<p>Bilateral renal artery stenosis or a single kidney with unilateral renal artery stenosis. Patients with collagen vascular disease, acute MI at risk of further haemodynamic deterioration, angioedema unrelated to ACE inhibitor therapy, aortic stenosis and hypertrophic cardiomyopathy. Increased risk of angioedema in black patients. Renal impairment. Lactation. Childn &lt;6 yr.</p>