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Karl Landsteiner discovered that you could determine a persons type of blood by markers on the persons red blood cells, making it safer for a person to do blood transfusions.
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This timeline describes some of the discoveries for andvances in the Cardiovascular System.
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Charles Drew established blood banks during WWll, for he discovered that transfusions could be done sucesfuly with plasma if whole bloos wasn't available, saving millions of people on and off the battlefield.
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Helen Taussig identified the heart deffect in "Blue Babies", saving these babies from their lack of the needed oxygen, and also finding an effective operation to correct the defect.
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Christaan Barnard preformedthe first transplant of a human heart, paving thee way for futur successes in these transplants.
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An artificial heart was tested that year and the reciever of the heart lived for 112 days after recieving the heart. Artificial hearts are now somtimes used today temperarly for people who are waiting to recieve a heart transplant.
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Once aproved in the USA, this laser beam helped many with arterie blockage by a machine invented to shoot a laser beam to burn away the blockage.