نتایج جستجو برای: pressure wave
تعداد نتایج: 612837 فیلتر نتایج به سال:
With advancing age, arterial stiffness and wave reflections increase and elevate systolic and pulse pressures. An elevated central pulse pressure is generally ascribed to increased wave reflection and portends an unfavorable prognosis. Using arterial tonometry, we evaluated central (carotid-femoral) and peripheral (carotid-brachial) pulse wave velocity, amplitudes of forward and reflected press...
BACKGROUND AND OBJECTIVES To investigate the impact of age on arterial stiffness and blood pressure (BP) variables in newly diagnosed untreated hypertension (HT). SUBJECTS AND METHODS A total of 144 patients with newly diagnosed untreated HT were divided into two groups: young group (age ≤50 years, n=71), and old group (age >50 years, n=73). BP variables were measured on office or 24 hours am...
Increased arterial stiffness and excessive pressure pulsatility have emerged as important risk factors for a number of common disorders of aging, including cardiovascular disease, stroke, cognitive impairment, and renal disease. The triple-threat combination of robust associations between arterial stiffness and the foregoing disorders, a marked increase in arterial stiffness with advancing age ...
Background: The relationship between serum homocysteine levels and cardiovascular diseases has been elucidated since many years ago. In this study, the association between serum levels of homocysteine, folic acid, and vitamin B12 with the pulse wave velocity and Buckberg index or subendocardial viability ratio was assessed in individuals with diabetes and also non-diabetic subjects. Metho...
This research paper presents an incompressible smoothed particle hydrodynamics (ISPH) technique to investigate a regular wave overtopping on the coastal structure of different types. The SPH method is a mesh-free particle modeling approach that can efficiently treat the large deformation of free surface. The incompressible SPH approach employs a true hydrodynamic formulation to solve the fluid ...
Simultaneous effects of slip and heat transfer on peristaltic transport of an incompressible electrically conducting viscous fluid in an asymmetric channel is studied under the assumptions of long wavelength and low Reynold number .The asymmetry is produced by choosing the peristaltic wave train on the walls to have different amplitudes and phase.Exect solutions for stream function,velocity ...
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