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lüll Is aldosterone the missing link in refractory hypertension?: aldosterone-to-renin ratio as a marker of inappropriate aldosterone activity Lim PO; Jung RT; MacDonald TMJ Hum Hypertens 2002[Mar]; 16 (3): 153-8Use of the random aldosterone-to-renin ratio (ARR) as a reliable marker of inappropriate aldosterone activity has led to primary aldosteronism (PA) being increasingly diagnosed in hypertensive patients. At least 10% of hypertensives have been found to have PA, the majority of whom presumably have bilateral adrenal hyperplasia or idiopathic hyperaldosteronism as an aetiology for PA. Whilst these patients clearly have excess aldosterone activity, they have in common many features that are found in hypertensive patients in general, amongst which include heightened angiotensin II adrenal sensitivity. Whether these individuals belong within the spectrum of 'essential hypertension' is being debated, but is probably irrelevant clinically since they appear to respond favourably to spironolactone treatment. In addition, there is recent evidence suggesting that these patients overexpress a key enzyme involved in aldosterone production, the aldosterone synthase, the activity of which appears to relate to its genotypic variation.|Aldosterone/*blood/metabolism[MESH]|Antihypertensive Agents/therapeutic use[MESH]|Biomarkers/blood[MESH]|Humans[MESH]|Hyperaldosteronism/diagnosis/*epidemiology[MESH]|Hypertension/*complications/drug therapy[MESH]|Prevalence[MESH]|Renin-Angiotensin System[MESH]|Renin/*blood[MESH] |