Effectiveness of Infliximab in Patients with Complex Regional Pain Syndrome: A Case Series

Abstract

Corinne van den Berg, Maaike Dirckx, Frank JPM Huygen, Jitske Tiemensma Department of Anesthesiology, Center for Pain Medicine, Erasmus University Medical Center, Rotterdam, the NetherlandsCorrespondence: Corinne van den Berg, Department of Anesthesiology, Center for Pain Medicine, Erasmus University Medical Center, Postbus 2040, Rotterdam, 3000CA, the Netherlands, Tel [phone], Fax [phone], Email [email protected]: Complex regional pain syndrome (CRPS) is a multi-mechanism disease, with an exaggerated inflammatory response as an important underlying mechanism. Auto-inflammation can theoretically be combated by anti-inflammatories, such as TNF-α inhibitors. This study’s aim was to assess the effectiveness of intravenous infliximab, a TNF-α inhibitor, in patients with CRPS.Patients and Methods: CRPS patients treated with infliximab between January 2015 and January 2022 were approached to participate in this retrospective study. Medical records were screened for age, gender, medical history, CRPS duration, and CRPS severity score. Additionally, treatment effect, dose and duration, and side effects were extracted from medical records. Patients who still receive infliximab completed a short global perceived effect survey.Results: Eighteen patients received infliximab, and all but two gave consent. Trial treatment with three sessions of 5 mg/kg intravenous infliximab was completed in 15 patients (93.7%). Eleven patients (73.3%) were categorized as responders with a positive treatment effect. Treatment was continued in nine patients, and seven patients are currently treated. Infliximab dose is 5 mg/kg, and frequency is every four to six weeks. Seven patients completed a global perceived effect survey. All patients reported improvement (median 2, IQR 1– 2) and treatment satisfaction (median 1, IQR 1– 2). One patient described side effects such as itching and rash.Conclusion: Infliximab proved effective in 11 out of 15 CRPS patients. Seven patients are still being treated. Further research is needed on the role of infliximab in the treatment of CRPS and possible predictors of response to treatment.Keywords: complex regional pain syndrome, CRPS, TNF-α inhibitors, treatment, inflammation, anti-inflammatories

Keywords

• complex regional pain syndrome
• crps
• tnf-α inhibitors
• treatment
• inflammation
• anti-inflammatories