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Background: For the treatment of chronic pain, interdisciplinary treatment programs are recommended. Despite continuous adaptation and optimization of this cost- and time-intensive and comprehensive form of therapy, it is not successful in some patients. As personality disorders have an important influence on social interaction and behaviour, the aim of our study was to identify the possible impact of patients with personality disorders on group dynamics and to analyse the influence of group dynamics on individual therapy outcomes., Methods: We conducted a prospective observational study in patients with chronic pain (N = 104) who participated in a 5-week interdisciplinary treatment program. The main outcome parameters were psychological state and pain intensity before and after the program., Results: In contrast to our clinical assumption, we found that neither the type nor the number of patients with personality accentuation or personality disorders had a clinically relevant influence on group dynamics and that even a negative group dynamic did not negatively influence the individual therapy outcome., Discussion: This trial analysed the connection between group dynamics and therapy outcome of multimodal pain therapies in chronic pain patients considering the factor of personality disorders. Our data demonstrated that neither the type nor the number of patients with personality disorders had a clinically relevant influence on group dynamics and that even a negative group dynamic did not negatively influence the individual therapy outcome. Hence, clinicians should not be afraid to include patients with personality disorders in their treatment programs., Significance Statement: The study emphasizes that clinicians may include patients with personality disorders in multimodal pain treatment programs and groups, provided that the maintenance of a close therapeutic bond with the patient and within the interdisciplinary team is given., (© 2024 European Pain Federation ‐ EFIC ®.)

Objectives: Interdisciplinary treatment programmes are the gold standard for patients suffering from chronic pain. However, several patient-related factors seem to influence the patients' outcome. The aim of our study was to inquire whether patients with personality disorders (PD) might benefit less from an interdisciplinary treatment programme compared to patients without PD., Methods: A prospective, observational study with chronic pain patients attending a 5-week interdisciplinary treatment programme was performed. Main outcome parameters were psychological stabilization and pain intensity before and after the programme., Results: Out of the 104 included patients, 71 (68.3%) showed personality accentuations and 16 (15.4%) were diagnosed with PDs. PDs were mostly classified as histrionic, followed by borderline and narcistic personality. Patients diagnosed with histrionic accentuation showed a significantly better treatment response in terms of pain. Reduction in ADS (Allgemeine Depressionsskala - depression scale) was 3.4 in patients with PD and 11.1 in those without PD. Borderline patients showed a significant increase of ADS (by 2.0; p  < 0.05) after programme completion., Discussion: Patients with chronic pain and personality accentuations or disorder only showed a slightly different outcome after interdisciplinary treatment programme and should therefore not be excluded from these programmes. Registered at German Clinical Trials Register (DRKS-ID: DRKS00015141).

Multidisciplinary pain treatment programs (MPTP) have been considered to be the most effective treatment of chronic pain. In this study, we analyzed the influence of seasons on the outcome of chronic pain patients undergoing MPTP. Therefore, a prospective, observational trial was conducted in patients with chronic pain undergoing a 5-week interdisciplinary treatment program. Psychological stabilization (measured by ADS - Allgemeine Depressionsskala) and pain levels (measured by NRS - numeric rating scale) were considered as primary endpoints. As a result of this study, we could show that chronic pain patients (exempt patients with chronic headache) showed a highly significant better improvement in terms of ADS after MPTP when participating in autumn (coefficient: -11.67, p = .004). Patients treated during winter showed a tendency towards a better improvement in ADS scores (coefficient: -6.89, p = .051). These effects were not found in patients suffering from chronic headache. Finally, patients participating in MPTPs during summer, autumn, and winter presented a tendency of higher reduction in pain scores when compared to patients participating in spring. In conclusion, the effect of MPTPs in terms of psychological stabilization is considered to be best during autumn. This should be therefore considered in planning an MPTP in all patients who do not need immediate psychological stabilization. The treatment effect of MPTP on pain seems not being dependent on a specific season.