Table 2 Operative factors in the stone-free and remnant groups.

From: The impact of Hounsfield unit-related variables on percutaneous nephrolithotomy outcomes

 

Stone-free (N = 149)

Remnant (N = 39)

p

OP time (mins)

56.4 ± 22.6

65.5 ± 22.9

0.027

Access time (mins)

7.7 ± 4.4

7.6 ± 5.0

0.939

Total nephroscopy time (mins)

18.3 ± 10.4

25.9 ± 17.1

0.072

Subcostal approach

111 (74.5%)

28 (71.8%)

0.891

Antegrade D–J catheter

70 (46.98%)

15 (38.46%)

0.441

LOS (days)

3.4 ± 3.7

2.8 ± 1.2

0.096

Complication (n)

18 (12.2%)

7 (17.9%)

0.496

Transfusion (n)

4 (2.68%)

0

0.586

Change in Hct (%)

− 6.4 [− 7.7; − 3.6]

− 6.3 [− 8.9; − 4.9]

0.305

Change in Hb (g/dL)

− 2.0 [− 2.8; − 1.2]

− 2.1 [− 3.0; 1.7]

0.383

Change in Cr (mg/dL)

− 0.10 [− 0.21; 0.03]

− 0.09 [− 0.15; 0.11]

0.209

Change in eGFR (1 month) mL/min/1.73 m2

− 10.5 [− 21.0; 1.0]

− 6.0 [− 15.5; 2.5]

0.286

  1. SHI stone heterogeneity index; standard deviation of Hounsfield unit.
  2. Variation coefficient: Hounsfield unit/standard deviation of Hounsfield Unit × 100 (%).
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