Early Effects of Percutaneous Nephrolithotomy on Glomerular Filtration Rate and Determining the Potential Risk Factors Responsible for Acute Postoperative Renal Function Impairment
Novelty in Biomedicine,
Vol. 2 No. 3 (2014),
4 August 2014
,
Page 95-101
https://doi.org/10.22037/nbm.v2i3.6803
Abstract
Background: In this study, the early effects of percutaneous nephrolithotomy (PCNL) on glomerular filtration rate (GFR) was assessed in different postoperative times and likewise, we determined the correlation of different variables with significant postoperative GFR drop after PCNL.
Materials and Methods: Patient records of 486 cases that had undergone PCNL from January 2010 to October 2011 were reviewed retrospectively. GFR in six hours, one, two and three days after PCNL and in the discharge day were calculated and then compared with preoperative level. Correlation between different variables (Perioperative hemorrhage, co-morbidities, previous stone surgery, renal anomaly, number of access, stone burden and location) and risk of acute postoperative renal function impairment (GFR drop greater than 25%) were assessed.
Results: Mean preoperative GFR was 87.85±29.41ml/min/1.73m² which decreased to 86.18±28.77, 78.45±28.74, 78.79±26.94, 84.24±29.71 and 86.18±28.77 in 6, 24, 48 and 72 hours after surgery and discharge day post PCNL, respectively. GFR significantly decreased in one and two days after surgery (p value<0.0001 and p value <0.05) but returned to near preoperative values in 3th post PCNL day. Among different variables, only perioperative bleeding (Cut-off point for serum hemoglobin drop was 2.8 mg/dL) was concomitant with significant postoperative renal function impairment.
Conclusion: Our findings revealed that co-morbidities, large or multiple stones, multiple punctures and previous history of stone surgery have no significant impact on surgical outcomes. Postoperative GFR returned to near preoperative values in a few days after operation. Avoidance of significant perioperative bleeding is an important point to prevent post PCNL renal insufficiency.
- Percutaneous nephrolithotomy
- Glomerular filtration rate
- Renal insufficiency
- Risk factor
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References
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