjects.
P, Kirkinen, J, Kurmanavichius, A, Huch, R, Huch   +3 more
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Effect of Pentoxifylline on Microvascular Blood Flow Velocity

Angiology, 1981
Pentoxifylline (PF), known to increase red blood cell (RBC) deformability, has recently attracted much attention because of its possible effect of reducing capillary resistance. There has been practically no reliable demonstration of an increase in capillary blood flow by this drug.
N, Ohshima, M, Sato
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VELOCITY OF BLOOD FLOW IN SCHIZOPHRENIA

Archives of Neurology And Psychiatry, 1938
Our purpose in this study was to determine the rate of blood flow in patients with schizophrenia. The work of Blumgart 1 has stimulated interest in studies on the velocity of blood flow. The circulation time, while it does not directly determine the velocity of blood flow, is the denominator in the equation distance of pathway/circulation time equals ...
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Cerebral blood flow velocity in preterm neonates

Brain and Development, 1985
The postnatal changes of cerebral blood flow velocity in 35 preterm neonates with or without complications were measured with a bidirectional Doppler flow meter. In the cases without complications, the pulsatility index for the anterior cerebral artery (ACA-PI) was high shortly after birth, and gradually decreased after 6 hrs as that in normal term ...
Y, Ando, S, Takashima, K, Takeshita
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Retinal blood flow velocity in metabolic syndrome

Graefe's Archive for Clinical and Experimental Ophthalmology, 2013
Metabolic syndrome (MetS) is characterized by obesity, insulin resistance, dyslipidemia, and hypertension. The Retinal Function Imager (RFI) is a new technique for measuring retinal blood-flow velocity. This study aims to compare retinal blood flow velocity between MetS and healthy subjects.Twenty eyes of 20 MetS males and 21 eyes of 21 aged-matched ...
Shay, Gutfreund, Elena, Izkhakov, Russell, Pokroy, Marianna, Yaron, Hanny, Yeshua, Zvia, Burgansky-Eliash, Adiel, Barak, Ardon, Rubinstein   +7 more
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Portal Blood Velocity and Flow in Aging Man

Gerontology, 1989
The portal blood velocity and flow were measured by means of pulsed echo-Doppler in 60 normal subjects of 4 different age groups (less than or equal to 40, 41-55, 56-70, greater than or equal to 71 years). All subjects had normal routine liver function tests and no history of liver disease.
M, Zoli, T, Iervese, S, Abbati, G P, Bianchi, G, Marchesini, E, Pisi   +5 more
openaire   +2 more sources