Stress-Dose Glucocorticoid Regimen for Gastroscopy and Colonoscopy in Addison Disease
For patients with Addison disease undergoing gastroscopy or colonoscopy under general or regional anesthesia, administer hydrocortisone 100 mg intravenously at induction, followed by double the usual oral hydrocortisone dose for 24 hours postoperatively, then return to maintenance dosing. 1
Procedural Classification and Dosing Algorithm
The 2020 UK guidelines from the Association of Anaesthetists, Royal College of Physicians, and Society for Endocrinology provide clear stratification based on whether general anesthesia is required 1:
If General or Regional Anesthesia is Used (Most Common for Colonoscopy):
Intra-operative:
- Hydrocortisone 100 mg IV at induction of anesthesia 1
Postoperative:
- Once stable and able to take oral medications: double the usual oral hydrocortisone dose for 24 hours 1
- For a patient on 15-20 mg daily (typically split as 10-5-5 mg or similar), this means 30-40 mg daily (e.g., 20-10-10 mg) for 24 hours
- Return to normal maintenance dose after 24 hours 1
If Conscious Sedation Only (Some Gastroscopies):
Pre-procedure:
- Double the morning hydrocortisone dose given pre-operatively 1
Post-procedure:
- Return to normal maintenance dose 1
Critical Rationale and Evidence Quality
The guidelines explicitly classify these as minor procedures requiring general anesthesia rather than major surgery 1. This distinction is crucial because it avoids the excessive stress-dosing (100 mg bolus followed by 200 mg/24h continuous infusion) reserved for major surgery 1.
The evidence base acknowledges that while direct research is limited, the risk-benefit analysis strongly favors supplementation. The 2012 Cochrane review was withdrawn due to poor evidence quality, but the consensus among endocrinology and anesthesia experts prioritizes patient safety given the 8.3 per 100 patient-years incidence of adrenal crisis and associated mortality risk 1.
Common Pitfalls to Avoid
Do not under-dose: Even "minor" procedures under anesthesia represent physiological stress that patients with Addison disease cannot mount an endogenous cortisol response to. Approximately 8.6% of adrenal crises occur due to insufficient peri-operative glucocorticoid coverage 1.
Do not over-treat: Prolonged high-dose glucocorticoids (beyond 24-48 hours for uncomplicated procedures) increases risks of hypernatremia, infection, and metabolic complications 1. These are diagnostic procedures with minimal tissue trauma—not major abdominal surgery.
Ensure IV access: The 100 mg IV bolus at induction is the preferred route because it guarantees delivery during the critical stress period 1, 2. Intramuscular administration is acceptable only if IV access is impractical 1.
Patient education matters: Patients with long-standing Addison disease are often well-informed and may advocate for their needs. Listen to their experience with previous procedures, but follow evidence-based protocols 1.
Mineralocorticoid Considerations
For primary adrenal insufficiency (Addison disease), continue fludrocortisone at the usual dose throughout the peri-operative period once oral intake resumes 1. The 100 mg hydrocortisone bolus provides sufficient mineralocorticoid activity during the brief procedure, but fludrocortisone should not be withheld long-term as it lacks the mineralocorticoid potency needed for chronic replacement 1.
Monitoring and Recovery
Patients should be monitored for signs of adrenal insufficiency (hypotension, nausea, confusion) during recovery. Blood glucose monitoring is less critical in adults than children, but hypoglycemia can occur 1. Most patients can be discharged the same day once stable on oral doubled doses, with clear instructions to return to maintenance dosing after 24 hours.
The FDA labeling supports the 100 mg IV bolus approach, noting that initial emergency dosing ranges from 100-500 mg depending on severity, with the lower end appropriate for planned procedures 2.