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1-6) Of the 10 patients who received orthotopic heart transplants, 4 lived for more than 18 months; 2 of them became long-term survivors, one living for over 13 years and the other for over 24 years.
Currently, in studies of orthotopic heart transplants, where the donor organ is placed in the normal life-sustaining position in the chest, the longest a nonhuman primate has survived supported by a pig heart has been 39 days, a result the authors nonetheless see as encouraging.