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Zorluk: ZorDiagnostic Workup and Test Sequencing

A 48-year-old man comes to the clinic for follow-up of treatment-resistant hypertension. His blood pressure remains 168/98 mmHg despite adherence to maximum doses of amlodipine, lisinopril, and hydrochlorothiazide. Laboratory studies two weeks ago showed a serum potassium of 3.1 mEq/L. Subsequent evaluation revealed a plasma aldosterone concentration (PAC) of 34 ng/dL and a suppressed plasma renin activity (PRA) of 0.4 ng/mL/h. A confirmatory intravenous saline infusion test demonstrated persistent elevation of aldosterone levels, confirming the diagnosis of primary aldosteronism. An abdominal computed tomography (CT) scan shows a 1.4-cm, lipid-rich adenoma in the right adrenal gland and a morphologically normal left adrenal gland. The patient is a good surgical candidate and expresses a strong desire for a definitive surgical cure. Which of the following is the most appropriate next step in management?

  1. Adrenal venous samplingCevap
  2. B
    Right unilateral laparoscopic adrenalectomy
  3. C
    Magnetic resonance imaging of the abdomen
  4. D
    Initiation of spironolactone therapy
  5. E
    Dexamethasone suppression test

Cevap

Adrenal venous sampling is the most appropriate next step to functionally confirm lateralization of aldosterone hypersecretion prior to considering surgery.
In the diagnostic workup of primary aldosteronism, identifying the functional source of aldosterone hypersecretion is critical before surgical intervention. While a CT scan may show a unilateral nodule, nonfunctioning adrenal adenomas (incidentalomas) are increasingly common with advancing age. Therefore, in patients older than 35 years, cross-sectional imaging alone has a high false-positive rate for identifying the active source. Adrenal venous sampling is the most accurate test to differentiate a unilateral aldosterone-producing adenoma from bilateral idiopathic adrenal hyperplasia. It must be performed in this 48-year-old patient to functionally confirm that the right-sided adenoma is actively hypersecreting aldosterone before pursuing a unilateral adrenalectomy. If the patient were strictly under 35 years old with marked aldosteronism and a clear unilateral adenoma, surgery without this step might be considered.

Adım Adım Çözüm

1
Identify the confirmed diagnosis and clinical scenario.
The patient has biochemically confirmed primary aldosteronism and is seeking surgical management.
This establishes that the patient has completed the initial screening and confirmation phases of the diagnostic algorithm.
2
Evaluate the imaging findings in the context of the patient's demographics.
The patient is 48 years old with a 1.4-cm right adrenal nodule on CT.
Age is a critical variable; patients >35 years have a high background prevalence of nonfunctioning adrenal incidentalomas.
3
Determine the necessary sequencing step before irreversible surgical intervention.
Adrenal venous sampling must be performed.
Because the nodule could be an incidentaloma with contralateral or bilateral hyperplasia causing the excess aldosterone, functional lateralization is mandatory before adrenalectomy.

Anahtar Kavram

In patients older than 35 years with primary aldosteronism who are candidates for surgery, adrenal venous sampling is required to distinguish between unilateral aldosterone-producing adenomas and bilateral hyperplasia, even if cross-sectional imaging shows a unilateral nodule.
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Diagnostic Workup and Test Sequencing

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