Comparison of Catecholamine Concentrations in Venous Blood During Selective Adrenal Artery Embolization

This study is measuring hormone levels (specifically catecholamines) in blood taken from the adrenal vein during a minimally invasive procedure called selective adrenal artery embolization. It is aimed at improving how doctors treat primary aldosteronism — a condition where the adrenal glands produce too much of a hormone that raises blood pressure. **You may be eligible if...** - You are 18 or older with a confirmed diagnosis of primary aldosteronism (a hormonal cause of high blood pressure) - Your blood pressure remains high (140/90 mmHg or above in clinic, or above certain thresholds on 24-hour monitoring) - Your adrenal CT scan shows changes consistent with aldosteronism - You have had high blood pressure for more than 6 months **You may NOT be eligible if...** - You have not completed the required diagnostic workup for primary aldosteronism - You have severe kidney or liver disease - You are pregnant - You cannot give informed consent Talk to your doctor to see if this trial is right for you.