Tubeless procedure is most important factor in reducing length of hospitalization after percutaneous nephrolithotomy: results of univariable and multivariable models.

OBJECTIVES: To evaluate the effects of kidney stones and patient-related parameters on the length of hospitalization (LOH), which is one important factor affecting the cost effectiveness of percutaneous nephrolithotomy (PCNL). Recently, increases in healthcare costs have highlighted the importance of evaluating the cost effectiveness of a treatment as much as its efficacy. MATERIAL AND
METHOD: During an 8-year period, the records of 1669 patients with renal calculi who underwent PCNL were reviewed retrospectively. Eleven patients with urosepsis were excluded from the present study. A total of 1658 patients were categorized into 2 groups (group 1 = ≤2 days; group 2 = >2 days) according to the median LOH (median = 2 days). Multivariate binary logistic regression analysis was used to detect the effects of independent variables, including the patient age, gender, body mass index, history of extracorporeal shock wave lithotripsy or open surgery, stone size and opacity, presence of hydronephrosis, and localization and number of accesses, on the LOH after PNL.
RESULTS: Overall success was achieved in 86.2% of cases after one session of PCNL. The mean length of hospitalization was 2.89 ± 1.66 days (range, 1-21). According to the outcome of the multivariate analysis, diabetes (P = .0001, OR = 1.67), impaired kidney function (P = .03, OR = 1.64), stone size (P = .031, OR = 1.31), number of accesses (P = .001, OR = 1.59), intercostal access (P = .001, OR = 1.79), and tubeless procedure (P = .0001, OR = 0.23) were variables influencing LOH.
CONCLUSIONS: The presence of diabetes, a large stone burden, intercostals access, multiple accesses, and impaired kidney function prolong the LOH after PCNL. The use of the tubeless procedure was able to diminish the LOH.