Corticosteroids are powerful hormones naturally produced by the adrenal cortex. The body secretes two main types: glucocorticoids, such as cortisol, which regulate metabolism and immune response, and mineralocorticoids, such as aldosterone, which control electrolyte balance and blood pressure. Regulation of these hormones relies on the hypothalamic-pituitary-adrenal (HPA) axis. The hypothalamus releases corticotropin-releasing hormone, triggering the anterior pituitary to secrete adrenocorticotropic hormone, which then stimulates the adrenal glands to release cortisol. Synthetic corticosteroids mimic these natural hormones to reduce inflammation and suppress immune activity in various disease states.
Corticosteroids act by crossing cell membranes and binding to intracellular glucocorticoid receptors. This hormone-receptor complex enters the cell nucleus, where it alters gene transcription. Specifically, these drugs inhibit pro-inflammatory enzymes like phospholipase A2 and suppress inflammatory mediators such as prostaglandins and leukotrienes. Clinically, they are categorized by their potency and duration of action. Short-acting agents include hydrocortisone, intermediate-acting agents include prednisolone and methylprednisolone, and long-acting agents include dexamethasone.
Nurses administer corticosteroids across diverse clinical specialties due to their potent anti-inflammatory and immunosuppressive properties.
The choice of administration route depends on the targeted condition, onset speed required, and desired duration.
| Route | Clinical Example | Nursing Implication |
|---|---|---|
| Oral | Prednisolone tablets | Taken with food to prevent gastric irritation |
| Intravenous | Methylprednisolone | Used in acute, life-threatening emergencies |
| Inhaled | Beclomethasone | Requires mouth rinsing afterward to prevent thrush |
| Topical | Hydrocortisone cream | Applied sparingly to intact skin lesions |
Absorption and metabolism occur primarily in the liver, with renal excretion of metabolites.
Short-term therapy often brings mild, manageable side effects, whereas prolonged use causes widespread systemic changes.
A common misconception is that short-term bursts of oral steroids are entirely harmless; however, even brief courses can cause significant blood glucose spikes in vulnerable patients.
Nurses must systematically monitor patients receiving systemic corticosteroids to catch adverse changes early. Regular assessments include tracking daily weights for fluid retention, measuring blood pressure for hypertension, and checking blood glucose levels, especially in patients with diabetes. Nurses also monitor wound sites for signs of delayed healing and assess for subtle signs of infection, such as low-grade fever, since classic inflammatory signs may be masked by the medication.
Prolonged exposure to excess corticosteroids leads to iatrogenic Cushing's syndrome, characterized by specific physical changes. These include a moon face, buffalo hump, central obesity, and purple abdominal striae. Simultaneously, exogenous steroid intake suppresses the HPA axis through negative feedback. The adrenal cortex shrinks from lack of stimulation, leaving the body unable to produce its own cortisol if the drug is stopped suddenly.
Abruptly discontinuing corticosteroids after prolonged use can trigger acute adrenal crisis, characterized by severe hypotension, hypoglycemia, vomiting, and circulatory collapse. To prevent this, nurses must educate patients never to stop their medication suddenly. Instead, doses are gradually reduced over weeks or months to allow the HPA axis time to resume natural cortisol production. Nurses should also instruct patients to carry an emergency identification card indicating their steroid use.