Echocardiographic tracings of the pulmonic valve were examined in two groups of patients. The first group contained 24 normal patients. The second group consisted of 32 patients with pulmonary hypertension (mean pulmonary artery pressure .20 mm Hg). Parameters considered included presence or absence and depth of the "a" wave, amplitude of valve opening (b-c separation), diastolic (e-f) slope, a...

Mitral valve cusp separation on M mode echogram, the mitral valve opening artefact, and the onset of forward transmitral flow recorded by Doppler echocardiography have all been taken to mark the end of isovolumic relaxation, while its onset has been taken either as the aortic closure sound (A2) recorded phonocardiographically or the aortic closure artefact determined by Doppler technique. Possi...

Double orifice mitral valve (DOMV) is an uncommon anomaly characterized by a mitral valve with a single fibrous annulus with two orifices opening into the left ventricle. Here we present a rare case of DOMV with ventricular septal defect (VSD) which was detected by 2-D echocardiography.

The high-pressure control valve of Weifang power generation Co. LTD unit one turbine happens to jitter during operation, especially in the low opening action, is more frequent. This situation serious for safety and stability generating unit. paper analyzes cause formulates effective reconstruction plans. After reform valve, it can maintain stable normal regulation ensure

Double-orifice mitral valve (DOMV) is an uncommon congenital anomaly, being present in 0.05% of the general population. The isolated occurrence of this anomaly is very rare and, to our knowledge, no data are currently available on the incidence of an isolated DOMV. A DOMV is characterized by a mitral valve with a single fibrous annulus with 2 orifices opening into the left ventricle (LV). Subva...

The design of an iodine working medium storage and supply system is one the key technologies for electrical propulsion medium. Solid sublimates into a gaseous state in tank, transported to thruster through flow control components such as proportional valve or throttle tube. However, has corrosive properties poor thermal conductivity, which can easily cause condensation tube valve, affecting acc...

A complete understanding of the flow past a mitral valve prosthesis require a new generation of pulse duplicators and more realistic flow conditions. The objective of this study is to describe the opening kinetics of a monoleaflet Medtronic Hall 27-mm mechanical valve in mitral position and to determine the flow pattern within the left ventricle using particle image velocimetry (PIV) for differ...

A 59-year-old woman was admitted with a presumptive diagnosis of infective endocarditis of a prosthetic aortic valve. Six months earlier, she had undergone aortic valve replacement with a porcine valve for the treatment of aortic valve regurgitation, replacement of the ascending aorta with a Dacron tube-graft, a Cox maze operation, and tricuspid ring annuloplasty. Transthoracic echocardiograms ...

Particle Image Velocimetry (PIV) is an important technique in studying blood flow in heart valves. Previous PIV studies of flow around prosthetic heart valves had different research concentrations, and thus never provided the physical flow field pictures in a complete heart cycle, which compromised their pertinence for a better understanding of the valvular mechanism. In this study, a digital P...

Previous studies of the dynamic geometry of the left ventricle have yielded conflicting results concerning shape changes during the preejection period. Accordingly, left ventricular dimensional changes prior to aortic valve opening in man were analyzed using high-speed biplane cineradiograms exposed in the frontal and lateral projections. In each projection the long axis and three chords perpen...