Preoperative Preparation for Conn's Syndrome (Primary Aldosteronism)
Administer spironolactone for several weeks before surgery to control hypertension and hypokalemia, and to prevent postoperative hypoaldosteronism. 1
Core Preoperative Management
Mineralocorticoid Receptor Antagonist (MRA) Therapy
Start spironolactone weeks before surgery to achieve three critical goals 1:
- Control blood pressure to target <140/90 mmHg 2
- Correct hypokalemia and normalize serum potassium
- Stimulate the contralateral adrenal gland to reduce risk of postoperative functional mineralocorticoid insufficiency
The 2016 French consensus guidelines explicitly state that spironolactone administration during the weeks preceding surgery controls hypertension and hypokalemia, and may prevent postoperative hypoaldosteronism 1. This represents strong evidence with grade + recommendation 1.
Alternative MRA Options
If spironolactone causes intolerable side effects (gynecomastia, sexual dysfunction in men; menstrual irregularities in women), consider eplerenone as an alternative 3. Eplerenone has greater mineralocorticoid receptor specificity and fewer side effects, though it requires higher doses for equivalent antihypertensive effect 3.
Potassium Management
Supplement potassium if hypokalemia persists despite MRA therapy 1. Without potassium supplementation, serum potassium drops by 0.5-1 mmol/L during adrenalectomy 1. Normalize potassium levels before surgery to prevent intraoperative complications.
Blood Pressure Optimization
Expect systolic blood pressure to increase by 20-30 mmHg above baseline during laparoscopic adrenalectomy, requiring antihypertensive treatment in 45% of cases 1. Ensure adequate preoperative blood pressure control with MRAs and additional antihypertensives as needed.
Preoperative Endocrinology Consultation
Schedule a dedicated preoperative endocrinology visit to address 2:
- Expected surgical outcomes and realistic expectations (only ~40% achieve complete hypertension cure) 1
- Anticipated postoperative decline in renal function
- Evaluation for cortisol co-secretion
- Assessment of postoperative adrenal insufficiency risk
Surgical Planning
Refer to an experienced surgeon in a reference center for laparoscopic adrenalectomy 1. Perioperative mortality is <0.5% and severe complications <2% in specialized centers, but complication rates increase significantly outside reference centers 1.
Critical Perioperative Timing
Discontinue MRAs and potassium supplementation at the time of surgery to prevent postoperative hyperkalemia from functional mineralocorticoid insufficiency, which occurs in 15-30% of patients despite preoperative spironolactone 1. Also discontinue low-salt diet and non-essential antihypertensives to reduce risk of hypotension 1.
Common Pitfalls to Avoid
- Do not skip preoperative MRA therapy: The most recent 2026 research emphasizes that preoperative MRA optimization is essential for both immediate perioperative safety and contralateral adrenal recovery 2
- Do not continue MRAs through surgery: This causes postoperative hyperkalemia requiring fludrocortisone in up to 5% of cases 1
- Do not assume all patients need prolonged preparation: Only ~10% require extended preoperative preparation 4, but those with severe hypertension or profound hypokalemia need more aggressive optimization
- Do not overlook risk factors for persistent hypoaldosteronism: Age >50 years, hypertension duration >10 years, pre-existing renal impairment, and adenoma size >2 cm increase risk 5
Evidence Quality Note
The 2016 French consensus guidelines 1 provide the most specific preoperative recommendations with strong evidence ratings. The 2025 Endocrine Society guideline 3 focuses more on surgical versus medical treatment decisions rather than perioperative details. The 2026 practical approach article 2 offers the most contemporary synthesis but represents expert opinion rather than formal guideline recommendations.