MP08-03 PREDICTING URETERIC STONE EXPULSION WITH PATIENT REPORTED OUTCOMES: A PROSPECTIVE OBSERVATIONAL STUDY

INTRODUCTION AND OBJECTIVES:Many outcome-based studies have utilized patient reported accounts to establish stone passage rates, however little data exists regarding the accuracy of such assessments. We sought to prospectively quantify the accuracy of patient reported variables on true ureteric stone expulsion rates.METHODS:New patients presenting to the University of Alberta stone clinic were prospectively surveyed between April 2016 and November 2017. Current patient symptoms and an assessment of whether or not they believed they had passed their stone were assessed. Exclusion criteria included non-ureteric stones, sepsis, prior ureteric stent or operative intervention for the current stone episode. The primary outcome was radiographic stone passage as confirmed by ultrasound with KUB, CT scan, or ureteroscopy. Radiographic stone passage was compared to patient survey responses to calculate sensitivity and specificity.RESULTS:136 patients met inclusion criteria with an average follow-up of 16.9±8.0 days...