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jes-pa-initial-imaging

This skill recommends computed tomography (CT) as the initial imaging modality for primary aldosteronism (PA) evaluation in Japan, citing its accessibility and comparable performance to MRI. It is triggered when a clinician orders imaging for suspected PA and asks 'What imaging should I start with?' or seeks a cost-effective initial evaluation.

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dromlakhani/MD2SKILL

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Select initial imaging modality for PA evaluation

STEP 1 — Gather Information

Collect confirmed PA diagnosis (positive screening and confirmatory test), assess need for adrenal venous sampling, check serum creatinine/eGFR, pregnancy status, and prior contrast allergy. -> If any absolute contraindication to CT (pregnancy or eGFR <30 mL/min/1.73m2) is found, advance to Step 2; otherwise, proceed to Step 3.

STEP 2 — Rule In / Rule Out

Is there an absolute contraindication to CT (pregnancy or eGFR <30 mL/min/1.73m2)?

Yes: Rule out CT; proceed to evaluate MRI suitability.
No: Rule in CT as feasible initial imaging. -> If CT ruled out, go to Step 3; if CT ruled in, go to Step 4.

STEP 3 — Classify or Stratify

Assess MRI availability and safety (no non-MR compatible implants, avoid gadolinium in pregnancy unless essential). -> If MRI suitable, proceed to order MRI; if MRI not available or contraindicated, consider non-contrast CT with reduced sensitivity and proceed to Step 4.

STEP 4 — Decide

Select the imaging modality: CT if feasible (from Step 2) or MRI if CT contraindicated and MRI suitable (from Step 3); otherwise, use non-contrast CT. -> Order the chosen imaging study and schedule.

Clinical Guardrails / Mimics / Pitfalls

Do not use CT as initial imaging in pregnant patients due to fetal radiation risk; do not omit intravenous saline hydration in CKD stage G4 or higher before contrast CT to mitigate contrast-induced nephropathy; do not rely on MRI if not readily available causing unnecessary delay in AVS planning; do not use non-contrast CT for adenoma detection as sensitivity drops significantly.

Concrete Clinical Example

A 52-year-old man with hypertension, spontaneous hypokalemia, ARR 350, PAC 80 pg/mL, and positive saline infusion test has no pregnancy or severe CKD (eGFR 68 mL/min/1.73m2). He undergoes contrast-enhanced abdominal CT as the initial imaging study, which reveals a 1.2 cm left adrenal nodule, guiding subsequent adrenal venous sampling.

Source: Japan Endocrine Society clinical practice guideline for the diagnosis and management of primary aldosteronism 2021, Japan Endocrine Society, 2022

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