The effect of an isotonic saline infusion on urinary sodium excretion and plasma renin activity (PRA) has been studied in 11 normotensive patients with a previous history of pregnancy-associated hypertension. The results have been compared with a group of controls matched for age, sex and parity. The results demonstrate an exaggerated natriuresis and a suppressed PRA response in the patients with a previous history or pregnancy-associated hypertension which is similar to those reported in patients with established 'essential' hypertension.
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