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Repeated measures (basal, 2 hours and 3 hours after 80 mg of oral furosemide) of direct renin concentration (A), aldosterone (B), and potassium (C) levels in the group of cases (patients with PA) and controls (primary hypertension and low-renin hypertension). PA, primary aldosteronism. Renin remained suppressed at baseline and during the test in several cases (for this reason the lines are overlapping).
