heart valve
Quick Summary
The heart has four valves: the tricuspid, mitral, pulmonary, and aortic valves. These valves are crucial for ensuring blood flows in only one direction through the heart, preventing backflow.12
- Atrioventricular valves (tricuspid and mitral) are located between the atria and ventricles. The tricuspid valve has three flaps, while the mitral valve has two. They open to allow blood from the atria into the ventricles and close when the ventricles contract to prevent blood from returning to the atria.1
- Semilunar valves (pulmonary and aortic) are situated where the pulmonary artery and aorta leave the ventricles. These pocket-like valves open to allow blood to be pumped out of the ventricles into the arteries and close to prevent blood from flowing back into the ventricles.13
The closure of these valves produces the audible sounds of a heartbeat. Abnormalities in these valves, such as stenosis (narrowing) or regurgitation (incomplete closure), can lead to serious cardiovascular issues.134
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cardiovascular diseaseAbnormalities of the atrial septumā¦atrial septum may involve the atrioventricular valves and may be associated with incompetence of these valves. In its most extreme form, there may be virtually no septum between the two atrial chambers. Atrial septal defect is a noncyanotic type of congenital heart disease and usually is not associated with seriousā¦
Read Moreā¦atrial septum may involve the atrioventricular valves and may be associated with incompetence of these valves. In its most extreme form, there may be virtually no septum between the two atrial chambers. Atrial septal defect is a noncyanotic type of congenital heart disease and usually is not associated with seriousā¦
Read More- cardiovascular diseaseDiseases of the endocardium and valves
ā¦on the surface of a heart valve or, less commonly, in a blood vessel wall or in the endocardium (inner lining) of the heartāusually occurs where there has been some previous lesion, either congenital or acquired. Most frequently the location is at the line of closure of the valve. Theā¦
Read Moreā¦on the surface of a heart valve or, less commonly, in a blood vessel wall or in the endocardium (inner lining) of the heartāusually occurs where there has been some previous lesion, either congenital or acquired. Most frequently the location is at the line of closure of the valve. Theā¦
Read More - cardiovascular diseasePhysical injuries
ā¦the aorta, rupture of the heart valves, or rupture of the heart itself.
Read Moreā¦the aorta, rupture of the heart valves, or rupture of the heart itself.
Read More - cardiovascular diseaseRheumatic heart disease
ā¦may in turn lead to heart failure.
Read Moreā¦may in turn lead to heart failure.
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history of medicineHeart surgeryā¦operated successfully on the aortic valve. In 1923 Elliott Cutler of Boston used a tenotome, a tendon-cutting instrument, to relieve a girlās mitral stenosis (a narrowing of the mitral valve between the upper and lower chambers of the left side of the heart) and in 1925, in London, Henry Souttarā¦
Read Moreā¦operated successfully on the aortic valve. In 1923 Elliott Cutler of Boston used a tenotome, a tendon-cutting instrument, to relieve a girlās mitral stenosis (a narrowing of the mitral valve between the upper and lower chambers of the left side of the heart) and in 1925, in London, Henry Souttarā¦
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transplantHeart valvesā¦dangerous, since both a blocked valve and a valve that allows blood to leak backward create a strain on the heart that can lead to heart failure. If the valve is seriously damaged, it can be replaced with a xenograft valve or a manufactured mechanical valve. Neither is ideal. Xenograftā¦
Read Moreā¦dangerous, since both a blocked valve and a valve that allows blood to leak backward create a strain on the heart that can lead to heart failure. If the valve is seriously damaged, it can be replaced with a xenograft valve or a manufactured mechanical valve. Neither is ideal. Xenograftā¦
Read More- cardiovascular diseaseValvular disease
Destroyed heart valves can be replaced with artificial valves (prostheses) made of stainless steel, Dacronā¢, or other special materials. The heart-lung machine is used during these operations, in which one, two, or even three cardiac valves may be removed and replaced with the appropriate artificial valve.ā¦
Read MoreDestroyed heart valves can be replaced with artificial valves (prostheses) made of stainless steel, Dacronā¢, or other special materials. The heart-lung machine is used during these operations, in which one, two, or even three cardiac valves may be removed and replaced with the appropriate artificial valve.ā¦
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materials scienceCardiovascular devicesFor example, mechanical heart valve implants are intended for long-term use. Consequently, the hinge points of each valve leaflet and the materials must have excellent wear and fatigue resistance in order to open and close 80 times per minute for many years after implantation. In addition, the openā¦
Read MoreFor example, mechanical heart valve implants are intended for long-term use. Consequently, the hinge points of each valve leaflet and the materials must have excellent wear and fatigue resistance in order to open and close 80 times per minute for many years after implantation. In addition, the openā¦
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