Background: Very little evidence is available on the prevalence of serious spinal pathologies and the diagnostic accuracy of red flags in patients presenting to the emergency department (ED). This systematic review aims to investigate the prevalence of serious spinal pathologies and the diagnostic accuracy of red flags in patients presenting with low back pain to the ED. Methods: We systematically searched MEDLINE, PUBMED, EMBASE, Cochrane Library, and SCOPUS from inception to January 2019. Two reviewers independently reviewed the references and evaluated methodological quality. Results: We analyzed 22 studies with a total of 41'320 patients. The prevalence of any serious spinal pathology requiring immediate/urgent treatment was 2.5-5.1% in prospective and 0.7-7.4% in retrospective studies (0.0-7.2% for vertebral fractures, 0.0-2.1% for spinal cancer, 0.0-1.9% for infectious disorders, 0.1-1.9% for pathologies with spinal cord/cauda equina compression, 0.0-0.9% for vascular pathologies). Examples of red flags which increased the likelihood for a serious condition were: suspicion and/or history of cancer (spinal cancer); intravenous drug use, indwelling vascular catheter, other infection site (epidural abscess). Conclusion: We found a higher prevalence of serious spinal pathologies in the ED compared to the reported prevalence in primary care settings. As the diagnostic accuracy of most red flags was reported only by a single study, further validation in high quality prospective studies is needed.

Recent research has highlighted a need for the psychometric evaluation of instruments targeting core domains of the pain experience in chronic pain populations. In this study, the measurement properties of Short Form-36 Health Survey (SF-36),EuroQol 5-dimensions (EQ-5D) and Hospital Anxiety and Depression Scale (HADS) were analyzed within the item response-theory framework based on data from 35,908 patients. To assess the structural validity of these instruments, the empirical representations of several conceptually substantiated latent structures were compared in a cross-validation procedure. The most structurally sound representations were selected from each questionnaire and their internal consistency reliability computed as a summary of their precision. Finally, questionnaire scores were correlated with each other to evaluate their convergent and discriminant validity. Our results supported that SF-36 is an acceptable measure of 2 independent constructs of physical and mental health. By contrast, although the approach to summarize the health-related quality of life construct of EQ-5D as a unidimensional score was valid, its low reliability rendered practical model implementation of doubtful utility. Finally, rather than being separated into 2 subscales of anxiety and depression, HADS was a valid and reliable measure of overall emotional distress. In support of convergent and discriminant validity, correlations between questionnaires showed that theoretically similar traits were highly associated, whereas unrelated traits were not. Our models can be applied to score SF-36 and HADS in chronic pain patients, but we recommend against using the EQ-5D model due to its low reliability. These results are useful for researchers and clinicians involved in chronic pain populations because questionnaires' properties determine their discriminating ability in patient status assessment.

Chronic pain is a common condition that negatively affects most areas of a persons' life and is difficult to alleviate. Research indicates that interdisciplinary multimodal pain rehabilitation is effective in improving physical and emotional functioning, but little is known about the prognostic factors for a good treatment outcome. Therefore, this study investigated how different patient characteristics related to these outcomes, by following 2,876 patients across Sweden over a 1-year period. It was found that patients who were either currently working or on short-term sick leave clearly had a better prognosis in both outcomes than those with a longer time off from work. In addition, positive treat ment expectations, levels of emotional health, and coping strategies played an important role, but were not consistent for both outcomes, suggesting a complex prognostic picture for the overall understanding of improvement. These results emphasize the importance of early intervention before patients are too distanced from the labour market. Objective: To investigate prognostic factors for physical and emotional functioning following interdisciplinary multimodal pain rehabilitation, by targeting patients' baseline characteristics and health measures. Methods: A prospective cohort of 2,876 patients from 38 specialist clinics across Sweden, who were completing interdisciplinary multimodal pain rehabilitation programmes, was followed through the Swedish Quality Registry for Pain Rehabilitation, from initial assessment to 12-month follow-up. Using logistic regression, baseline data were regressed to predict improvement in Physical functioning and Emotional functioning, derived from principal component analyses of the 36-item Short Form Health Survey (SF-36) and the Hospital Anxiety and Depression Scale (HADS). Results: Employment status emerged as having the largest effect sizes in both Physical functioning and Emotional functioning; Working: odds ratio (OR) 2.05 (95% confidence interval (95% CI) 1.64-2.56) and OR 1.59 (95% CI 1.27-1.98), respectively. Strong beliefs in restored health, better initial emotional health, lower levels of pain and pain interference, and younger age all predicted Physical functioning. European origin, higher levels of general activity, and sense of life control all predicted Emotional func tioning. Worse initial physical and emotional health predicted the corresponding dependent outcomes. Conclusion: Employment was consistently found to be an important prognostic factor, suggesting the significance of avoiding delay in interdisciplinary multimodal pain rehabilitation. A positive treatment expectancy was of importance. In general, multidimensional measures indicated that better initial status was more favourable; however, inconsistency implies a complex prognostic picture.

The objective of this study was to examine the psychometric properties of the Chinese version of the Dermatology Life Quality Index (DLQI) and to assess the invariance of its items with respect to several patient parameters via Rasch analysis. Data were aggregated from 9,845 patients with various skin diseases across 9 hospitals in different regions of China. The response structure, local independence, and reliability of the DLQI scale were analysed in a partial credit model, and differential item functioning (DIF) across region, disease, sex, and age were assessed with a Mantel-Haenszel procedure. Although acceptable scale reliability (Person Separation Index=2.3) was obtained, several problems were revealed, including disordered response thresholds, misfitting items, DIF by geogra-phical region and disease, and mis-targeting patients with mild impairment regarding health-related quality of life (HRQL). In conclusion, the DLQI provides inadequate information on patients' impairments in HRQL, and the application of the DLQI in Chinese patients with skin disease is limited.