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The role of spironolactone in resistant hypertension management is unclear. The aim of this prospective trial was to evaluate the antihypertensive effect of spironolactone in patients with true resistant hypertension diagnosed by ambulatory blood pressure monitoring. A total of 175 patients had clinical and complementary exams obtained at baseline and received spironolactone in doses of 25 to 100 mg/d. A second ambulatory blood pressure monitoring was performed after a median interval of 7 months. Paired Student t test was used to assess differences in blood pressure before and during spironolactone administration, and multivariate analysis adjusted for age, sex, and number of antihypertensive drugs to assess the predictors of blood pressure fall. There were mean reductions of 16 and 9 mm Hg, respectively, in 24-hour systolic and diastolic blood pressures (95% CIs: 13 to 18 and 7 to 10 mm Hg; P&lt;0.001). Office systolic blood pressure and diastolic blood pressure also decreased (14 and 7 mm Hg). Controlled ambulatory blood pressure was reached in 48% of patients. Factors associated with better response were higher waist circumference, lower aortic pulse wave velocity, and lower serum potassium. No association with plasma aldosterone or aldosterone:renin ratio was found. Adverse effects were observed in 13 patients (7.4%). A third ambulatory blood pressure monitoring performed in 78 patients after a median of 15 months confirmed the persistence of the spironolactone effect. In conclusion, spironolactone administration to true resistant hypertensive patients is safe and effective in decreasing blood pressure, especially in those with abdominal obesity and lower arterial stiffness. Its addition to an antihypertensive regimen as the fourth or fifth drug is recommended.

Efficacy of Spironolactone Therapy in Patients With True Resistant Hypertension