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In 1929, the first catheterization of a human heart took place in Eberswalde, in the Federal State of Brandenburg, and was performed by Werner Forssmann, a German urologist. At that time, and for many years to come, the procedure was limited to investigations involving the right side of the heart. During the 1950s, and after undergoing further developments, the technique finally allowed access to be extended to the left side of the heart. In 1959, Mason Sones performed the first catheterization procedure involving contrast agents, which allowed selective visualization of the coronary arteries
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