A 60-year-old man underwent aortic valve replacement with a bileaflet mechanical valve for aortic regurgitation and mitral valve repair using a prosthetic ring for mitral regurgitation (MR). Intraoperative transesophageal echocardiography (TEE) confirmed no residual MR and a normally functioning aortic prosthetic valve without a paravalvular leak. One week after the operation, transthoracic ech...

INTRODUCTION valve disease is an important cause of heart failure. There is a direct relationship between valve deterioration and the patient's inflammatory status and cytokines: interleukin-6, interleukin-1, tumor necrosis factor, and C-reactive protein, involved in this major state of inflammation. OBJECTIVE to report a series of cases of valve replacement, using a bioprosthetic or mechanic...

This paper presents a failure analysis on a failed intake valve in a gasoline engine. During an endurance test, an intake valve was broken and caused some damages on the piston. Material examinations (by a light microscope and also a scanning electron microscope) were conducted on the fracture surface of the intake valve shaft. Results showed that no pores or defects could be observed and the m...

Background The implantation of an mechanical valve in many cases remains the best treatment option for acquired valve disease. Mechanical valves, despite necessity of chronic anticoagulation, has excellent durability and favorable hemodynamic parameters. The aim of our study was to evaluate the perioperative mortality in patients undergoing implantation of a mechanical valve and identifying ris...

in recent socio-economic state it is not possible to have different sets of prosthetic cardiac valves available in the operating room before open-heart surgery for valvular replacement. in this study the diameter of the aortic valve ring measured in 2-d echocardiography was compared with the size of the aortic prosthetic valves implanted for the patients with aortic valvular disease. the purpos...

PURPOSE Mechanical valve replacement is associated with complications, however, there is little information on the quality of life (QOL) of octogenarians who had undergone mechanical valve replacement at a relatively younger age. We examined survival, valve-related events, and the QOL of octogenarians who had undergone mechanical valve replacement. METHODS A total of 56 octogenarians who unde...

The incidence of systemic embolization with mechanical valves is 1% per year [1]. Most cases present as cerebrovascular events. As the incidence of mechanical valve surgery has increased in recent years, systemic thromboembolism has become an important problem. Although coronary embolism due to mechanical valve thrombosis is encountered rarely, it is an important and serious complication. We re...

OBJECTIVE The optimal orientation of a bileaflet mechanical valve for tricuspid valve replacement (TVR) has not yet been determined. The aim of this study was to use fiberoptic cardioscopy to evaluate the effect of orientation of a mechanical valve implanted in the tricuspid position on bileaflet mechanical valve behavior. METHODS Twelve pigs (50-59 kg) underwent TVR with a St. Jude Mechanica...

BACKGROUND The Ross procedure has become an accepted and sometimes preferred alternative to mechanical aortic valve replacement. One criticism of the Ross procedure is that it may have a higher operative mortality, morbidity, and cost. Several groups have shown that this operation can be performed safely with less than 3% mortality. The issue of higher cost has not been resolved. In this retros...

BACKGROUND An understanding of the relationship between venous valve architecture and associated fluid and solid mechanical forces will undoubtedly advance prosthesis design and treatments. The objective of the current study was to compare three valve architectures (mono-, bi-, and tricuspid) and the implications of these designs on the fluid and solid mechanics of the valve leaflets. The hypot...