Glucocorticoid remediable aldosteronism (GRA), an autosomal dominant c
ause of primary aldosteronism, has been described as resulting in seve
re hypertension with premature death from stroke. We describe two new
large pedigrees which include subjects who have the abnormal chimaeric
gene strongly linked to GRA. The majority of affected members, who ha
ve only mild hypertension and normal biochemistry, are clinically indi
stinguishable from patients with essential hypertension. It is therefo
re Likely that this condition is underdiagnosed.