Addison's disease, also known as primary adrenal insufficiency, is a rare and chronic endocrine disorder. It happens when the adrenal glands located just above the kidneys fail to produce enough steroid hormones, primarily cortisol and aldosterone. Cortisol regulates the body's response to stress, blood pressure, and metabolism, while aldosterone helps maintain sodium and potassium balance in the blood. Without these vital hormones, the body struggles to maintain normal fluid balance and blood pressure, especially during physical stress, illness, or trauma.
In most cases, Addison's disease is an autoimmune condition where the body's immune system mistakenly attacks and destroys the adrenal cortex. Other historical and less common causes include tuberculosis infections affecting the adrenal glands, fungal infections, metastatic cancer, or bleeding into the glands. In Nigeria and other regions, infectious causes like tuberculosis remain important considerations when evaluating chronic adrenal failure, alongside autoimmune processes.
The onset of Addison's disease is typically insidious, with symptoms developing slowly over several months.
Diagnosing Addison's disease involves blood tests to measure hormone levels and specialized stimulation tests. Doctors check baseline morning cortisol and ACTH levels. A low cortisol level paired with a high ACTH level points directly to a problem in the adrenal glands rather than the pituitary. The definitive test is the ACTH stimulation test, where synthetic ACTH is injected and blood cortisol is measured afterward. If the adrenal glands fail to raise their cortisol output, Addison's disease is confirmed. Electrolyte panels typically show hyponatremia and hyperkalemia.
Medical treatment requires lifelong daily replacement of the missing steroid hormones. Patients take oral hydrocortisone tablets, usually divided into two or three doses daily to mimic the body's natural circadian rhythm. To replace aldosterone, a daily dose of fludrocortisone is prescribed. Doses must be carefully adjusted during periods of physical stress, illness, or surgery to prevent a dangerous drop in blood pressure.
An Addisonian crisis is a life-threatening medical emergency triggered by severe physical stress, sudden withdrawal of corticosteroid therapy, or an untreated infection. Symptoms include sudden, severe pain in the lower back, abdomen, or legs, profound weakness, vomiting, diarrhea, dehydration, and dangerous hypotension leading to shock. Emergency treatment requires immediate intravenous access, rapid infusion of normal saline, and high-dose intravenous hydrocortisone injections.
Midwives and nurses play a vital role in educating patients to manage their condition safely at home. Patients must understand the absolute necessity of never stopping their medication abruptly. Education should cover recognizing early signs of a crisis, increasing oral medication doses during minor illnesses, and wearing a medical alert bracelet at all times. Patients must also learn how to self-administer emergency intramuscular hydrocortisone injections if vomiting prevents oral intake.