ACE inhibitors are one of the most exciting and interesting of recent medical developments. They fit the patho-physiologica1 processes of cardiovascular disease with fascinating precision and are a constant stimulus to the acquisition of greater understanding of the mechanisms involved and of the mode of action of the drugs themselves. There is still much to be learned, especially about the wider effects of the drugs, their precise mode and site of action and about differences between the different preparations. ACE inhibitors are of proven benefit to patients with chronic congestive heart...