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  • Review Article
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Review Article

Primary aldosteronism, a common entity? the myth persists

Journal of Human Hypertension volume 16, pages 159–162 (2002)Cite this article

Abstract

Primary aldosterone excess or hyperaldosteronism is an important cause of hypertension which, when associated with an aldosterone secreting adenoma, is amenable to surgical cure. The biochemical hallmarks of the condition are a relative excess of aldosterone production with suppression of plasma levels of renin (a proxy for angiotensin II, the major trophic substance regulating aldosterone secretion). This combination of a high aldosterone and a low renin is however more commonly associated with ‘nodular hyperplasia’ of the adrenal glands, a condition not improved by surgery and variably responsive to the effects of the mineralocorticoid antagonist, spironolactone. Until recently the prevalence of either form of secondary hypertension has been thought to be low such that few clinicians ‘hunted’ for it in the absence of hypokalaemia (the traditional clue for the syndrome). This view has been challenged, firstly by the realisation that no more than 50% of such patients will have a low plasma potassium and secondly by the assumption that a ‘normal’ plasma aldosterone is in fact inappropriately elevated if the renin level is low. A single measurement of the ratio of aldosterone to renin levels is claimed to be highly predictive of patients who will have primary aldosterone excess. This paper examines the logic behind such claims and presents evidence from the literature that an abnormal ratio is simply a different description of the low renin state and that such patients do not necessarily have mineralocorticoid hypertension. Most patients ‘discovered’ by this test will have what many call low-renin hypertension, a condition not amenable to specific therapy. Claims that they are peculiarly sensitive to the hypotensive effects of spironolactone have not been tested in controlled trials. The test would however be expected to pick up those individuals with true Conn's syndrome but such patients remain too few in number to justify widespread use of an expensive screening test.

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  1. Based upon a paper presented at the Annual Scientific Meeting of the British Hypertension Society, held in Glasgow, September 1999.

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  1. Department of Medical Sciences, Western General Hospital, University of Edinburgh, Scotland, UK

    P L Padfield

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  1. P L Padfield
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Padfield, P. Primary aldosteronism, a common entity? the myth persists. J Hum Hypertens 16, 159–162 (2002). https://doi.org/10.1038/sj.jhh.1001321

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