This paper presents a numerical study of the behaviour of wall shear stress (WSS) in three-dimensional pulsatile flow through an axisymmetric stenosed artery. A realistic blood flow rate (250 ml min−1 at rest in coronary artery [7]) and cardiac cycle (T=0.84s [5]) are applied in the simulations. The flow is fully three-dimensional, and the fluid is assumed to be Newtonian and incompressible. Di...

BACKGROUND The factors that influence pulsatile ocular blood flow (POBF) were evaluated in normal subjects. METHODS POBF was measured in 80 normal subjects using Langham OBF computerised tonometry. The effect of age, systolic and diastolic blood pressure, refractive error, intraocular pressure, and axial length on POBF was evaluated using multiple regression analysis. RESULTS The mean (SD) ...

The present paper sheds some light on investigating the effect of pulsatility on flow through a tapered artery. Blood has been represented by a nonNewtonian fluid obeying Herschel-Bulkley equation. Using the Reynolds number as the perturbation parameter, a perturbation technique is adopted to solve the resulting quasi-steady non-linear coupled implicit system of differential equations. Analytic...

AIM To compare pulsatile ocular blood flow (POBF) and intraocular pressure (IOP) between eyes of patients receiving either peribulbar (with and without balloon compression) or subconjunctival local anaesthesia (LA). METHODS 30 eyes of 30 patients undergoing cataract surgery by phacoemulsification were investigated in a study of parallel group design. Ten patients had peribulbar LA and 10 minu...

Measurements of the intraocular pressure (IOP) pulse and pulsatile ocular blood flow (POBF) have been made in 22 patients with bilateral low tension glaucoma (LTG) and 29 healthy subjects matched as closely as possible for age, refractive error, IOP, systemic pulse pressure, and heart rate. Recordings were made in both the standing and supine positions. The amplitude of the intraocular pressure...

We report on wide-field imaging of pulsatile motion induced by blood flow using heterodyne holographic interferometry on the thumb of a healthy volunteer, in real time. Optical Doppler images were measured with green laser light by a frequency-shifted Mach-Zehnder interferometer in off-axis configuration. The recorded optical signal was linked to local instantaneous out-of-plane motion of the s...

Introduction Time-of-Flight MR Angiography (TOF MRA) is a commonly used non contrast enhanced technique for vessel visualization. To extend the spatial coverage of TOF arteriography, this study addresses the combination of axial 2D TOF imaging and Continuously Moving Table (CMT) acquisitions for imaging the peripheral arteries. Since arterial blood flow is highly pulsatile in the periphery, inf...

Introduction: Arterial stiffness is an important predictor of cardiovascular risk. Several indices have been  introduced to estimate the arterial stiffness based on the changes in the brachial blood pressure. Since the  substitution  of  the  blood  pressure  changes  in  the  central  arteries  such  as  carotid  with  the  blood  pressure  changes in the brachial results in error in the blood...

BACKGROUND Decellularized animal organs have been used as scaffolds for tissue engineering. To make a properly functioning scaffolds, the extracellular matrix (ECM) components must be preserved after decellularization. Because pulsatile flow is known to be beneficial for tissue perfusion, pulsatile perfusion of a detergent might decrease the exposure time of the tissues to the detergent used fo...

The abnormalities of cerebral vasoreactivity were evaluated in CS2 poisoning cases. In 34 retired workers with CS2 poisoning (case group) and 20 healthy individuals (control group), blood flow velocities were measured in the middle cerebral arteries (MCA) by transcranial Doppler. Compared with the control group, the case group showed lower mean values of blood flow velocities and pulsatile indi...