نتایج جستجو برای: pulsatile blood flow
تعداد نتایج: 1092055 فیلتر نتایج به سال:
Blood flow in human arteries is dominated by time-dependent transport phenomena. In particular, in the abdominal segment of the aorta under a patient's average resting conditions, blood exhibits laminar flow patterns that are influenced by secondary flows induced by adjacent branches and in irregular vessel geometries. The flow dynamics becomes more complex when there is a pathological conditio...
The pattern of pulmonary blood flow was studied in three patients after a total cavopulmonary shunt procedure. Doppler studies showed a phasic pattern of flow which varied with the respiratory cycle. Pulmonary blood flow was increased with normal inspiration, and was much augmented by the Mueller manoeuvre. This suggests that flow was occurring when a negative intrathoracic pressure was generat...
The nature of the pulmonary capillary blood flow is fundamental for the understanding both of pulmonary hemodynamics and of respiratory gas exchange. Direct examinations of the surface of the lung in the cat, rabbit, dog and rat (1-5) have indicated that pulmonary capillary blood flow is basically non-pulsatile. On the other hand, experimental studies by Lee and DuBois (6), using the body pleth...
A functional Fourier domain optical coherence tomography instrument offering spectral Doppler imaging of in vivo pulsatile human retinal blood flow was constructed. An improved phase-resolved algorithm was developed to correct bulk motion artifacts. Spectral Doppler imaging provides complementary temporal flow information to the spatially distributed flow information of the color Doppler image ...
The paper presents a numerical investigation of pulsatile blood flow in arterial vasculatures of a mouse retina using a Womersley model incorporating an appropriate outlet boundary impedance at the end of the terminal vessels of the arterial tree (pre-capillary arterioles). The mouse retinal flatmount was prepared for confocal microscopy and the morphometric information of the vasculature was o...
Platelet adhesion in the annular perfusion system developed by Baumgartner was studied under pulsatile, oscillatory, or steady flow conditions. To investigate in what way pulsatile flow affects platelet adhesion, we developed a flow system that produces a sinusoidal laminar flow superimposed on a constant component in the annular perfusion chamber. Frequencies and amplitudes of this sinusoidal ...
HSR Proceedings in Intensive Care and Cardiovascular Anesthesia 2011, Vol. 4 Corresponding author: Giulio Melisurgo Cardiovascular and Thoracic Department Università Vita-Salute San Raffaele Via Olgettina, 60 20132 Milan, Italy e-mail: [email protected] Continuous-flow ventricular assist devices (VADs) are the standard of care for implantable mechanical circulatory support (1). However, s...
Objectives: Vitals are the most important parameters for assessing a patient’s status and National Early Warning Score helps to assess vitals predict how urgent condition is. The perfusion index is ratio of pulsatile blood flow non-pulsatile/static in peripheral tissue. We aimed investigate relationship between courses evaluate whether NEWS PI useful predicting outcomes older patients an Emerge...
131 DOI: 10.5963/BER0203002 Development of a Miniaturized Fiber-optic LDV Sensor for Local Blood Velocity Measurement Local Velocity and Flow Profile Measurement of Pulsatile Blood Flow Modeled in Humans Shimpei Kohri, Tsutomu Tajikawa, Kenkichi Ohba Department of Medical Engineering, Aino University 4-5-4, Higashiohda, Ibaraki city, Osaka 567-0012 Japan Department of Mechanical Engineering, Ka...
We investigate the feasibility of photoacoustic (PA) imaging for assessing the correlation between red blood cell (RBC) aggregation and the oxygen saturation (sO2) in a simulated pulsatile blood flow system. For the 750 and 850 nm illuminations, the PA amplitude (PAA) increased and decreased as the mean blood flow velocity decreased and increased, respectively, at all beat rates (60, 120 and 18...
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