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 and from work. Workers have the right to remove themselves from dangerous or unhealthy work situations without jeopardy to continued employment. However, workers who leave the workplace before it has been proven unsafe risk being fired; in such cases the worker has the right to judicial appeal, but the process can be very lengthy. 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