Survival of heart allografts in rats treated with azathioprine and sodium salicylate.

In a rat heart transplant model representing a severe mismatch, median survival time (M.S.T.) with no treatment was 6 days. M.S.T. with azathioprine was 6 days, and with azathioprine and methylprednisolone 7 days. Azathioprine with promethazine hydrochloride gave an M.S.T. of 15 days. In rats treated with sodium salicylate alone M.S.T. was 16 days, and when azathioprine was administered for 12 days in a group continuously treated with sodium salicylate, all hearts were beating normally at 50 days.