Factors and nomograms determining the effectiveness of extracorporeal shock wave lithotripsy in children with urolithiasis: a literature review

Abstract

Extracorporeal shock wave lithotripsy (ESWL) is currently the priority method for treating urolithiasis in children. Due to the lack of extended indications for the application of this technique, an active search has been made over the past 30 years to define factors predicting ESWL outcome, to create objective preoperative planning tools, to increase ESWL effectiveness and to reduce the number of anesthetics and unnecessary surgical interventions.

Search for the information on predictive factors of ESWL successful intervention and on modern statistical tools predicting lithotripsy effectiveness in children with urolithiasis was made in foreign and domestic sources, like MEDLINE, eLIBRARY, CyberLeninka.

The literature analysis has showed that the following factors predispose positive ESWL outcomes: age before six years, smaller calculi size, and shorter skin-to-stone distance. Stone location in the lower calyx group, multiple concrements, and their high density has a negative impact at complete fragment detachment after ESWL. The probability of complete detachment of stone fragments from the lower calyx group decreases under the following anatomic features of kidney collecting system: number of draining calyces is more than one, calyx neck diameter is less than 4 mm, acute angle between the lower infundibulum and renal pelvis. Body mass index and prestenting have a controversial effect at successful ESWL too.

Nomograms and scoring systems based on predicting factors are widely used in both adult and pediatric practice. The two most commonly used nomograms in pediatric urology are Onal and Dogan nomograms developed in 2012 and 2015 in Turkey. These nomograms include the following parameters: patient's sex and age, history of ipsilateral surgical interventions as well as stone localization, number and size.

Thus, predicting ESWL outcomes using preoperative planning allows to choose the most appropriate treatment modality for a particular patient considering his/her individual anatomical and physiological characteristics and characteristics of the calculi.

Keywords

pediatric surgery / pediatric urology / urolithiasis / ESWL (Extracorporeal Shockwave Lithotripsy) / nomogram / review

References

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