Atrial natriuretic factor in essential hypertension

We measured circulating levels of immunoreactive atrial natriuretic factor (ANF) in 10 patients with untreated, uncomplicated mild to moderate essential hypertension and in 15 normotensive controls. ANF concentrations were significantly higher in the hypertensive group than in the control group (38.4 ± 6.9 pg/ml versus 18.3 ± 1.8 pg/ml, p < 0.02). A positive correlation between ANF levels and systolic, diastolic and mean blood pressure was noted in the total study population (p < 0.008, r = 0.52; p < 0.005, r = 0.55; p < 0.02, r = 0.46, respectively). Thus, plasma ANF concentrations are elevated in essential hypertension and may result from increased intraarterial pressure.