Patients with low body mass index are more likely to develop shoulder pain after laparoscopy

INTRODUCTION: Shoulder pain is one of the most common complications after laparoscopy. Previous studies have found a number of methods to reduce shoulder pain after laparoscopic surgery, but these methods have not been targeted to specific populations. The purpose of this study was to identify people who are more likely to develop shoulder pain. MATERIAL AND METHODS: A total of 203 patients underwent laparoscopy for benign gynecological diseases between July 2020 and February 2021. Patients were divided into two groups according to the Chinese overweight standard, body mass index less than 24 kg/m(2) group and 24 kg/m(2) or more group. The baseline characteristics and intraoperative data between the two groups were compared. The intensity of the shoulder pain was quantified using a visual analog scale (VAS). RESULTS: The incidence and the VAS scores of shoulder pain were significantly higher in the less than 24 kg/m(2) group (63.64% vs 38.03%, p < 0.001 in incidence; median 5 (interquartile range [IQR] 3–7) vs 3 (IQR 2–5), p < 0.001 in VAS scores), and the chance of shoulder pain within 24 hours after laparoscopy was higher in the less than 24 kg/m(2) group (89.29% vs 66.67%, p = 0.013). In univariate and multivariate logistic regression analysis, BMI less than 24 kg/m(2) was an independent risk factor of shoulder pain after laparoscopic surgery (p = 0.001, p = 0.031, respectively). Shoulder pain scores were inversely correlated with BMI (r = −0.300, p = 0.001). CONCLUSIONS: Patients with low body mass index are more likely to develop shoulder pain after laparoscopy, with earlier onset and higher pain scores.