Utility of the Guy's Stone Score Based on Computed Tomographic Scan Findings for Predicting Percutaneous Nephrolithotomy Outcomes

• Published in: Urology (Ridgewood, N.J.) N.J.), 2014-06, Vol.83 (6), p.1248-1253
• Main Authors: Vicentini, Fabio C, Marchini, Giovanni Scala, Mazzucchi, Eduardo, Claro, Joaquim F.A, Srougi, Miguel
• Format: Article
• Language: English
• Subjects: Adult; Aged; Biological and medical sciences; Cohort Studies; Female; Follow-Up Studies; Humans; Kidney Calculi - classification; Kidney Calculi - diagnostic imaging; Kidney Calculi - surgery; Length of Stay; Male; Medical sciences; Middle Aged; Nephrology. Urinary tract diseases; Nephrostomy, Percutaneous - adverse effects; Nephrostomy, Percutaneous - methods; Operative Time; Postoperative Complications - epidemiology; Postoperative Complications - physiopathology; Predictive Value of Tests; Retrospective Studies; Risk Assessment; Severity of Illness Index; Tomography, X-Ray Computed - methods; Treatment Outcome; Urology
• ISSN: 0090-4295; 1527-9995
• DOI: 10.1016/j.urology.2013.12.041

Objective To evaluate the ability of the Guy's stone score (GS) to predict the success rates and complications on the basis of the computed tomographic (CT) scan findings for renal stones treated with percutaneous nephrolithotomy (PCNL). Methods From 2008 to 2012, a total of 147 consecutive patients (155 renal units) who underwent PCNL in a completely supine position were prospectively evaluated. All patients underwent a CT scan preoperatively, and the stones were classified according to the GS. All PCNLs were analyzed to determine the association between the GS and treatment outcomes on the basis of CT findings and complications, according to the Clavien criteria. Results Of the 155 PCNLs, 27% were classified as GS1, 28.4% as GS2, 27% as GS3, and 17.6% as GS4. Only the largest diameter of the stones differed among the groups (GS1 = 21.4, GS2 = 26.5, GS3 = 31.4, and GS4 = 50.5 mm; P