# Chronic Post-Surgical Pain After Laparoscopic Sleeve Gastrectomy: Is the Opioid-Free Anesthesia Superior? A Cross-Sectional Study

## TL;DR

This study finds that a small percentage of patients who had laparoscopic sleeve gastrectomy experience chronic post-surgical pain, and opioid-free anesthesia does not reduce this risk.

## Contribution

The novel contribution is assessing the impact of opioid-free anesthesia on chronic post-surgical pain after bariatric surgery.

## Key findings

- 4.4% of patients who underwent LSG reported chronic post-surgical pain.
- Opioid-free anesthesia did not significantly affect CPSP prevalence or long-term opioid use.
- LSG was associated with reduced pre-existing chronic pain and opioid therapy in most patients.

## Abstract

Background: Chronic post-surgical pain (CPSP) is a phenomenon that negatively influences patients’ quality of life and well-being. By definition, CPSP is a pain in the surgical area of injury that develops or increases after the operation and persists beyond the healing process. One of the populations that is especially vulnerable to CPSP is patients undergoing bariatric surgery, as obesity, chronic inflammation, pre-existing chronic pain, and severe postoperative pain are its risk factors. Therefore, we conducted a cross-sectional study assessing the prevalence of CPSP in patients undergoing laparoscopic sleeve gastrectomy (LSG). We also aimed to explore the potential influence of the promising opioid-free anesthesia (OFA) technique, assess if the CPSP after LSG had a potential neuropathic component, and additionally, determine whether the bariatric surgery altered chronic pain in this patient population. Methods: The study was registered on 11 November 2024, at ClinicalTrials.gov (NCT06686875). A cross-sectional study using e-survey.io was conducted among the patients who underwent LSG 3 months to 5 years earlier. Clinical data were retrieved from the hospital database. Results: Of the 135 patients who responded to our e-survey, 4.4% (n = 6, 95% CI 0.9–8%) reported CPSP. None of them had a PAIN DETECT score above 19, which would indicate a neuropathic component. Of the 32 patients who had pre-existing chronic pain, 31 reported a reduction in its intensity, and of the 16 patients on chronic opioid treatment, 10 discontinued opioid therapy. In a subgroup analysis, there was no significant difference in the prevalence of CPSP and long-term opioid therapy between the patients who had OFA and standard anesthesia (p > 0.05). Conclusions: The main finding of our study is that a minor, yet significant, portion of patients who underwent LSG develop CPSP, and OFA does not alter the risk. LSG appears to reduce pre-existing chronic pain and opioid use.