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A Novel Method: Super-selective Adrenal Venous Sampling
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Confirmatory testing in primary aldosteronism.

Kazutaka Nanba1, Tamiko Tamanaha, Kanako Nakao

  • 1Department of Endocrinology, Metabolism, and Hypertension, National Hospital Organization Kyoto Medical Center, 1-1 Mukaihata-cho, Fukakusa, Fushimi-ku, Kyoto 612-8555, Japan.

The Journal of Clinical Endocrinology and Metabolism
|March 16, 2012
PubMed
Summary
This summary is machine-generated.

Confirmatory tests for primary aldosteronism (PA) may not always be necessary. High aldosterone to renin ratio (ARR) or plasma aldosterone concentration (PAC) often predicts positive results on captopril challenge (CCT) and furosemide upright tests (FUT).

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Area of Science:

  • Endocrinology
  • Hypertension Management
  • Diagnostic Accuracy

Background:

  • Primary aldosteronism (PA) diagnosis relies on confirmatory testing.
  • Current guidelines lack consensus on necessity and choice of confirmatory tests for PA.

Purpose of the Study:

  • To evaluate the diagnostic significance of confirmatory tests in primary aldosteronism.
  • To determine if confirmatory testing is universally required after initial PA screening.

Main Methods:

  • 120 hypertensive patients with positive aldosterone to renin ratio (ARR) underwent confirmatory tests (CCT, FUT, SIT).
  • Subgroup analysis included patients undergoing all three tests (Group B) and those with confirmed unilateral/bilateral PA via adrenal venous sampling/imaging/surgery (Group C).

Main Results:

  • Captopril challenge test (CCT) and furosemide upright test (FUT) showed high positive rates (86-96%) across groups.
  • Saline infusion test (SIT) yielded lower positive results compared to CCT and FUT (P < 0.01).
  • Positive test results were more frequent with baseline ARR ≥ 1000 or PAC ≥ 250 pg/mL.

Conclusions:

  • Positive CCT and FUT are common in patients with initial positive PA screening, particularly with high ARR or PAC.
  • Confirmatory testing may not be essential for all patients with positive PA case detection.