Ability of calculated right adrenal vein aldosterone levels to identify the aldosterone-overproducing side in patients with primary aldosteronism undergoing adrenal venous sampling

BackgroudAdrenal venous sampling (AVS) is a gold standard procedure to determine the dominant side of aldosterone secretion in patients with primary aldosteronism. Unsuccessful cannulation of right adrenal vein (RAV) is a common problem in performing AVS. ObjectiveTo use calculated aldosterone concentration in the RAV (cAldoRAV) for identifying the dominant side of aldosterone secretion. DesignRetrospective study, 2011-2023. MethodsBased on the assumption that cortisol production from both adrenal glands is equal, aldosterone concentration in the RAV was calculated by using the data from left adrenal vein (LAV) and inferior vena cava. The aldosterone concentration in the LAV (AldoLAV) compared to the cAldoRAV (AldoLAV:cAldoRAV ratio) was then used to determine the dominant side of aldosterone secretion in patients with primary aldosteronism. ResultsOf 117 patients with successful AVS, 95 (81.2%) had concordant results between adrenal imaging and AVS study and were used as the gold standard for studying diagnostic performance. The AldoLAV:cAldoRAV ratio with the cutoff values of [≥]3 and [≤]0.33 could identify unilateral diseases (left-sided and right-sided disease, respectively) with 93.8% sensitivity and 100% specificity. In 22 patients who had discordant results between adrenal imaging and standard AVS interpretation, 11 had concordant results when using the AldoLAV:cAldoRAV ratio. ConclusionsThe AldoLAV:cAldoRAV ratio can determine the dominant side of aldosterone secretion with high sensitivity and specificity. It can not only be used for patients with unsuccessful cannulation of RAV but also increase the concordance rate in those who have discordance between adrenal imaging and standard AVS interpretation.