Several techniques are currently in use for mitral valve reconstruction. We report a mitral repair case in which the use of a combination of different surgical techniques resulted in the necessary correction. A 47-year-old woman underwent surgical intervention to treat severe mitral valve insufficiency due to A1/A2/A3 and P2 prolapsed valve tissue. A combination of quadrangular resection, slidi...

Stiction in control valve is one of the long-standing and common problems in the process industries, which accelerates equipment wear and even affects the stability of closed-loop systems. A valve stiction model is proposed to describe the dynamic feature of sticky valve. To detect and quantify valve stiction, a bootstrap Hammerstein system identification procedure is proposed. Through the iden...

Passive systems possess the beneficial properties of ease of human control, and stable interaction with arbitrary passive systems. Motivated by these properties, our research has been directed towards developing passive hydraulic systems. A novel hydraulic element called the passive valve was first developed. The passive valve was used in single degree of freedom passive bilateral teleoperation...

background total correction of tetralogy of fallot (tof) anomaly in early childhood has been practiced in many centers with good results, but in some of patients after few years sever pulmonary valve insufficiency occurred. materials and methods at a cross- sectional study from january 2015 to january 2016, 10 patients who had history of primary repair of tof with free pulmonary insufficiency (...

repair of the mitral valve is the treatment of choice for mitral valve regurgitation when the anatomy is favorable. it is well known that mitral valve repair enjoys better clinical and functional results than any other type of valve substitute. this fact is beyond doubt regardless of the etiology of the valve lesion and is of particular importance in degenerative diseases. this review analyzes ...

OBJECTIVE Atrial fibrillation (AF) is the most formidable supraventricular tachyarrhythmia, which worsens the natural course of mitral valve disease. In this study, we evaluated early and long-term results and quality of life (QOL) after simultaneous surgical radiofrequency ablation (RFA) of AF, left atrial reduction and mitral valve repair or replacement. METHODS Overall, 147 patients with m...

The objective of the present paper is a numerical analysis of the flow forces acting on spool surfaces of a pressure regulated valve. The transient, compressible and turbulent flow structures inside the valve are simulated using ANSYS FLUENT coupled with a special UDF. Here, valve inlet pressure is varied in a stepwise manner. For every value of inlet pressure, transient analysis leads to a qua...

  Introduction: Aortic valve sclerosisis considered as a manifestation of coronary atherosclerosis. Recent studies demonstrated an association between aortic valve sclerosis and obstructive coronary artery disease. The purpose of this study was to evaluatethe correlation betweenaortic valve sclerosis andobstructive coronary artery disease and the extent of coronary artery disease in patients ho...