• Gian Paolo Rossi, Giulio Ceolotto, Giacomo Rossitto, Giuseppe Maiolino, Maurizio Cesari, and Teresa Maria Seccia.
• Clinica dell'Ipertensione Arteriosa, Department of Medicine - DIMED; University of Padova, Padova, Italy.
• J. Clin. Endocrinol. Metab. 2020 Jun 1; 105 (6).

ContextWhile current guidelines recommend the withdrawal of mineralocorticoid receptor antagonist (MRA) and renin-angiotensin system blockers for the screening and detection of primary aldosteronism (PA), this can worsen hypokalemia and control of high blood pressure (BP) values.ObjectiveTo investigate whether aldosterone/renin ratio (ARR) values were affected by the MRA canrenone and/or by canrenone plus olmesartan treatment in patients with PA.DesignWithin-patient study.SettingThe European Society of Hypertension center of excellence at the University of Padua.PatientsConsecutive patients with an unambiguous diagnosis of PA subtyped by adrenal vein sampling.InterventionsPatients were treated for 1 month with canrenone (50-100 mg orally), and for an additional month with canrenone plus olmesartan (10-20 mg orally). Canrenone and olmesartan were up-titrated over the first 2 weeks until BP values and hypokalemia were controlled. Patients with unilateral PA were adrenalectomized; those with bilateral PA were treated medically.Main Outcome MeasuresBP, plasma levels of sodium and potassium, renin and aldosterone.ResultsCanrenone neither lowered plasma aldosterone nor increased renin; thus, the high ARR and true positive rate remained unaffected. Addition of the angiotensin type 1 receptor blocker raised renin and slightly lowered aldosterone, which reduced the ARR and increased the false negative rate.ConclusionsAt doses that effectively controlled serum potassium and BP values, canrenone did not preclude an accurate diagnosis in patients with PA. Addition of the angiotensin type 1 receptor blocker olmesartan slightly raised the false negative rate. Hence, MRA did not seem to endanger the accuracy of the diagnosis of PA.© Endocrine Society 2020. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

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