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Article Abstract
Objectives: Primary aldosteronism (PA) is an underdiagnosed yet important condition. This study aimed to evaluate the diagnostic performance of a combined protocol using oral salt loading and postural stimulation tests (PST), named the balance study, to confirm and subtype PA.
Methods: We retrospectively analyzed the data of 402 patients with either confirmed PA or essential hypertension who underwent the balance study. Biochemical markers were measured using liquid chromatography-tandem mass spectrometry. Receiver operating characteristic curves were used to assess the diagnostic performance. The cut-off values for biochemical markers were determined by Youden J's statistics.
Results: For PA confirmation, urinary aldosterone (UALD; area under the curve [AUC] 0.894), urinary tetrahydroaldosterone (UTHA; AUC 0.875), the sum of UALD and UTHA (SUM; AUC 0.884), and supine plasma aldosterone (PALD; AUC 0.902) showed comparable performance. Corresponding cut-offs were: UALD>38 nmol/day, UTHA>160 nmol/day, SUM>259 nmol/day, and supine PALD>273 pmol/L. For PA subtyping, the difference or ratio between erect and supine PALD in PST achieved an AUC of 0.90. An increase of less than 19 pmol/L or less than 5 % from a supine to an erect position suggested an aldosterone-producing adenoma.
Conclusions: This combined protocol using oral salt loading and PST could help confirm a diagnosis of PA and predict the subtype. UTHA and supine PALD may add value to UALD for PA confirmation, whereas the erect/supine PALD ratio from PST could assist in PA subtyping. Further studies are required to validate these findings.
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