RIRS with Vacuum-Assisted Ureteral Access Sheath versus MPCNL for the Treatment of 2-4 cm Renal Stone

Table 1

Demographic data of patients.

Variable	Group A (RIRS)	Group B (MPCNL)	value
	28 patients	56 patients
Age (year), mean (SD), range	45.2 (10.4), 21-65	49.6 (12.2), 23-72	0.296
Gender (males/females)	16/12	26/30	0.355
BMI (kg/m^2), mean (SD), range	24.98 (3.51), 19-32	25.32 (4.12), 20-33	0.104
Stone-affected side (left/right)	13/15	30/26	0.537
Grade of hydronephrosis (no.)			0.061
None	16	20
Mild	12	36
Charlson comorbidity index			0.864
0 (%)	13	24
1 (%)	10	18
2 (%)	3	10
3 (%)	2	4
Renal stone location, no. (%)			0.562
Renal pelvic+upper pole	7	17
Renal pelvic+middle pole	4	12
Renal pelvic+lower pole	6	11
Renal pelvic+middle pole+lower pole	5	11
Renal pelvic+upper pole+middle pole	6	5
Largest stone size (mm), mean (SD), range	35.3 (6.3), 25-39	38.2 (5.4), 28-40	0.074
Renal stone burden (mm^2), mean (SD), range	676.1 (42.2), 391.2-803.4	729 (83.7), 412.3-843.2	0.089
Stone density (HU), mean (SD), range	894.3 (232.3), 650-1103	845.2 (240.2), 600-1206	0.43
Positive urine culture, no. (%)	8 (28.6%)	21 (37.5%)	0.417