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Cyrogenic open-heart procedure

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A cyrogenic open-heart procedure was a surgical procedure in use during the late 2260s. The technique involved a complete transfusion requiring a great deal of blood.

Dr. Leonard McCoy performed this procedure in 2268 on Vulcan Ambassador Sarek while en route to the Babel Conference following repeated heart attacks due to a malfunction in one of his heart valves. (TOS: "Journey to Babel")

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