Utility of ultrasound-based scoring system in post-pyeloplasty recovery
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In brief
In brief
This retrospective study validates a pyeloplasty prediction score (PPS) using three ultrasound parameters to distinguish ureteropelvic junction obstruction requiring surgery from non-obstructive dilatation in children with antenatal hydronephrosis. A PPS cutoff above 8 demonstrated 95% sensitivity and 100% specificity for predicting surgical need, and also tracked post-operative recovery.
- Pyeloplasty prediction score (PPS) >8 predicts need for surgery with 95% sensitivity and 100% specificity in antenatal hydronephrosis.
- PPS combines three ultrasound parameters: SFU grade, transverse APD, and percentage difference in ipsilateral vs contralateral renal length.
- All patients with PPS >8 required pyeloplasty; only 2 patients with PPS=7 needed surgery due to declining renal function.
- Post-operative PPS resolution correlates with follow-up duration, making it useful for tracking surgical recovery after pyeloplasty.
- PPS limitation: requires a normal contralateral kidney for comparison; cannot be applied in bilateral disease or solitary kidney cases.
Written by the GCMD Library team from the article.
Abstract
Background/Objective
Differentiation of uretero-pelvic junction obstruction (UPJO) from non-obstructive dilatation (NOD) is a major challenge. The aim of this retrospective study is to determine whether pyeloplasty prediction score (PPS) could predict the need for surgery and resolution after surgery.
Methods
Among patients with antenatally diagnosed hydronephrosis, those who were stable during post-natal follow-up were considered NOD. The UPJO group were the ones who worsened and underwent pyeloplasty based on conventional indications. All patients with UPJO underwent laparoscopic dismembered pyeloplasty. PPS was determined based on three ultrasound parameters obtained retrospectively: Society of Fetal Urology (SFU) grade of hydronephrosis, transverse anteroposterior (APD), and the absolute percentage difference of ipsilateral and contralateral renal lengths.
Results
Among 137 patients included (R:L = 59:73; M:F 102:35), 96 were conservatively managed (NOD), while 41 patients (29%) needed pyeloplasty (UPJO). Mean PPS was 4.2 (1.2) in the NOD group and it was significantly higher at 10.8 (1.63) in the UPJO group (p = 0.001). All patients with PPS > 8 needed a pyeloplasty, while two patients with PPS of 7 needed pyeloplasty due to drop in renal function. PPS cutoff value of >8 had a sensitivity 95%, specificity 100% and a likelihood ratio of 20. Post-pyeloplasty PPS resolution was proportional to the duration of follow-up.
Conclusions
A PPS cutoff value of 8 or above is associated with the presence of significant UPJO. PPS is also useful in the assessment of hydronephrosis recovery post-pyeloplasty. The limitation of PPS: it can only be applied in the presence of contralateral normal kidney.