Related Experiment Videos
Functional tests for primary aldosteronism: value of captopril suppression
Marie-Claude Racine1, Pierre Douville, Marcel Lebel
1CHUQ, L'Hôtel-Dieu de Québec Hospital, 11 Côte du Palais, Québec, (QC), G1R 2J6, Canada.
Current Hypertension Reports
|May 11, 2002
Summary
New reference values for the aldosterone/renin ratio aid in diagnosing primary aldosteronism. Ratios below 100 suggest essential hypertension, while those above 140 indicate primary aldosteronism, with intermediate values requiring further testing.
Area of Science:
- Endocrinology
- Hypertension Research
- Clinical Diagnostics
Background:
- Increased detection of primary aldosteronism due to simpler screening tests.
- Lack of established reference values for aldosterone/renin ratio (ARR) using SI units for plasma aldosterone (pmol/L) and active renin (ng/L).
Purpose of the Study:
- Establish reference values for the aldosterone/renin ratio (ARR) in diagnosing primary aldosteronism.
- Define diagnostic thresholds for essential hypertension versus primary aldosteronism using ARR.
Main Methods:
- Studied 153 subjects with normal blood pressure, essential hypertension, or primary aldosteronism.
- Measured plasma aldosterone (SI units) and plasma active renin (immunoradiometric assay).
- Calculated aldosterone/renin ratio (ARR) in pmol/L/ng/L.
Main Results:
- Essential hypertensive patients typically have ARR < 100 pmol/L/ng/L.
- Primary aldosteronism patients typically have ARR > 140 pmol/L/ng/L.
- ARR values between 100-140 pmol/L/ng/L warrant repeat testing.
Conclusions:
- The aldosterone/renin ratio provides diagnostic value for primary aldosteronism.
- The captopril suppression test is a safe and effective confirmatory test for primary aldosteronism, alternative to salt loading.
- Established reference ranges improve diagnostic accuracy for primary aldosteronism.