Supine <em>versus</em> Prone Miniaturised Percutaneous Nephrolithotomy in Elderly Patients.

To compare the outcomes of mini-PCNL (miniaturised percutaneous nephrolithotomy) in prone and supine positions in elderly patients. Cohort study. Department of Urology, University of Health Sciences, Turkey, between April 2017 and January 2021. Patients over 65 years of age were included in the study. All patients' comorbidities were recorded and charlson comorbidity index (CCI) score was calculated. The groups were compared in terms of perioperative values, stone-free rates and complication rates. Logistic regression analysis was used to evaluate risk factors for complication development. Postoperative complications were noted according to the Clavien scoring system (CSS). There were 54 patients in the supine mini-PCNL group and 64 in the prone mini-PCNL group. The median ages were 67 in the prone and 66 in the supine group. CCI scores were similar in both groups (p = 0.735). Stone-free and total complication rates were not statistically different in the groups (p = 0.994 and p = 0.247, respectively). However, grade 1-2 complication rates were significantly higher in the prone group (p=0.020). CCI score and stone size were significantly associated with the development of complications (p = 0.018 and p = 0.034, respectively). The present study is the first to compare the outcomes of mini-PCNL in prone and supine position in geriatric patients. Supine mini-PCNL is a potentially safer alternative treatment method for older patients with high CCI scores. Key Words: Percutaneous nephrolithotomy, Supine position, Elderly, Mini-PCNl, CCI score.