Treatment and Stress-Dosing Protocol for Central (Secondary) Adrenal Insufficiency
For maintenance therapy, use hydrocortisone 15-25 mg daily in 2-3 divided doses; for stress dosing, double the physiologic replacement dose (40 mg hydrocortisone daily) for minor stress, and use parenteral hydrocortisone 100 mg IV bolus followed by 200 mg/24h continuous infusion for major stress. 1
Maintenance Replacement Therapy
The standard glucocorticoid replacement for central adrenal insufficiency is:
- Hydrocortisone 15-25 mg daily divided into 2-3 doses, adjusted based on body weight and individual adrenal reserve 2
- Typical dosing pattern: Higher dose in morning, lower doses at midday and evening to mimic physiologic cortisol rhythm
- No mineralocorticoid (fludrocortisone) replacement is needed in secondary adrenal insufficiency, unlike primary adrenal insufficiency
Stress-Dosing Protocol
The stress-dosing approach depends on the severity of physiologic stress:
Minor Stress
(Fever, infection requiring antibiotics, emotional stress, dental procedures, minor surgery under local anesthesia)
- Double the daily hydrocortisone dose to 40 mg (typically 20 mg morning, 10 mg midday, 10 mg evening) 1
- Continue until stress resolves
- Patients already taking prednisone ≥10 mg daily equivalent typically don't need additional coverage 1
- For dental procedures: Extra 10 mg hydrocortisone 1 hour before, then double oral dose for 24 hours 3
Moderate to Major Stress
(Severe illness requiring hospitalization, major trauma, surgery under general/regional anesthesia, labor and delivery, cesarean section)
Parenteral glucocorticoids are mandatory 1:
- Hydrocortisone 100 mg IV bolus at onset
- Followed by continuous IV infusion of 200 mg hydrocortisone over 24 hours 1, 3
- Alternative: Hydrocortisone 50 mg IV/IM every 6 hours if continuous infusion unavailable 3
- Continue parenteral therapy while nil by mouth or until stress resolves
The continuous infusion approach is superior to intermittent bolus dosing because it maintains cortisol concentrations consistently in the physiologic stress range, as demonstrated by pharmacokinetic modeling 4. An initial 50-100 mg bolus before starting the infusion optimizes cortisol levels 4.
Specific Surgical Situations
- Major surgery: 100 mg IV hydrocortisone at induction, then 200 mg/24h continuous infusion postoperatively 3
- Cesarean section: Same as major surgery; transition to double oral dose for 24-48 hours once tolerating oral intake 3
- Labor/vaginal delivery: 100 mg IV at onset of labor, then double oral dose for 24 hours postpartum 3
Gastrointestinal Illness with Vomiting/Diarrhea
Even without hemodynamic instability, consider parenteral glucocorticoids because oral absorption is compromised 1. This prevents progression to adrenal crisis.
Adrenal Crisis Management
If hemodynamic instability, severe vomiting, or suspected adrenal crisis:
- Immediate hydrocortisone 100 mg IV bolus (do not delay for diagnostic testing) 1
- Aggressive fluid resuscitation with 0.9% saline
- Continue hydrocortisone 200 mg/24h continuous IV infusion 1, 3
- Monitor and correct electrolyte abnormalities (hyponatremia, hyperkalemia)
- Identify and treat precipitating cause (infection most common) 5
Critical Pitfalls to Avoid
Do not use intermittent bolus dosing for major stress when continuous infusion is available - the pharmacokinetic data clearly shows intermittent dosing creates peaks and troughs that fail to maintain adequate cortisol levels 4.
Never delay treatment in suspected adrenal crisis - the mortality risk is too high. Treat empirically if clinical suspicion exists, even in patients with unclear glucocorticoid history 1.
Beware of rapid sodium correction when treating undiagnosed adrenal insufficiency with severe hyponatremia - hydrocortisone can cause dramatic vasopressin suppression and risk osmotic demyelination syndrome 6. Monitor sodium closely and use desmopressin/hypotonic fluids if correction exceeds 8-10 mEq/L in 24 hours.
Patients on prednisone ≥10 mg daily may not need additional stress dosing for minor illness because they're already receiving supraphysiologic glucocorticoid doses 1.
Patient Education Essentials
All patients must:
- Carry a steroid emergency card and wear medical alert identification 5
- Know how to self-administer parenteral hydrocortisone for impending crisis 5
- Understand when to double oral doses versus seek emergency care
- Never abruptly discontinue glucocorticoids
The incidence of adrenal crisis remains approximately 8 per 100 patient-years despite optimal management 5, emphasizing that prevention through education and appropriate stress dosing is paramount for reducing the excess mortality associated with adrenal insufficiency.