The incidence of upper gastrointestinal haemorrhage within four months of renal transplantation was studied in two groups of patients. Thirty patients who received prophylactic cimetidine suffered no episodes of upper gastrointestinal haemorrhage, while six of the 33 patients who did not receive cimetidine suffered haemorrhages and one of them died as a result. The difference between the groups was significant. The results suggest that the prophylactic use of cimetidine in patients receiving renal transplants is worth while.
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