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
Human rights in Argentina by the Argentine 601st Intelligence Battalion in mid-July 1978, which started counting victims in 1975, gave the figure of 22,000 persons. This estimate was first published by John Dinges in 2004. Estimates by human rights organizations were up to 30,000. The Montoneros admitted losing 5,000 guerrillas killed, and the ERP admitted the loss of another 5,000 of their own guerrillas killed. By comparison, Argentine security forces cite 775 deaths of their own. In contrast, there were 13,500 victims of left-wing terrorism in Argentina. There is no agreement on the actual number of "detenidos-desaparecidos". In an interview with Buenos Aires daily