Abstract: Objective  To investigate the correlation between perirenal hematoma after renal biopsy in patients with AKI and preoperative dialysis intervention.
  Methods  Clinical data of 180 AKI patients with renal biopsy were retrospectively chosen. All patients were divided different groups according to whether or not dialysis intervention before operation and perirenal hematoma after operation. The baseline clinical characteristics and the indexes of postoperative hemorrhage of different groups were compared, and  the correlation between the perirenal hematoma and the preoperative dialysis intervention by logistic regression method were analyzed.
  Results  ①The proportion of AKI  2-3 stage, Cr and BUN levels in dialysis group were significantly higher than non-dialysis group（P＜0.05）. The Hb level of dialysis group was significantly lower than non-dialysis group（P＜0.05）. ②108 cases(60.0%) were confirmed to have perirenal hematoma by renal ultrasound 24 hours after operation. Among them, there were 46 cases in dialysis group and 62 cases in non dialysis group.There was no significant difference in the incidence of postoperative perirenal hematoma between dialysis group and non-dialysis group（P＞0.05）. The level of Hb of dialysis group was significantly lower than non-dialysis group（P＜0.05）. ③There was no significant difference in baseline clinical characteristics between 2 groups（P＜0.05）. ④Pearson method evaluation results showed that there was no correlation between the occurrence of perrenal hematoma after renal biopsy and preoperative hemodialysis(r=0.34, P=0.26); the results of multivariate analysis showed that the diameter of perinephric hematoma after renal biopsy There is no correlation between the risk of ≥5 cm and preoperative hemodialysis treatment(r=0.27, P=0.35).
  Conclusion  Dialysis intervention before renal puncture is difficult to effectively reduce or avoid the risk of bleeding after renal biopsy.

Key words: acute renal injury, renal dialysis； biopsy, needle