Diagnostic Accuracy of Seated Saline Suppression Test for Primary Aldosteronism

"Seated saline infusion test: All participants received the infusion of 2 liters of 0.9% saline over 4 h in seated posture.~Fludrocortisone suppression test:Patients received 0.1 mg oral fludrocortisone every 6 h for 4 days, together with slow-release potassium chloride and sodium chloride supplements.~Captopril challenge test:Patients received 50 mg captopril orally at 8-9 a.m. after sitting or standing for at least 1 h. Blood samples were drawn at time zero and 2 h after the challenge."