Abstract:Objective:To investigate the factors for bleeding during minimally invasive percutaneous nephrolithotomy (MPCNL). Methods:The clinical data of 360 patients who underwent MPCNL by a single surgeon from September 2011 to May 2012 were analyzed retrospectively. The clinical factors for bleeding included age, body mass index (BMI), hypertension, diabetes, hepatic insufficiency, renal insufficiency, urinary infection, history of open surgery in kidney, thickness of the renal parenchyma, hydronephrosis and stone size. The surgery-related factors for bleeding included the approach to suspected renal calix, size and number of tract, operative time, operation complications, and operation staging. The relation between the factors and bleeding during MPCNL was analyzed. Results:All the procedures were successfully completed. Multiple linear regression analysis showed that stone size (P=0.031), hydronephrosis (P=0.024), thickness of renal parenchyma (P=0.000), diabetes (P=0.038), operative time (P=0.035), number of tract (P=0.026), operation staging (P=0.000), and operation complications (P=0.000) significant affected blood loss. Conclusions:The size of stone, hydronephrosis, thickness of renal parenchyma, diabetes, operative time, number of tract, operation staging, and operation complications are the main risk factors for bleeding in MPCNL. Avoiding operation complications, reducing tracts and operative time, and selecting staging operation may reduce the risk of bleeding during MPCNL.
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