Adrenal Venous Sampling in Primary Aldosteronism: Single-Centre Experience from Western India.

Introduction: The protocols and criteria used for adrenal venous sampling (AVS) differ across centres. There are no studies from the Indian subcontinent describing AVS-based outcomes in primary aldosteronism (PA). We aim to describe our experience from a single centre. Methods: Retrospective records from 2018 to 2020 of patients with confirmed PA who underwent AVS were reviewed. Clinical, imaging, AVS data and outcomes (as per PASO criteria) were recorded. AVS was performed by sequential sampling with cosyntropin stimulation with intraprocedural cortisol and cut-off of selectivity >5 and lateralization >4 by a single radiologist. Results: Fifteen patients with median age of 50 years (41-58) and duration of hypertension of 156 (36-204) months were included. Ten had grade 3 hypertension, 13 had hypokalaemia and 3 had hypokalaemic paralysis. On CT scan, eight patients had bilateral adrenal lesions, four had unilateral adenoma and three patients had normal adrenals. AVS was bilaterally successful in all and showed lateralization of disease in 10 patients and was bilateral in the remaining 5 patients. Overall concordance of CT and AVS was 5/15 (33.3%). Among seven patients who underwent surgery, complete clinical success was seen in two and partial clinical success in the remaining five. Complete biochemical success was seen in two and partial in one. There were no major complications. Conclusions: AVS performed by a single radiologist with defined protocols has a good success rate. AVS has additional value over CT scan in lateralization, especially when CT shows bilateral disease.