A number of large randomised controlled trials have shown that angiotensin-converting enzyme (ACE) inhibitors, compared with placebo or other blood pressure-lowering drugs, improve coronary heart disease outcomes (fatal and nonfatal myocardial infarction, and coronary revascularisation) in diverse patient groups, e.g. in primary and secondary prevention, those with and without left ventricular dysfunction, and among hypertensive and non-hypertensive