Retrograde endoscopic lithotripsy using the innovative nanosecond electropulse method

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Table 1 Patient distribution according to eligibility criteria

Entry criteria	Kidney/ UPJ (Group I, n = 54)	Ureter (Group II, n = 799)				Bladder (Group III, n = 26)
		Upper/3 (n = 164)	Middle/3 (n = 67)	Lower/3 (n = 568)	Ureter, total (n = 799)
1^st criterion (stone < 6 mm, renal colic, disturbance of urodynamic, no tendency to discharge), n (%)	3/5	68	26	381	475	N/A
	(15%)	(42%)	(39%)	(67%)^⊕	(60%)^⊕	N/A
2^nd criterion (stone ≥ 6 mm, renal colic, disturbance of urodynamic), n (%)	24/15	91	37	163	291	N/A
	(72%)^ΔΔ	(55%)^ΔΔ	(55%)	(29%)^Δ	(36%)	N/A
3^rd criterion (stone of any size, no renal colic, no urodynamic or kidney function disturbance), n (%)	4/3	5	2	17	24	26
	(13%)	(3%)^ΔΔΔ⊕	(3%)	(3%)^ΔΔ	(3%)	(100%)
4^th criterion (“Steinstrasse” following ESWL), n (%)	0	0	2	7	9	N/A
	(0%)	(0%)	(3%)	(1%)	(1%)

Note: ⊕ - p < 0.05 - Significant differences as compared to UPJ concrements; Δ - p < 0.05; ΔΔ - p < 0.01; ΔΔΔ - p < 0.001 - Significant differences as compared to concrements in the middle third of the ureter.