Solo Sonographically Guided PCNL under Spinal Anesthesia: Defining Predictors of Success

Table 2

Data of patients regarding their residual stone status in early postoperative imaging, excluding eight failed operations.

	Significant residue				value
	No (105)		Yes (26)
Age (years)	50 ± 14		41 ± 12		0.002^∗
BMI (Kg/m)	27 ± 4		27 ± 5		0.67
Gender
Male	64	80.0%	16	20.0%	0.95
Female	41	80.4%	10	19.6%
History of open surgery
No	91	81.3%	21	18.8%	0.44
Yes	14	73.7%	5	26.3%
History of PCNL
No	93	80.2%	23	19.8%	0.98
Yes	12	80.0%	3	20.0%
History of SWL
No	62	78.5%	17	21.5%	0.33
Yes	10	90.9%	1	9.1%
Side
Right	39	81.3%	9	18.8%	0.75
Left	60	78.9%	16	21.1%
Hydronephrosis
No	59	84.3%	11	15.7%	0.25
Yes	38	76.0%	12	24.0%
Stone area (mm^2)	469 ± 372		696 ± 363		0.007^∗
Stone area subgroup
A (≤30 mm^2)	0	0.0%	0	0.0%	0.002^∗
B (31–300 mm^2)	32	97.0%	1	3.0%
C (301–700 mm^2)	53	80.3%	13	19.7%
D (>701 mm^2)	19	61.3%	12	38.7%
The calyx accessed to
Inferior	60	83.3%	12	16.7%	0.72
Middle	31	77.5%	9	22.5%
Superior	11	73.3%	4	26.7%
Pelvis	1	100.0%	0	0.0%
Situation of the Amplatz sheath in the beginning of nephroscopy
Out of the system	33	68.8%	15	31.3%	0.03^∗
In the system	65	87.8%	9	12.2%
Over (passed the system)	6	85.7%	1	14.3%

Data are presented as mean ± standard deviation or count and row percent.
Significant.