Artificial heart valve was later changed to use silicone-coated material. The first implantation of mechanical heart valve to human was performed by Dr. Hufnagel on 11 September 1952, using the valve that he developed. This event accelerated the development of other artificial heart valves. 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.
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