Method Twenty patients with AS without aortic insufficiency underwent AVR using bioprostheses were recruited. Preand post-AVR cardiac function parameters and aortic valve parameters were collected by transthoracic echocardiography. To evaluate the influences of peripheral vascular resistance on transvalvular flow velocity, static distensibility parameters of the carotid artery, such as b stiffn...

BACKGROUND Accelerated arterial aging and inadequate outward arterial remodeling are observed in end-stage renal disease (ESRD) patients. Whether these changes could be closely associated with arterial calcifications has never been investigated. METHODS 155 ESRD patients and 105 age-, sex-, and blood pressure-matched control subjects were included. Common carotid artery (CCA) pressure, diamet...

background: as various implant geometries present different biomechanical behaviors, the purpose of this work was to study stress distribution around tapered and cylindrical threaded implant geometries using three-dimensional finite element stress analysis.     methods: seven implant models were constructed using the cad system. after digitized models of mandibular section, the crowns were crea...

DOBRIN, PHILIP B., AND ALLEN A, &NICK. hj%ence of mmlmsmooth muscle on contractile meclzanics and elasticity of arteries, Am, J. Physiol. 2 17(6) : 1644-1651. 1969.---Segments of canine carotid artery were held at in situ length and studied in vitro after treatment with norepinephrine (NEpi) and after treatment with potassium cyanide (KCN). Activation of the vascular muscle caused contraction a...

in this research, the influence of adding micro- and nano- sized calcium carbonate powders to nylon-66 was investigated. mechanical properties of micro and nano- composites, including tensile strength, elongation, and young’s modulus, before and after ageing, were determined and analyzed. for this purpose, micro- and nano-sized caco3 particles were used as fillers to prepare micro-composites (c...

OBJECTIVE Proteoglycans organize the extracellular matrix, act as signaling molecules, and are involved in cell migration and proliferation. They may play an important role in arterial geometric and elastic properties. The aim of the present study was to determine large artery phenotype in patients with pseudoxanthoma elasticum (PXE), a genetic disease characterized by proteoglycan accumulation...

The effect of acute myocardial ischemia on the myocardial elastic modulus has been a matter of controversy. To evaluate this question, diastolic elastic modulus was assessed by finite element analysis of left ventricular geometry using three-dimensional echocardiographic reconstructions and right and left ventricular pressure recordings. Elastic properties were estimated before and after corona...

the high blood rate that often occurs in arteries may play a role in artery failure and tortuosity which leads to blackouts, transitory ischemic attacks and other diseases. however, vibration and instability analysis of carotid arteries are lacking. the objective of this study is to investigate the vibration and instability of the carotid arteries conveying blood under axial tension with surrou...

Heart failure with a preserved ejection fraction (HFpEF) is the dominant form of heart failure in the older population. The primary chronic symptom in HFpEF is severe exercise intolerance; however, its pathophysiology and therapy are not well understood. We tested the hypothesis that older patients with HFpEF have increased arterial stiffness beyond what occurs with normal aging and that this c...