Effect of body mass index on the operation time and postoperative hospital stay of retroperitoneal laparoscopic renal cyst decortication

Abstract

ObjectiveTo investigate the effect of body mass index (BMI) on the operation time and postoperative hospital stay for patients who underwent retroperitoneal laparoscopic decortication for a single simple renal cyst. MethodsA retrospective cohort study was conducted among 81 patients with single simple renal cyst who had undergone retroperitoneal laparoscopic cyst decortication from January 2017 to December 2019 in Wuxi Xishan People's Hospital. All patients were divided into three groups according to BMI: normal group (BMI<25 kg/m2, n = 44), overweight group (BMI = 25–30 kg/m2, n = 21), and obese group (BMI>30 kg/m2, n = 16). Multiple linear regression was conducted to investigate the correlation. ResultsThe three groups were comparable in terms of age, gender, maximum diameter of cyst, and cyst location. In the aspect of operation time, only the patients in obese group had longer duration when compared with those in the normal group (59.1 ± 15.7 min vs. 45.2 ± 12.8 min, p = 0.001). And the patients in the obese group had significantly longer hospital stay compared with those in the normal group (6.2 ± 1.9 d vs. 5.2 ± 0.5 d, p = 0.002) and overweight group (6.2 ± 1.9 d vs. 5.0 ± 1.0 d, p = 0.001). In the analysis of multiple linear regression, it was found that operation time is significantly affected by BMI and location 2, with coefficients of 1.299 and −8.646 respectively. The influence of BMI was greater than location 2 (0.335 vs. −0.289). For hospital stay, only BMI had an effect on it, with a coefficient of 0.110. ConclusionBMI was a major factor that associated with longer operation time and hospital stay in patients with retroperitoneal laparoscopic renal cyst decortication.