Login to Access Video or Poster Abstract: MP50-12
Sources of Funding: NONE

Introduction

Despite a considerable increase in obese and overweight population, there is also a significant portion of underweight people worldwide. There are plenty of papers about the relationship of the different BMI indexes on PCNL outcomes and morbidities. However, there is no literature about the correlation between underweight and PCNL results. The aim of the study was to compare perioperative variables of PCNL in patients with BMI scores, and to explore whether they have an effect on the outcomes of this surgery._x000D_

Methods

We conducted a single-center retrospective evaluation of perioperative outcomes and complications in 182 patients who underwent PCNL surgery between 2010 and 2012. Patients were stratified as underweight BMI less than 18.5 kg/m2, normal weight BMI 18.5 to 24.99 kg/m2, overweight 25 to 29.99 kg/m2, and obese more than 30 kg/m2.The groups were assessed in terms of baseline characteristics, intraoperative and postoperative variables, including minor and majors complications. One-way ANOVA and univariate logistic regression analysis were used to assess the association between BMI (classified into 4 levels) and variables mentioned._x000D_

Results

The distributions of the 182 patients in each BMI category were underweight 21 (12%), normal body weight 38 (21%), overweight 72 (39%), and obese 51 (28%). Most of the patients (91.2%) underwent previous unenhanced computed tomography scan in which 38% showed large pelvic stones, 41% staghorn and 2% of anomalous kidneys. There was no difference in the baseline characteristics of groups with respect to age, sex, or stone size. Stone free rates showed no significant differences between groups (p=0.76). Operative time was significantly longer in obese patients (p=0.001). On the other hand, postoperative leakage in days, and the presence of postoperative fever, was significantly higher in the underweight group (p=0.001). There was also one colonic perforation reported in the low BMI group._x000D_

Conclusions

PCNL has demonstrated to be an efficacious and safe procedure in patients with different BMI scores. Our findings suggest that low BMI patients could be at higher risk of perioperative morbidities. Further investigation with a larger series of patients is needed to confirm this observation.

Funding

NONE