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Mitral valve diseases
The heart is a pump consisting of 4 chambers:2 atria and 2 ventricles and 4 valves one of them is mitral valve which is located betweenthe left atrium and the left ventricle and prevents the backward flow of blood.Ithas several unique features: Mitral annulus, two leaflets, the chordae tendineaeand papillary muscles. The mitral valve may become stenotic or may regurgitate. Regurgitation(or leakage of the valve): When the valve (s) do not close completely. Stenosis (or narrowing of the valve): When the valve (s) opening becomes narrowed. Mitral stenosis is categorized as mild, moderate or severe it is typically causedby (Rheumatic fever, A congenital heart, Calcium deposits .....) and it caused severalsymptoms such as: dyspnea, hemoptysis, fatigue, Chest pain and others Where as the Signs and symptoms of mitral valve regurgitation, can include: Abnormal heart sound, Shortness of breath, Heart palpitations, Fatigue, edma, Coughing.
From Bulk to Nano : The Many Sides of Magnetism
The field of magnetism is rapidly advancing in this new millennium, revealing an ever-wider diversity of magnetic phenomena on more than one scale. With the emergence of countless applications particularly on a nanoscale, and their unpredictable implications mostly on a macroscale, it may seem that different aspects of magnetism are unrelated. Quite often, the overwhelming amount of topics discussed in the professional literature views only parts of a field, ignoring a broader context. Therefore, the present book aims at addressing the relationship between apparently unconnected topics in magnetism. Less obvious relationships are revealed among individual fields on various scales, making them better understandable.
Diagnosis of Process Nonlinearities and Valve Stiction : Data Driven Approaches
In this book, Higher Order Statistical (HOS) theory is used to develop indices for detecting and quantifying signal non-Gaussianity and nonlinearity. These indices, together with specific patterns in the mapping of process output and controller output are used to diagnose the causes of poor control loop performance.
Cardiac reconstructions with allograft tissues
Cryopreserved allograft tissues are now standard materials for the reconstructive cardiac surgeon. Since publication of the first edition ("Cardiac Reconstructions with Allograft Valves") in 1989, the field has progressed dramatically with increased clinical use of cardiovascular allograft tissues, with the development of new surgical techniques, and with advances in the understanding of the fundamentals of valve transplantation biology and cryopreservation. As a result, over two-thirds of the present volume represents new material. Fifty-six authors bring their expertise to thirteen comprehensive, lavishly illustrated sections which discuss the principles of the use of homograft valves, major clinical series of homograft valves for both left and right ventricular outflow tracts, cryopreserved allograft tissue for cardiac reconstruction, cell biology of heart valve leaflets, cryobiology of heart valve preservation, morphological, biochemical, and explant pathology studies of allograft heart valves, allograft valve banking, as well as detailed explanation of surgical techniques for valve and root methods for left and right ventricular outflow tract reconstructions, the Ross operation and variants, and complex reconstructions. A final section presents potential future directions for the field. Over 400 illustrations, created expressly for this book, depict the surgical techniques from the perspective of the surgeon standing at the operating table.
Aortic valve disease
Your heart has four valves to keep blood flowing in the direction. These valves include the mitral valve, tricuspid valve, pulmonary valve and aortic valve. Each valve has flaps (epiphysis or leaflets) that opens and close once during each heartbeat sometimes the valve do not open or close completely; this interferes with the flow of blood inside the heart, and may lead to impaired ability to pump blood to your body. In aortic valve disease, the aortic valve between the lower left chamber (left ventricle) and the primary artery that delivers blood from the heart to the body (the aorta) does not work completely. It may not close completely; This causes blood to leak back into the left ventricle (regurgitation), or possibly narrowing of the valve (stenosis).
