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 Human rights in Argentina The history of human rights in Argentina is affected by the Dirty War and its aftermath. The Dirty War, a state-sponsored violence against Argentine citizenry from roughly 1976 to 1983, was carried out primarily by Jorge Rafael Videla's military government, ended years ago, and the human rights situation in Argentina has improved since. According to the "Nunca Más" report issued by the National Commission on the Disappearance of Persons (CONADEP) in 1984, about 9,000 people had "disappeared" between 1976 and 1983. According to a secret cable from DINA (Chilean secret police) in Buenos Aires, an estimate