Risk factors influencing the recurrence of obstruction post-pediatric pyeloplasty: a single-center prospective study

Figures & data

Table 1. Demographic data of the studied patients.

	Frequency	%
Age:
0–6 months	39	31.0%
>6 months	87	79.0%
Median in months (Min-Max)	17 (2–192)
Gender:
Male	93	73.8%
Female	33	26.2%
Affected side:
Right side	41	32.5%
Left side	73	58%
Bilateral	12	9.5%
Mode of presentation
Antenatal hydronephrosis	84	66.7%
UTI	13	10.3%
Pain	12	9.5%
Swelling	10	7.9%
Accidental discovery	6	4.8%
Hematuria	1	0.8%

Table 2. Analysis of risk factors that may lead to recurrence.

	Success(n = 117)		Failure(n = 9)		Sig.
Age:					^MCp 0.058
0–6 months	39	33.3%	1	11.1%
>6 months	78	66.7%	8	88.9%
Gender
Male	86	73.5%	7	77.8%	^FEp1
Female	31	26.5%	2	22.2%
Mode of presentation
Antenatal hydronephrosis	79	67.5%	5	55.6%
Accidental discovery	5	4.3%	1	11.1%
Swelling	9	7.7%	1	11.1%	^MCp.942
UTI	12	10.3%	1	11.1%
Pain	11	9.4%	1	11.1%
Hematuria	1	0.8%	0	0.0%
Laterality
Right side	40	34.2%	1	11.1%
Left side	65	55.6%	8	88.9%
Bilateral	12	10.3%	0	0.0%	^MCp.543
Preoperative Hydro grade
GIII	6	5.1%	1	11.1%
GIV	111	94.9%	8	88.9%	^FEp.413
Duplex Kidney:
Normal Kidney	115	98.3%	8	88.9%	^FEp.201
Duplex	2	1.7%	1	11.1%
Pelvic Kidney
No	114	97.4%	9	100.0%	^FEp1
Yes	3	2.6%	0	0.0%
Horseshoe kidney
No	115	98.3%	8	88.8%	^FEp.201
Yes	2	1.7%	1	11.2%
Debris in the renal pelvis
yes	6	5.1%	0	0.0%	^FEp1
No	111	94.9%	9	100.0%
Malrotation
No	98	83.8%	7	77.8%	^FEp.644
Yes	19	16.2%	2	22.2%
Giant Hydronephrosis
No	107	91.5%	8	88.9%	^FEp.529
Yes	10	8.5%	1	11.1%
Post-operative fever
No	103	88.0%	7	77.8%	^FEp.320
Yes	14	12%	2	22.2
Post-operative prolonged excessive urinary leak
No	114	97.4%	6	66.7%	^FEp.005*
Yes	3	2.6%	3	33.3%

^MCp: MonteCarlo significance, ^FEp: FischerExact significance, *Significant results ≤ .05.

Table 3. Demonstrates that prolonged excessive postoperative urinary drainage was a significant risk factor for recurrence following pediatric pyeloplasty. Recurrence occurred in 50% of cases with prolonged leakage compared to only 5% of cases without prolonged drainage.

Post-operative prolonged excessive urinary leak		Success	Failure	Total	^FEp.005*
No	Count	114	6	120
	%	95.0%	5.0%	100%
Yes	Count	3	3	6
	%	50.0%	50.0%	100.0%
Total	Count	117	9	126
	%	92.9%	7.1%	100.0%

^FEp: FischerExact significance, *Significant results ≤ .05.