THE GUY'S STONE SCORE: A VERY PRACTICAL AND USEFUL TOOL TO PREDICT THE OUTCOMES OF PERCUTANEOUS NEPHROLITHOTOMY (PCNL)

Abstract

OBJECTIVE: To evaluate the applicability of the Guy’s stone score for complete supine PCNL. METHODS: 117 patients that underwent to complete supine PCNL were classified according the Guy’s stone score. The data were prospectively collected but the classification according to the score was done by review of the pre-operative CT scans. All patients were operated by the same surgeon and had a pre and post operative CT scan and at the final followup. The outcomes and complications were compared among the 4 groups. RESULTS: The table 1 shows the demographic and outcomes. The groups were similar except for the median stone diameter. The differences among groups were statistically different after stratification according to the Guy’s stone score in relation to operative time, hemoglobin drop, transfusions, complications, tubeless rate, immediate success, auxiliary procedures, PCNL revisions and final success rate. CONCLUSIONS: The Guy’s stone score showed to be a very practical and useful tool to predict the outcomes of PCNL.