Elsevier

The Lancet

Volume 383, Issue 9935, 21–27 June 2014, Pages 2152-2167
The Lancet

Seminar
Adrenal insufficiency

https://doi.org/10.1016/S0140-6736(13)61684-0Get rights and content

Summary

Adrenal insufficiency is the clinical manifestation of deficient production or action of glucocorticoids, with or without deficiency also in mineralocorticoids and adrenal androgens. It is a life-threatening disorder that can result from primary adrenal failure or secondary adrenal disease due to impairment of the hypothalamic–pituitary axis. Prompt diagnosis and management are essential. The clinical manifestations of primary adrenal insufficiency result from deficiency of all adrenocortical hormones, but they can also include signs of other concurrent autoimmune conditions. In secondary or tertiary adrenal insufficiency, the clinical picture results from glucocorticoid deficiency only, but manifestations of the primary pathological disorder can also be present. The diagnostic investigation, although well established, can be challenging, especially in patients with secondary or tertiary adrenal insufficiency. We summarise knowledge at this time on the epidemiology, causal mechanisms, pathophysiology, clinical manifestations, diagnosis, and management of this disorder.

Introduction

Adrenal insufficiency is a life-threatening disorder that can result from primary adrenal failure or secondary adrenal disease due to impairment of the hypothalamic–pituitary axis.1, 2, 3 It is the clinical manifestation of deficient production or action of glucocorticoids, with or without deficiency also in mineralocorticoids and adrenal androgens. The cardinal clinical symptoms of adrenocortical insufficiency, as first described by Thomas Addison in 1855, include weakness, fatigue, anorexia, abdominal pain, weight loss, orthostatic hypotension, and salt craving; characteristic hyperpigmentation of the skin occurs with primary adrenal failure.4, 5 Whatever the cause, adrenal insufficiency was invariably fatal until 1949, when cortisone was first synthesised,6, 7, 8, 9 and glucocorticoid-replacement treatment became available. However, despite this breakthrough, the diagnosis and treatment of patients with the disorder remain challenging.

Section snippets

Epidemiology

According to the underlying mechanism, adrenal insufficiency is classed as primary, secondary, or tertiary. Primary adrenal insufficiency results from disease intrinsic to the adrenal cortex. Central adrenal insufficiency, the collective name for the secondary and tertiary types, is caused by impaired production or action of corticotropin. Secondary adrenal insufficiency results from pituitary disease that hampers the release of corticotropin or from a lack of responsiveness of the adrenal

Primary adrenal insufficiency

The causes of primary adrenal insufficiency are listed in table 1. In developed countries, 80–90% of cases of primary adrenal insufficiency are caused by autoimmune adrenalitis, which can be isolated (40%) or part of an autoimmune polyendocrinopathy syndrome (60%).1, 2, 19, 32, 33, 34 Autoimmune Addison's disease is characterised by destruction of the adrenal cortex by cell-mediated immune mechanisms. Antibodies against steroid 21-hydroxylase are detected in about 85% of patients with

Pathophysiology and clinical presentation

The adrenal cortex has three distinct zones, which secrete the various hormones under the direct control of well understood feedback mechanisms. Aldosterone is synthesised in the outermost zone, the zona glomerulosa. Its secretion is predominantly regulated by the renin–angiotensin system and extracellular potassium concentrations; therefore, it is not impaired in secondary and tertiary adrenal insufficiency. Cortisol secretion from the zona fasciculata is primarily regulated by corticotropin,

Diagnosis of adrenal insufficiency

There are three main aims in the diagnosis of adrenal insufficiency (table 5): to confirm inappropriately low cortisol secretion; to find out whether the adrenal insufficiency is primary or central; and to delineate the underlying pathological process.1, 2, 3

Whatever the cause, the diagnosis of adrenal insufficiency depends entirely on the demonstration that cortisol secretion is inappropriately low. All current stimulation tests measure total cortisol concentration, which is related closely to

Treatment

Adrenal insufficiency is potentially life-threatening. Treatment should be initiated as soon as the diagnosis is confirmed, or sooner if the patient presents in adrenal crisis (panel).1, 2, 3, 4, 5

A very important part of the management of chronic adrenal insufficiency is education of the patient and his or her family. They need to understand the importance of life-long replacement therapy, the need to increase the usual glucocorticoid dose during stress, and the need to notify medical staff if

Adrenal insufficiency in critically ill patients

Adrenal insufficiency is common in critically ill patients and is increasingly reported in sepsis, severe pneumonia, adult respiratory stress syndrome, trauma, HIV infection, or after treatment with etomidate.2, 123, 124, 125, 126, 127 It can also be associated with structural damage to the adrenal gland, pituitary gland, or hypothalamus; however, many critically ill patients develop reversible failure of the HPA axis.2, 123, 124, 125, 126

The underlying pathophysiological mechanisms leading to

Search strategy and selection criteria

We searched PubMed and the Cochrane Library for original articles and reviews related to adrenal insufficiency, which were published in English between 1966 and April, 2013. We used the search terms “adrenal insufficiency”, in combination with the terms “incidence”, “prevalence”, “cause”, “origin”, “diagnosis”, “function test”, “imaging”, “hydrocortisone”, “glucocorticoid”, “mineralocorticoid”, “dehydroepiandrosterone”, “management”, “treatment”, “therapy”, “replacement”, “surveillance”,

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