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Clinical and economic effects of replacing enalapril with benazepril in hypertensive patients.

Study sample The study sample was a random selection of 104 medical records from the records of 1500 patients who had been switched to benazepril from enalapril during the two years of the prescribing programme. Thirty-two (30.7%) of those records were excluded as they did not meet the criteria of having two blood pressure measurements following the switch to benazepril. Power calculations were not used to determine the sample size.