Poster Session 7: Stone disease| Volume 8, ISSUE 8, P640, September 2009

S98 Effect of the stone and patient related parameters on time duration of percutaneous nephrolitotomy operation and the length of hospitalization: Analysis of 1466 patients

      Introduction and Objectives

      To evaluation effect of the stone and patient related parameters on the duration of PNL and length of hospitalization (LOH).

      Material and Methods

      During 7 years period, the records of 1466 patients with renal calculi who underwent PNL were reviewed retrospectively. According to median, duration of operation time (median = 60 min) and LOH (median = 2 days) were categorized to two groups. Multivariate binary logistic regression analysis was used for detecting the effects of independent variables included patient age, sex, body mass index(BMI), history of SWL or open surgery, stone size and opacity, presence of hydronephrosis, localization and number of access, per-operative and post-operative findings and complications on the duration of PNL and LOH.


      The mean operation time and LOH were 62.6±25.4 (10–210) min and 2.9±1.6 (1–21) days respectively. Overall success was achieved in 84.7%. According to outcome of multivariate analysis, stone size (p < 0.0001, OR = 1.97), presence of hydronephrosis (p = 0.014, OR = 2.1), bleeding blurring the vision during operation (p < 0.0001, OR = 1.7) and number of access (p < 0.0001, OR = 1.4) are significant independent predictors on the duration of operation during PNL. On the other hand, BMI (p = 0.008, OR = 0.82), stone size (p = 0.01, OR= 1.2), number of access (p < 0.0001, OR = 1.7) and postoperative fever or sepsis (p = 0.001, OR = 4.5) are factors influencing LOH.


      Stone size and access number significantly affect the both operation time and LOH. However, presence of hydronephrosis and bleeding blurring the vision influence the operation time. Present data demonstrated statistical relationship between BMI and LOH. Post-operative fever and sepsis after PNL significantly increase LOH.