STONE_Nephrolithometry_Score_for_Renal_Calculi_guideline v.1
STONE Nephrolithometry Score for Renal Calculi assist clinicians to predict recurrence of kidney stone based on radiological criteria.
To assist clinicians to predict treatment success and the risk of perioperative complications after percutaneous nephrolithotomy based on reproducible, standardized parameters obtained from computed tomography imaging.
Use for preoperative patient counseling, surgical planning, and evaluation of surgical outcomes across institutions and within medical studies. Variables: - Stone size in mm² (Length × width in mm): 0-399=1, 400-799=2, 800-1599=3, >=1600=4 - Tract length (mm) (Distance from center of stone to the skin measured on CT film at 0°, 45°, and 90°): ≤100=1, >100=2 - Obstruction (hydronephrosis): No/mild hydronephrosis=1, Moderate/severe hydronephrosis=2 - Number of calyces with calculi: 1=1, 2-3=2, >3=3 -Essence (stone density in Hounsfield units): ≤950=1, >950=2 STONE score formula: Addition of selected points. Interpretations: STONE Score 5= 94% chance of patient being stone free after first procedure. STONE Score 6= 88% chance of patient being stone free after first procedure. STONE Score 7= 92% chance of patient being stone free after first procedure. STONE Score 8= 83% chance of patient being stone free after first procedure. STONE Score 9= 64% chance of patient being stone free after first procedure. STONE Score 10= 42% chance of patient being stone free after first procedure. STONE Score >=11 = 27% chance of patient being stone free after first procedure.
Not to use in patients with ureteral stones.
1. Okhunov Z, Friedlander JI, George AK, Duty BD, Moreira DM, Srinivasan AK, Hillelsohn J, Smith AD, Okeke Z. S.T.O.N.E. Nephrolithometry: Novel Surgical Classification System for Kidney Calculi, Urology, Volume 81, Issue 6, June 2013, Pages 1154-1160, ISSN 0090-4295, http://dx.doi.org/10.1016/j.urology.2012.10.083. 2. Akhavein A, Henriksen C, Syed J, Bird VG. Prediction of single procedure success rate using S.T.O.N.E. nephrolithometry surgical classification system with strict criteria for surgical outcome. Urology. 2015 Jan;85(1):69-73. doi: 10.1016/j.urology.2014.09.010.
OBSERVATION.stone_nephrolithometry_score_for_renal_calculi.v0
