Research Article
Comparison of Outcomes between Two Methods to Extract Stone Fragments during Flexible Ureteroscopic Lithotripsy
Table 1
Comparison of measured demographic, clinical, stone, and operative variables between methods of extraction of stone fragments.
| | AE | SE | value |
| Number of patients | 109 | 87 | | Age, years | 64 (20–90) | 65 (24–89) | 0.523 | Sex | | | | Female | 48 (44%) | 45 (52%) | 0.284 | Male | 61 (56%) | 42 (48%) | Side | | | | Right | 52 (48%) | 39 (49%) | 0.597 | Left | 57 (52%) | 48 (51%) | Height (cm) | 162 (139–180) | 160 (128–181) | 0.209 | Body mass index (kg/m2) | 23.9 (15.4–37.9) | 24.0 (15.7–33.9) | 0.407 | Number of stones | 1 (1–7) | 1 (1–10) | 0.201 | Stone volume (mm3) | 175.5 (0.175–4484) | 249 (2.5–1830) | 0.178 | Cumulative stone diameter (mm) | 10 (0.5–54) | 13 (2–41) | 0.051 | Lower pole calculi () | 40 (37%) | 34 (39%) | 0.491 | Number of calyx involving stone | | | | 0 | 59 (54%) | 42 (48%) | 0.716 | 1 | 34 (31%) | 27 (31%) | 2 | 11 (10%) | 13 (15%) | 3 | 5 (5%) | 5 (6%) | Hounsfield Units | | | | Maximum | 1074 (152–1830) | 1215 (284–1884) | | Mean | 751 (151–1671) | 853 (134–1530) | 0.554 | Hydronephrosis () | 32 (29%) | 31 (36%) | 0.35 | Access sheath (Fr) | | | | 13 | 9 (8%) | 25 (29%) | | 14 | 35 (32%) | 18 (21%) | 15 | 65 (59%) | 44 (56%) | Preoperative stenting () | 67 (61%) | 47 (54%) | 0.294 | SWL failure () | 13 (12%) | 8 (9%) | 0.449 | Operator’s experience of fURSL | 15 (1–50) | 11 (1–156) | 0.075 | Operative time (min) | 85 (18–194) | 80 (22–149) | 0.182 | Postoperative length of stay | 2 (1–9) | 2 (0–7) | 0.115 | Postoperative fever () | 20 (18%) | 15 (17%) | 0.306 | Stone free (%) | 61.5 | 90.8 | <0.001 | Stone composition | | | | CaOX | 77 (71%) | 34 (39%) | | CaP | 3 (3%) | 3 (3%) | UA | 2 (2%) | 3 (3%) | MAP | 6 (6%) | 14 (16%) | Mixed | 17 (16%) | 29 (33%) | other | 1 (1%) | 0 (0%) | unknown | 3 (3%) | 4 (5%) |
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AE: assistant extraction; SE: surgeon extraction; CaOX: calcium oxalate; CaP: calcium phosphate; UA: uric acid; MAP: magnesium ammonium phosphate; significant. |