Do Stone Characteristics and Laser Fiber Size Affect Ho: YAG Laser Time and Energy During Ureteroscopy?

Figures & data

Table 1 Independent Sample t Test Were Used for Group Comparison

	Group 1 (>1100HU) (n=47)	Group 2 (<1100HU) (n=71)	P value
Location of stone
Intrarenal stone	15	19	0.361
Proximal ureter	20	28
Mid ureter	5	11
Distal ureter	7	13
Overall operative time	57.55±27.601	49.52±31.553	0.866
Stone density	1336.00±161.646	684.49±224.667	0.023
Stone composition
CaOx mono	31	13	0.211
CaOx di	2	13
Mixed stones	14	26
UA	0	14
Apatite	0	3
Struvite	0	2

Table 2 Influence of Renal Stone Treated with Flexible Ureteroscope on Cumulative Laser Energy and Laser Time

	Coef.	95% CI	P value	R^2
Laser energy
Stone size	16,852.29	12,177.28 to 21,527.31	<0.000	0.4730
Location (renal)	9295.021	5072.169 to 13,517.87	<0.000	0.1408
Fiber size (272 μm)	6717.806	2779.959 to 10,655.65	<0.001	0.0896
Predictive value	8.760578	1.011034 to 18.53219	>0.078	0.0526
Calcium oxalate	8318.933	1551.85 to 15,086.02	<0.017	0.0945
Laser time
Stone size	12.83879	9.580965 to 16.09661	<0.000	0.5176
Location (renal)	6.538326	−3.654346 to 9.422307	<0.000	0.1481
Fiber size (272 μm)	0.0079821	0.0009778 to 0.0149865	<0.026	0.0823
Predictive value	5.467632	2.821607 to 8.113657	<0.000	0.1262
Calcium oxalate	5.750714	0.7966664 to 10.70476	<0.024	0.0852

Table 3 Influence of Ureteral Stone Treated with Rigid Ureteroscope on Cumulative Laser Energy and Laser Time

	Coef.	95% CI	P value	R^2
Laser energy
Stone size	3354.445	−576.8698 to 7285.759	0.093	0.0496
Location (ureter)	17,734.8	−24,270.66 to −11,198.94	0.000	0.3454
Fiber size (365 μm)	4.148934	−0.3951693 to 8.693038	0.073	0.0564
Predictive value	−6717.806	−10,655.65 to −2779.959	0.001	0.0896
Calcium oxalate	−510.2664	−4374.965 to 3354.432	0.792	0.0012
Laser time
Stone size	2.85567	1.697707 to 4.013634	0.000	0.3035
Location (ureter)	−5.167939	−7.578751 to −2.757128	0.000	0.2477
Fiber size (365 μm)	0.0027583	0.0013281 to 0.0041885	0.000	0.2104
Predictive value	−5.467632	−8.113657 to −2.821607	0.000	0.1262
Calcium oxalate	0.5672222	−0.7546928 to 1.889137	0.394	0.0130

Data Sharing Statement

All study data and materials can be obtained from the corresponding author.