نتایج جستجو برای: valve timing
تعداد نتایج: 192876 فیلتر نتایج به سال:
Prolapsed Mitral Valve Syndrome is a common, benign disorder with prevalence of %0.3-6 in population. This syndrome also is known as Barlows Syndrome and Flaapy Mitral Valve Syndrome. Prolapsed Mitral Valve is the dropping of one or two mitral valve leaflet(s) into the left atrium during ventricular systole. This malformation leads to incomplete closing of mitral valve and regurgitates the bloo...
Abstract In patients with aortic stenosis, current guidelines recommend valve replacement therapy in case of severe narrowing combination symptoms and/or left ventricular dysfunction (ejection fraction < 50%). It is increasingly recognized that ejection offers a crude interpretation complex disease entity need refinement to optimize the timing and patient outcome. this state-of-the-art revie...
Introduction: With the development of interventional cardiology in the world, in addition to coronary and aortic diseases, the treatment of heart valve diseases through catheters has recently begun. The treatment of aortic stenosis (which was only possible with open surgery and valve replacement) was first performed in the world in 2002 by Alain Cribier in France with catheter insertion of the ...
BACKGROUND Scarce data exist on the incidence of and factors associated with valve hemodynamic deterioration (VHD) after transcatheter aortic valve replacement (TAVR). OBJECTIVES This study sought to determine the incidence, timing, and predictors of VHD in a large cohort of patients undergoing TAVR. METHODS This multicenter registry included 1,521 patients (48% male; 80 ± 7 years of age) w...
quadricuspid aortic valve (qav) is an uncommon congenital anomaly which was an incidental finding during surgery or autopsy in the past. we present the case of a 44-year-old woman with moderately severe aortic regurgitation due to unequal cusp size qav diagnosed via transesophageal echocardiography. due to echocardiographic imaging improvement, the diagnosis of qav is now easier and earlier tha...
BACKGROUND The objective of this study was to evaluate the timing, predictive factors, and prognostic value of cerebrovascular events (CVEs) after transcatheter aortic valve implantation. METHODS AND RESULTS The study included 1061 consecutive patients who underwent transcatheter aortic valve implantation with a balloon-expandable (64%) or self-expandable (36%) valve. CVEs were classified as ...
An unstable discharge rate occurs during dry fine powder from a hopper because of the significant two-phase solid/gas interactions that occur in flows. In addition, air bubble phenomenon may silo discharge. this study, we conducted experiments using semi-conical dual-structure hopper, and examined effects on internal flow structure, cavity fluid pressure, pressure inside airtight section, when ...
• The aortic incisura and the second heart sound have been considered simultaneous with and caused by aortic valve closure for many years. While Wiggers believed in a noiseless approximation of the semilunar valves and that after-vibrations of the closed valves and aortic blood column caused the second sound, the incisura was related to semilunar valve closure. Thus, subsequent studies relating...
Abstract Late intake valve closing (LIVC) Miller cycle was used on a highly-intensified single cylinder diesel engine to reduce the maximum combustion pressure and temperature. Three cams with three LIVC timings were designed tested bench. The gas exchange process of investigated by 1-D simulation model which calibrated experimental data. analysis conducted at constant speed 3600 r/min two IMEP...
Thermal efficiency and power density improvement are the main research foci of literature on diesel engines. The Miller cycle is considered to be one most promising methods engine operation. In this study, a fully variable valve timing lift mechanism (CD-HFVVS) was studied determine possibility Firstly, seat impact buffer in tested, which proved that can effectively eliminate impact. Then influ...
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