FRI185 Post-adrenalectomy Improvement Of Kidney Function In Patients With Mild Autonomous Cortisol Secretion And Nonfunctioning Adrenal Adenoma

Disclosure: L. Rahimi: None. A. Kittithaworn: None. R. Gregg Garcia: None. J. Saini: None. P. Dogra: None. E. Atkinson: None. S. Achenbach: None. A. Kattah: None. I. Bancos: None. Objective: Patients with mild autonomous cortisol secretion (MACS) have been reported to have a higher prevalence of chronic kidney disease (CKD), possibly due to the direct effect of hypercortisolism on kidney function and indirect effect of MACS-associated cardiovascular comorbidities, such as diabetes, hypertension, obesity, and dyslipidemia. Limited studies suggest improvement of kidney function following adrenalectomy in patients with MACS. In this study, we aimed to assess the factors associated and the degree and timing of change in kidney function post adrenalectomy in patients with MACS or nonfunctioning adrenal adenoma (NFA). Methods: We conducted a retrospective single-center study and included adult patients with MACS or NFA diagnosed based on a post-dexamethasone cortisol cutoff of 1.8 mcg/dL, who underwent adrenalectomy between 1999-2022. The change in estimated glomerular filtration rate (eGFR) before and up to 3.5 years after adrenalectomy was defined as the primary outcome. Demographics and comorbidities were included in univariable and multivariable analyses. Results: We included 155 (76.0%) patients with MACS and 49 (24.0%) patients with NFA treated with adrenalectomy. The proportion of women was high in both MACS and NFA (71.6% vs 69.4%, p=0.77), however, patients with MACS were older (median age 59.2 vs 54.6 years in NFA, p=0.05). The prevalence of hypertension was higher in MACS vs NFA (71.0% vs 53.1%, p=0.02), while the prevalence of diabetes (25.2% vs 28.6%, p=0.89), dyslipidemia (47.7% vs 46.9%, p=0.92), smoking (74.2% vs 68.9%, p=0.49) and obesity (median BMI 30.4 vs 31.8 kg/m(2,) p=0.35) was similar between the two groups. Prior to adrenalectomy, patients with MACS had lower eGFR (median 84.4 vs 89.2 ml/min/1.73m(2), p=0.09) and a higher prevalence of CKD stage ≥ 3 (16.1% vs 8.2%, p= 0.16). In patients with MACS, after an initial decline of eGFR within 6 months post adrenalectomy (mean decrease 5.3 ml/min/1.73m(2)), eGFR increased by a mean of 4.9 points at 18-30 months, and by a mean of 8.1 points at 30-42 months post-adrenalectomy (p<0.01). Patients with NFA followed a similar eGFR change trend (p=NS). When comparing post-adrenalectomy delta eGFR in patients with MACS vs NFA, no significant differences were found. After adjusting for age, sex, pre-adrenalectomy eGFR, patient group, hypertension, antihypertensive therapy, and diabetes, there were still significant changes in eGFR over time. In a multivariable analysis, younger age (est -031, p<0.001) and lower pre-adrenalectomy eGFR (est-0.27, p=0.001) were associated with kidney function improvement post-adrenalectomy. Conclusion: Patients with MACS and NFA demonstrate improvement of eGFR over the 3.5 years of follow up post-adrenalectomy. The factors that are associated with improvement of eGFR are lower eGFR before surgery, younger age at time of adrenalectomy and longer follow up post adrenalectomy. Presentation: Friday, June 16, 2023