Examples of tricuspid valve in the following topics:
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- Valvular heart disease is any disease process involving one or more of the valves of the heart (the aortic and mitral valves on the left and the pulmonary and tricuspid valves on the right).
- Valvular heart disease includes aortic and mitral valve disorders, and pulmonary and tricuspid valve disorders.
- Pulmonary and tricuspid valve diseases are right-side heart diseases.
- Both tricuspid and pulmonary valve diseases are less common than aortic or mitral valve diseases due to the lower pressure those valves experience.
- Ebstein's anomaly is an abnormality of the tricuspid valve.
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- The tricuspid valve is the three-leaflet valve on the right side of the heart, between the right atrium and the right ventricle, and stops the backflow of blood between the two.
- The tricuspid valve functions similarly to the bicuspid valve, except that three chordae tendinaea connect the cusps of the valve to three papillary muscles, rather than the pairthat connects the bicuspid valve.
- Besides this feature, blood passes through the tricuspid valve the same way, based on a pressure gradient from high pressure to low pressure during systole and diastole.
- The reason that the right-side valve is tricuspid whereas the left-side valve is not, is not fully understood, but is thought to arise due to differences in tissue structure and pressure that occur during fetal development.
- Describe the operation of the atrioventricular valves, the mitral/bicuspid and tricuspid valves
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- The two major heart sounds are 'lub' (from the closure of AV-valves) and 'dub' (from the closure of aortic and pulmonary valves).
- The closing of the heart valves produces a sound.
- It is caused by the closure of the mitral, and tricuspid valves as ventricular systole begins.
- There is a very slight split between the closure of the mitral and tricuspid valves, however it is not long enough to create multiple sounds.
- S2 is split because aortic valve closure occurs before pulmonary valve closure.
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- The fibrous rings encircle the bases of the valves of the heart.
- The aortic ring: encircles the aortic valve.
- The pulmonary ring: encircles the pulmonary valve.
- The left fibrous ring: encircles the bicuspid valve.
- The right fibrous ring: encircles the tricuspid valve.
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- The blood is then pumped through the tricuspid valve into the right ventricle.
- From the right ventricle, blood is pumped through the pulmonary valve and into the pulmonary artery.
- Once entering the left heart, the blood flows through the bicuspid valve into the left ventricle.
- The blood is then pumped through the mitral valve into the left ventricle.
- From the left ventricle, blood is pumped through the aortic valve and into the aorta, the body's largest artery.
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- The vena cava fills the right atrium with blood, which then ejects blood into the right ventricle by passing through the tricuspid valve.
- After blood fills in the right ventricle, it contracts and pumps the blood through the pulmonary valve, and into the pulmonary arteries.
- This blood then enters and fills inside the left atrium, which pumps it through the mitral valve (also called bicuspid) into the left ventricle.
- The blood fills inside the left ventricle and is then pumped through the aortic valve into the aorta, which marks the beginning of systemic circulation.
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- Heart murmurs are pathologic heart sounds indicative of valve and blood flow abnormalities.
- Positive Carvallo's sign describes the increase in intensity of a tricuspid regurgitation murmur with inspiration.
- Anatomical sources of heart murmurs include stenosis of the bicuspid aortic valve which tends to appear between 40 and 70 years of age, and stenosis of the tricuspid aortic valve where symptoms more likely to appear after 80 years of age.
- The first heart sound is caused by the atrioventricular valves--Mitral (M) and Tricuspid (T)--and the second heart sound is caused by the semilunar valves--Aortic (A) and Pulmonary/Pulmonic (P).
- Heart murmurs are often the result of leaky valves.
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- Blood passively flows into the atria without passing through valves.
- There are valves between the atria and ventricles (the mitral and tricuspid valves), and the atria undergo atrial systole, a brief contraction of the atria, which ejects blood from the atria through the valves and into the ventricles.
- The chordae tendinae are elastic tendons that attach to the valve from the ventricles and relax during atrial systole and ventricular diastole, but contract and close off the valve during ventricular systole.
- There are no atrial inlet valves to interrupt blood flow during atrial systole.
- During ventricular systole, the ventricles contract, pumping blood through the semi-lunar valves into systemic circulation.
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- These valves do not have chordae tendineae, and are more similar to valves in veins than to atrioventricular valves.
- The semilunar valves act in concert with the atrioventricular valves to direct blood flow in the heart.
- When the atrioventricular valves are open, the semi lunar valves are shut and blood is forced into the ventricles.
- This anterior view of the heart indicates the semilunar valves, the aortic and pulmonary valves.
- Describe the operation of the semilunar valves, the aortic and pulmonary valves
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- Varicose veins, typically found in the legs, are those that have become enlarged and tortuous due to malfunctioning valves.
- Veins have leaflet valves to prevent blood from flowing backwards; this backflow is called retrograde or reflux flow.
- When veins become varicose, the leaflets of the valves no longer meet properly, and the valves no longer work.
- Figure A shows a normal vein with a working valve and normal blood flow.
- Figure B shows a varicose vein with a deformed valve, abnormal blood flow, and thin, stretched walls.