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 suicide. In March a federal court released two Coast Guard constables who were arrested in connection with the case. In March 2008 the National Human Rights Secretariat pressed homicide charges against former economy minister Jose Martinez de Hoz, who served under the military dictatorship, for the death of economist Juan Carlos Casariego Del Bel. In March 2008 former navy lieutenant commander Ricardo Cavallo was extradited from Spain to Argentina to face charges of crimes against humanity committed during the military dictatorship. Cavallo was indicted in July and remained in pretrial detention at year's end. In May 2008 federal authorities indicted