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Zorluk: ZorEndocrinology and Metabolism

A 42-year-old woman is evaluated for poorly controlled blood pressure despite adherence to a three-drug antihypertensive regimen consisting of amlodipine, lisinopril, and chlorthalidone. Her blood pressure is 162/98 mm Hg, and laboratory studies reveal a serum potassium level of 3.1 mEq/L. Primary hyperaldosteronism is suspected. She is an appropriate surgical candidate and wishes to pursue a definitive surgical cure if eligible. Assuming each test in the diagnostic pathway yields results consistent with a surgically correctable unilateral aldosterone-producing adenoma, arrange the following steps in the correct chronological order for her diagnostic workup and management.

  1. 1Measure plasma aldosterone concentration and plasma renin activity
  2. 2Perform an intravenous normal saline infusion test
  3. 3Obtain a dedicated computed tomography scan of the adrenal glands
  4. 4Perform bilateral adrenal venous sampling
  5. 5Proceed with unilateral laparoscopic adrenalectomy

Cevap

The correct chronological sequence is: initial biochemical screening with aldosterone-to-renin ratio, followed by confirmatory testing with saline infusion, initial anatomic localization with adrenal computed tomography, functional lateralization with bilateral adrenal venous sampling, and definitive surgical treatment with unilateral adrenalectomy.
The evaluation of primary hyperaldosteronism strictly follows a stepwise progression to avoid unnecessary and incorrect surgeries. First, screening is done with a plasma aldosterone-to-renin ratio. If elevated, the diagnosis must be biochemically confirmed by demonstrating autonomous secretion (e.g., oral sodium loading or IV saline infusion test). Once biochemically confirmed, an adrenal CT is obtained to rule out large carcinomas and assess venous anatomy. Crucially, because patients over age 35 frequently have benign, non-functioning adrenal nodules (incidentalomas), a CT scan alone cannot determine if a visible nodule is actively secreting aldosterone. Therefore, bilateral adrenal venous sampling is mandatory to prove functional lateralization. Only after AVS confirms that the excess aldosterone is coming from one specific gland is unilateral adrenalectomy indicated.

Adım Adım Çözüm

1
Perform screening with plasma aldosterone concentration (PAC) and plasma renin activity (PRA).
Establishes an elevated PAC/PRA ratio.
The initial step in evaluating suspected primary hyperaldosteronism (e.g., resistant hypertension with hypokalemia) is always a biochemical screening.
2
Administer a confirmatory suppression test, such as an intravenous normal saline infusion.
Demonstrates failure to suppress aldosterone levels.
An elevated screening ratio can be a false positive; true primary aldosteronism requires proof of autonomous, non-suppressible aldosterone production.
3
Obtain an adrenal computed tomography (CT) scan.
Provides initial anatomic localization (e.g., a unilateral nodule) and rules out large, suspicious masses suggestive of adrenocortical carcinoma.
Imaging is indicated only after biochemical diagnosis is confirmed, establishing the anatomical layout for the next interventional step.
4
Perform bilateral adrenal venous sampling (AVS).
Confirms lateralization of aldosterone hypersecretion to the side of the nodule seen on imaging.
In patients aged 35 and older, non-functioning adrenal incidentalomas are highly prevalent. A nodule seen on CT might not be the source of excess aldosterone (the true cause could be bilateral hyperplasia). AVS is mandatory to prove functional lateralization before organ removal.
5
Perform unilateral laparoscopic adrenalectomy.
Surgical removal of the hypersecreting gland.
This is the definitive, curative management for a functionally confirmed unilateral aldosterone-producing adenoma.

Anahtar Kavram

The diagnostic and management algorithm for primary hyperaldosteronism requires sequential biochemical screening, biochemical confirmation, anatomical localization, functional lateralization, and specific therapy.
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Endocrinology and Metabolism

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