This multicenter randomized controlled trial plans to enroll primary aldosteronism (PA) patients who meet the following criteria: confirmed unilateral dominant secretion by adrenal vein sampling (AVS), willingness to undergo surgery, and coexisting chronic kidney disease (CKD). Participants will be randomly assigned in a 1:1 ratio to one of two groups. To determine whether short-term postoperative hydrocortisone replacement therapy (intervention group) is superior to conventional management (surgery within 7 days after AVS, control group) in terms of reducing the decline in estimated glomerular filtration rate (eGFR) at 12 months after surgery.