Artificial heart valve Artificial heart valve An artificial heart valve is a device implanted in the heart of a patient with valvular heart 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. Valves are integral to the normal physiological functioning of the human heart. Natural heart valves are evolved to forms that perform the functional requirement of inducing unidirectional blood flow through the valve structure from one chamber of the heart to another. Natural heart valves become dysfunctional for a variety of pathological causes. Some
Education in Argentina are a significant number of private schools and universities. The education in Argentina known as the "Latin American docta" has had a convoluted history. There was no effective education plan until President Domingo Sarmiento (1868–1874) placed emphasis on bringing Argentina up-to-date with practices in developed countries. Sarmiento encouraged the immigration and settling of European educators and built schools and public libraries throughout the country, in a programme that doubled the enrollment of students during his term; in Argentina, Teacher's Day (on September 11) commemorates his death. The first national laws mandating universal, compulsory, free and secular education (Law 1420 of