during valve replacement surgery a valve that comes from an animal is known as
Tissue heart valves
title: Valve replacement text: Valve replacement Valve replacement surgery is the replacement of one or more of the heart valves with either an artificial heart valve or a bioprosthesis (homograft from human tissue or xenograft e.g. from pig). It is an alternative to valve repair. There are four procedures Current aortic valve replacement approaches include closed heart surgery, Very invasive cardiac surgery (VICS) and Very invasive, Scapulae-based aortic valve replacement. Catheter replacement of the aortic valve (called trans-aortic valve replacement or implementation [TAVR or TAVI]) is a minimally invasive option for those suffering from aortic valve stenosis. TAVR is commonly performed by guiding a title: Aortic valve replacement text: for a relatively long time before symptoms develop. Surgery is indicated for symptoms such as shortness of breath, and in cases where the heart has begun to enlarge (dilate) from pumping the increased volume of blood that leaks back through the valve. There are two basic types of artificial heart valve: mechanical valves and tissue valves. Tissue heart valves are usually made from animal tissue, either animal heart valve tissue or animal pericardial tissue. The tissue is treated to prevent rejection and calcification. There are alternatives to animal tissue valves. In some cases a homograft – a human aortic valve title: Organ replacement in animals text: heart is bypassed. The defective heart valve is removed and the replacement valve, typically from bovine pericardium, is precisely sewn into place. The dog’s heart is then restarted and monitored for at least two hours after the surgery is completed. Due to the expense, this is not a common procedure. While small dogs and cats can survive comfortably with three legs, larger dogs, horses, and farm animals require the limb to support their weight. Surgery has also been done on birds that are used for breeding purposes. Each prosthetic limb is custom-made to fit the individual needs of the specific title: Valve replacement text: valves have similar overall outcomes with respect to stroke and survival. Valve replacement Valve replacement surgery is the replacement of one or more of the heart valves with either an artificial heart valve or a bioprosthesis (homograft from human tissue or xenograft e.g. from pig). It is an alternative to valve repair. There are four procedures Current aortic valve replacement approaches include closed heart surgery, Very invasive cardiac surgery (VICS) and Very invasive, Scapulae-based aortic valve replacement. Catheter replacement of the aortic valve (called trans-aortic valve replacement or implementation [TAVR or TAVI]) is a minimally invasive option for those suffering title: Aortic valve replacement text: aortic valve replacement (TAVR), which delivers a new valve to the site of the diseased valve through a catheter. The replacement valve is collapsed and packaged in a way similar to a stent. Once in place it is expanded, pushing the old valve’s leaflets out of the way, and functions in place of the old valve. The catheter may be inserted through the femoral artery or through a small incision in the chest and then through a large artery or the tip of the left ventricle. Guidelines suggest TAVR for most patients over 75 and surgical replacement for most patients