Figure 48

Localizing tests for primary aldosteronism. Adrenal venous blood sampling with determination of both aldosterone and Cortisol concentrations during adrenocorticotropic hormone stimulation provides the most accurate way to identify unilateral hyperaldos-teronism. This approach minimizes artefact owing to episodic steroid secretion and to permit correction for dilution of adrenal venous blood with comparison of values to those in the inferior vena cava. (see Fig. 4-12). (Data from Weinberger and coworkers [3].)

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