A 65-year-old man was referred with refractory heart failure. A 27-mm Carbomedics bileaflet valve for mitral valve stenosis had been implanted 20 years earlier. The electrocardiogram showed atrial fibrillation with severe bradycardia (30-50/min). Transthoracic echocardiography demonstrated both prosthetic leaflets opening in late diastole (Picture A, arrows), and the anterolateral leaflet inter...

Due to the stringent legislation for emission of diesel engines and also increasing demand on fuel consumption, the importance of detailed 3D simulation of fuel injection, mixing and combustion have been increased in the recent years. In the present work, FIRE code has been used to study the detailed modeling of spray and mixture formation in a Caterpillar heavy-duty diesel engine. The paper pr...

Air bubbles mixed in the hydraulic oil of power transmission systems causes deterioration dynamic characteristics system, component erosion, accelerated oil, reduced heat dissipation, and vibration noise. In this paper, a method to controlling air bubble content by swirling flow working has been proposed developed. The amount flowing out separation device can be adjusted opening closing valve o...

JOHN WRIGHT This has been evolved with a modified pulse duplicator and the use of a hot film probe for measuring velocity, direction, and turbulence. Many of the commercially available mitral valve prostheses are being investigated for their flow characteristics. In addition, efficiency is being examined and some unusual findings point to the possibility of a hydraulic ram effect in the normal ...

Method Total of fifty-five formalin-fixed adult human cadaveric hearts studied. Following measurements were noted: a.) length of coronary sinus, b). its relation to left coronary artery, mitral valve annulus and left atrium, c.) number of atrial and ventricular tributaries, d.) distance and the opening angles of major tributaries from the coronary ostium, e.) length and width of coronary ostium...

OBJECTIVE : To test an alternative to catheter and open-heart techniques, by documenting the feasibility of implanting an unmodified mechanical aortic valve (AoV) in the off pump, beating heart using the universal cardiac introducer (UCI) attached to the left ventricular (LV) apex. METHODS : In six pigs, the LV apex was exposed by a median sternotomy. The UCI was attached to the apex. A 12-mm...

We present the case of a 42-year-old man who underwent tissue mitral valve replacement for symptomatic mitral stenosis. Post-operative course was unremarkable but three-dimensional transoesophageal echocardiography clearly indicated that one cusp had very restricted motion with incomplete opening and premature closure. The cause of this early single cusp failure is unclear. It was not related t...

A rare case of an infant with "double inlet right ventricle" (straddling mitral valve) and double outlet right ventricle is described. Coarctation of the aorta was associated. A left-to-right shun*t resulted from part of the mitral valve opening into the right ventricle and also from the presence of a ventricular septal defect. The infant's clinical features reflected the shunt, although the va...

This paper investigates multiple-valve closures in a simple reservoir-valve-pipeline-valve system. Multiple closing (or opening) of valves may induce large positive or low negative pressure waves due to wave interference (superposition the waves). The effect closure can be either beneficial detrimental, with outcome being entirely dependent on position and sequence delay closures. Valves are in...

rosthetic valve thrombosis (PVT) is a rare complication, and most of PVT occurs in patients with mechanical valves. We present 2 extremely rare cases of acute biopros-thetic mitral valve thrombosis immediately after mitral valve replacement under veno-arterial extracorporeal membrane oxygenation (VA-ECMO) and anticoagulant therapy. In Case 1, a 75-year-old woman underwent aortic valve replaceme...