No data are available from populations of African ancestry who have a high prevalence of low renin, sodium, and diuretic-sensitive hypertension.

This immediate pressor response was absent in only five high renin patients and, conversely, was very large in three low renin patients.

The increases of these were significantly greater in essential hypertensives than in normotensives, and greater in the low renin group than the normal renin group.

Urinary dopamine excretion was significantly lower in the low renin essential hypertensives, while no significant difference was found between normotensives and normal renin essential hypertensives.