The Impact of Body Mass Index on Perioperative Outcomes in Patients Undergoing Percutaneous Nephrolithotomy

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Napat Amornratananont
Premsant Sangkum
Yada Phengsalae
Charoen Leenanupunth
Chinnaket Ketsuwan


Background: To date, percutaneous nephrolithotomy (PCNL) is the gold standard treatment for patients with large renal calculi (RC). Whether obesity has an adverse effect on its success remains controversial.
Objective: To compare the perioperative outcomes of PCNL among Thai individuals with various
body mass indices (BMI).
Material and method: A retrospective, cross-sectional study was conducted among 205 patients
who underwent PCNL in Ramathibodi Hospital between January 2011 and August 2019. The patients were classified into normal weight (n=98, BMI 18.5 - 24.9 kg/m2); overweight (n=76, BMI 25.0 - 29.9 kg/m2); and obese group (n=31, BMI ≥30.0 kg/m2). Perioperative outcomes were statistically compared between groups.


Results: Stone-free status in the obese group was not different from the normal weight and overweight
group (64.5%, 58.2% and 50.0% respectively, p=0.338). There were no significant differences in blood loss (p=0.966), operative time (p=0.663), percentage change of eGFR (p=0.259), length of stay (p=0.381) and postoperative complications (p=0.435) between the three groups.
Conclusion: BMI did not affect the perioperative outcomes of PCNL. Its outcomes in obese patients
were not different from those of normal-weight patients.


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How to Cite
Amornratananont, N., Sangkum, P., Phengsalae, Y., Leenanupunth, C., & Ketsuwan, C. (2020). The Impact of Body Mass Index on Perioperative Outcomes in Patients Undergoing Percutaneous Nephrolithotomy. Lampang Medical Journal, 40(2), 71–79. Retrieved from
Original Article


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