Alterações da função vesical devido ao envelhecimento em mulheres avaliadas através do estudo urodinâmico

Purposes: The bladder function declines with age and can lead to impaired quality of life and serious health problems in the elderly. The aim of the study is to evaluate changes in bladder function with aging in women by urodynamic study and try to develop equations that can estimate the expected values of the urodynamic parameters evaluated according to the age. Methods: A retrospective analysis of urodynamic studies in the Urology Service of the Department of Surgery - Hospital das Clinicas, Federal University of Pernambuco, recorded in the electronic medical database www.infomed.net.br among May 2011 and November 2015 was performed in order to obtain and calculate the parameters necessary to evaluate bladder function in different age groups (18-30, 31-40, 41-50, 51-60, 61-70, 71-80 and above 80 years). Patients with any factor that had the potential to affect bladder function were excluded. Results: 3103 urodynamics studies were analyzed and 719 female patients were selected. The average age of patients was 49.3 years and in all evaluated parameters (maximum flow, volume of urination, bladder compliance, maximum cystometric capacity, detrusor pressure at maximum flow, post-void residual urine volume, bladder contractility index and bladder voiding efficiency) statistically significant correlation between the decline of bladder function and age were obtained. Also we presented mathematical equations with cause-effect relationship by linear regression. Conclusion: The present study showed that there is a decrease in the bladder storage function (reduction in maximum cystometric capacity and bladder compliance) and in the bladder emptying function (reduction of the maximum flow, detrusor pressure at maximum flow, volume of the urination, contractility index urinary bladder and bladder voiding efficiency , as well increased post-void residual urine volume) with aging. Analyzing data let us to propose equations that can estimate the expected values of the urodynamic parameters evaluated according to the age in the studied population.