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Hyperaldosteronism, also aldosteronism,[1] is a medical condition wherein too much aldosterone is produced by the adrenal glands, which can lead to lowered levels of potassium in the blood (hypokalemia) and increased hydrogen ion excretion (alkalosis).

Hyperaldosteronism
Aldosterone-2D-skeletal.svg
Aldosterone
Classification and external resources
Specialty endocrinology
ICD-10 E26
ICD-9-CM 255.1
OMIM 103900 605635
DiseasesDB 6187
MedlinePlus 000330
eMedicine radio/354
Patient UK Hyperaldosteronism
MeSH D006929

This cause of mineralocorticoid excess is primary hyperaldosteronism reflecting excess production of aldosterone by adrenal zona glomerulosa. Bilateral micronodular hyperplasia is more common than unilateral adrenal adenoma.

Video explanation

Contents

Signs and symptomsEdit

CauseEdit

The causes of primary hyperaldosteronism are adrenal hyperplasia and adrenal adenoma (Conn's syndrome). These cause hyperplasia of aldosterone-producing cells of the adrenal cortex resulting in primary hyperaldosteronism. The causes of secondary hyperaldosteronism are massive ascites, left ventricular failure, and cor pulmonale. These act either by decreasing circulating fluid volume or by decreasing cardiac output, with resulting increase in renin release leading to secondary hyperaldosteronism.

DiagnosisEdit

When taking a blood test, the aldosterone-to-renin ratio is abnormally increased in primary hyperaldosteronism, and decreased or normal but with high renin in secondary hyperaldosteronism.

TypesEdit

In endocrinology, the terms 'primary' and 'secondary' are used to describe the abnormality (e.g., elevated aldosterone) in relation to the defect, i.e., the tumor's location. Hyperaldosteronism can also be caused by plant poisoning, where the patient has been exposed to too much licorice. Licorice is a perennial herb that is used in making candies and in cooking other desserts because of its sweet taste. It contains the chemical glycyrrhizin, which has medicinal uses, but at higher levels it can be toxic. It has the potential for causing problems with sodium and potassium in the body. It also interferes with the enzyme in the kidneys that converts cortisol to cortisone.

PrimaryEdit

Primary aldosteronism (hyporeninemic hyperaldosteronism) was previously thought to be most commonly caused by an adrenal adenoma, termed Conn's syndrome. However, recent studies have shown that bilateral idiopathic adrenal hyperplasia is the cause in up to 70% of cases. Differentiating between the two is important, as this determines treatment. Also see congenital adrenal hyperplasia. Adrenal carcinoma is an extremely rare cause of primary hyperaldosteronism. Two familial forms have been identified: type I (dexamethasone suppressible), and type II (that has been linked to 7p22.)[3]

Features

Investigations

Management

  • Adrenal adenoma: surgery
  • Bilateral adrenocortical hyperplasia: aldosterone antagonist, e.g., spironolactone

SecondaryEdit

Secondary refers to an abnormality that indirectly results in pathology through a predictable physiologic pathway, i.e., a renin-producing tumor leads to increased aldosterone, as the body's aldosterone production is normally regulated by renin levels.

One cause is a juxtaglomerular cell tumor. Another is renal artery stenosis, in which the reduced blood supply across the juxtaglomerular apparatus stimulates the production of renin. Likewise, fibromuscular dysplasia may cause stenosis of the renal artery, and therefore secondary hyperaldosteronism. Other causes can come from the tubules: Hyporeabsorption of sodium (as seen in Bartter and Gitelman syndromes) will lead to hypovolemia/hypotension, which will activate the RAAS.

TreatmentEdit

Treatment includes spironolactone, a potassium-sparing diuretic that works by acting as an aldosterone antagonist.

See alsoEdit

ReferencesEdit

  • Williams, Cheryll J. 2012. Medicinal Plants in Australia. Sydney: Rosenberg Publishing

External linksEdit