A heart valve normally allows blood flow in only one direction through the heart. The four valves commonly represented in a mammalian heart determine the pathway of blood flow through the heart. A heart valve opens or closes incumbent upon differential blood pressure on each side.
The four valves in the heart are:
- The two atrioventricular (AV) valves, which are between the atria and the ventricles, are the mitral valve and the tricuspid valve.
- The two semilunar (SL) valves, which are in the arteries leaving the heart, are the aortic valve and the pulmonary valve.
A form of heart disease occurs when a valve malfunctions and allows some blood to flow in the wrong direction. This is called regurgitation.
Other articles related to "heart valve, heart, heart valves, valve, valves":
... An artificial heart valve is a device implanted in the heart of a patient with heart valvular disease ... When one of the four heart valves malfunctions, the medical choice may be to replace the natural valve with an artificial valve ... This requires open-heart surgery ...
... Heart failure due to acute aortic regurgitation is a surgical emergency associated with high mortality ... Heart failure may occur after rupture of ventricular aneurysm ... whether the patient had a history of a repaired congenital heart disease as they often have complex cardiac anatomy with artificial grafts and shunts that ...
... Usually the aortic and mitral valves are incorporated in valve studies within a single degree of freedom ... These relationships are based on the idea of the valve being a structure with a single degree of freedom ... Equations for the aortic valve in this case A=cross sectional area of valve L=axial length of valve Atrioventricular valve ...
... Further information Artificial heart valve#Biological valves Biological valves are valves of animals, like pigs, which undergo several chemical procedures in order ... The porcine (or pig) heart is most similar to the human heart, and therefore represents the best anatomical fit for replacement ... Implantation of a porcine valve is a type of Xenotransplantation, or Xenograft, which means a transplant from one species (in this case a pig) to another ...
... One study of human users of "ecstasy" found that they did have heart valve changes suggestive of early cardiac fibrosis, which were not present in non-ecstasy using controls ... and it is most likely that as with other 5-HT2B agonists, development of heart valve damage will be highly dependent on the frequency and duration of use and the total cumulative ... underwent surgery to replace a defective aortic heart valve ...
Famous quotes containing the word heart:
“We dreamed that a great painter had been born
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To that stern colour and that delicate line
That are our secret discipline
Wherein the gazing heart doubles her might....”
—William Butler Yeats (18651939)