It is not always necessary for patients with not so severe acute obstructive pyelonephritis due to upper urinary tract calculi to undergo drainage

抄録

  （Purpose）To evaluate the necessity of drainage for patients with acute obstructive pyelonephritis due to upper urinary tract calculi.
  （Methods）This retrospective study investigated 78 patients who were treated for not so severe obstructive pyelonephritis from 2008 to 2012. We divided the patients into two groups according to whether they received drainage or not and compared their clinical variables. We also evaluated the risk factors for the occurence of severity after hospitalization.
  （Results）Thirty-eight patients（48.7%）received drainage. The patients who had urolithiasis with a maximum stone diameter of less than 8mm or one in the distal ureter underwent drainage significantly less than the other patients. Multivariate analysis demonstrated that stone location and thrombocytopenia were risk factors for increased severity.
  （Conclusions）Patients who have distal ureteral stones less than 8mm in diameter and no thrombocytopenia may benefit from not undergoing drainage when they are diagnosed with acute obstructive pyelonephritis that is not so severe.