Adrenal Insufficiency After Nephrectomy: Risks and Recovery
Adrenal insufficiency after nephrectomy is possible but not inevitable when one adrenal gland is removed. The contralateral gland typically compensates, but risk factors can precipitate insufficiency.
Physiology & Risk
- Each adrenal gland produces ~50% of cortisol, aldosterone, and androgens
- Contralateral hypertrophy occurs within weeks-months
- Baseline function usually adequate for daily needs
- Stress response may be impaired (surgery, illness, trauma)
Risk Factors for Insufficiency
| Factor | Mechanism |
|---|
| Radical nephrectomy (vs. partial) | Adrenal routinely removed with upper pole tumors |
| Pre-existing adrenal pathology | Subclinical hyperplasia, adenoma, prior hemorrhage |
| Bilateral adrenal disease risk | Metastasis, lymphoma, amyloidosis, TB, APS-1/2 |
| Chronic steroid use | HPA axis suppression; contralateral atrophy |
| Diabetes/Addison's/Cushing's | Direct adrenal dysfunction |
| Advanced age | Reduced functional reserve |
| Critical illness/perioperative stress | Demand exceeds compensatory capacity |
Clinical Presentation
Acute Adrenal Crisis (Emergency)
- Hypotension refractory to fluids
- Severe nausea/vomiting, abdominal pain
- Hypoglycemia, hyponatremia, hyperkalemia
- Fever, confusion, lethargy
- Treat immediately: IV hydrocortisone 100mg + fluids
Chronic Insufficiency
- Fatigue, weakness, weight loss
- Orthostatic hypotension
- Salt craving, hyperpigmentation (primary only)
- Nausea, diarrhea, myalgias
- Menstrual irregularity, loss of libido
Diagnostic Approach
- Morning cortisol: <3 µg/dL = insufficient; >18 µg/dL = adequate
- ACTH stimulation test (250 µg cosyntropin): Peak cortisol <18-20 µg/dL = insufficiency
- Renin/aldosterone: Assess mineralocorticoid axis
- DHEA-S, androgens: If clinically indicated
Management
| Scenario | Glucocorticoid | Mineralocorticoid |
|---|
| Acute crisis | Hydrocortisone 100mg IV q6-8h | Fludrocortisone 0.1mg daily (after volume resuscitation) |
| Chronic primary | Hydrocortisone 15-25mg daily (2/3 AM, 1/3 PM) | Fludrocortisone 0.05-0.2mg daily |
| Chronic secondary | Same glucocorticoid | Not needed (intact renin-angiotensin) |
| Perioperative stress | Stress-dose: 50-100mg IV pre-op, then taper | Continue if on maintenance |
Monitoring
- Clinical: weight, BP (supine/standing), energy, GI symptoms
- Labs: Na/K, glucose, cortisol (if adjusting dose), renin (for fludro titration)
- Bone density: annually (glucocorticoid effect)
- MedicAlert bracelet mandatory
Key Takeaway
Most patients do well with one adrenal gland. Screen high-risk patients pre-op; educate all on stress dosing and crisis recognition. Lifelong replacement only if biochemical insufficiency confirmed.
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