Adrenal Insufficiency and Crisis Management

Introduction to Adrenal Insufficiency

Adrenal insufficiency requires replacement therapy with glucocorticoids and mineralocorticoids, with hydrocortisone being the preferred agent due to its mineralocorticoid activity 1
Hydrocortisone has a short-acting half-life of approximately 90 minutes, whereas dexamethasone has a long-acting extended biological half-life 1
Hydrocortisone binds to both mineralocorticoid and glucocorticoid receptors, whereas dexamethasone binds almost exclusively to glucocorticoid receptors 2

The American College of Critical Care Medicine recommends a hydrocortisone dose of 200 mg per day for septic shock when hemodynamic stability cannot be achieved with fluids and vasopressors, with a preference for continuous infusion over intermittent bolus dosing, and should be tapered when vasopressors are no longer required 3

The European Society of Gastrointestinal Endoscopy recommends that patients on chronic steroids (>4 weeks) should receive equivalent IV hydrocortisone perioperatively 4
Standardized steroid-taper protocols should be implemented in the postoperative period to avoid inappropriate prolongation of steroids after surgery 4
Hydrocortisone is the drug of choice for stress dose steroid coverage in surgical patients 5
IV infusion of hydrocortisone is superior to IM injection for maintaining plasma cortisol levels 1

The European Society of Medical Oncology recommends a single IV dose of 20 mg for cisplatin-induced emesis or 8 mg for cyclophosphamide/anthracycline-based chemotherapy 6

The American Academy of Otolaryngology-Head and Neck Surgery strongly recommends a single intraoperative dose of IV dexamethasone, which reduces postoperative nausea, vomiting, pain, and improves time to oral intake 7
Dexamethasone is approximately 25 times more potent than hydrocortisone with a longer duration of action, but lacks mineralocorticoid activity, making it unsuitable as the sole agent for patients with primary adrenal insufficiency 1
The relative potency of dexamethasone is 25-30 times more potent than hydrocortisone, with 8 mg of dexamethasone equivalent to 200 mg of hydrocortisone in glucocorticoid effect 1

Dexamethasone is preferred when a potent anti-inflammatory effect is needed, or when a longer duration of action is beneficial, such as in single daily dosing or prevention of postoperative nausea and vomiting 1, 8
Hydrocortisone is preferred when mimicking physiologic cortisol replacement is desired, or when both glucocorticoid and mineralocorticoid effects are needed 1
Dexamethasone (8 mg) provides adequate glucocorticoid coverage for 24 hours but lacks mineralocorticoid activity 1
Both dexamethasone and hydrocortisone can cause hyperglycemia, but dexamethasone's longer duration may prolong this effect 9
Hydrocortisone appears to have fewer adverse neurodevelopmental effects compared to dexamethasone in bronchopulmonary dysplasia 2
Dexamethasone has been associated with adverse effects on hippocampal neurons in animal models 2
Hydrocortisone has shown fewer adverse neurodevelopmental outcomes in neonatal studies 2