Abstract
Background: catastrophizing is a negative cognitivo-affective response to an anxiety-provoking stimulus, especially anticipated or actual pain. It can be assessed quickly using a validated questionnaire: the Pain Catastrophizing Scale (PCS) 1 . Catastrophizing plays a role in maintaining chronic pain and is associated with several pain-related outcomes in osteoarthritis and low back pain. There is a lack of knowledge about catastrophizing in axial spondyloarthritis (AS) with only one study 2 so far. Objectives: To assess the prevalence of catastrophizing and associated factors in spondyloarthritis. Methods: We performed an observational, prospective, bi-centric study. All patients aged 18 or over with AS fulfilling the 2009 Assessment in Spondyloarthritis International Society (ASAS) criteria were consecutively included. Sociodemographic data, information on the disease and its treatments were collected as well as questionnaires regarding disease activity (BASDAI), function (HAQ, BASFI), quality of life (SF12, EQ5D), anxiety and depression (HADS, GAD7), fibromyalgia (FiRST), insomnia (ISI) and catastrophizing scores (PCS). Statistical analysis included a samples t-test, one-way variance analysis, Spearman’s correlation coefficient, the Chi 2 test, Fisher’s exact test, the Wilcoxon test, multivariate linear regression (considering catastrophizing as a continuous variable) and multivariate logistics regression (considering catastrophizing as a categorical variable: PCS ≥20 = high level catastrophizing). Results: from September 2019 to March 2020, 168 AS patients were included: 48.5% were women, the median age was 48.5 years and 100 patients (60.2%) were professionally active. Almost all patients (95.8%) had a disease lasting for more than 2 years; 110 (72%) were HLA-B27+; 84 (50%) had MRI sacroiliitis and 62 (37.6%) radiographic sacroiliitis. In all, 166 (98.8%) had axial involvement, 99 (58.9%) had peripheral involvement and 44 (26.2%) had enthesitic involvement. The median BASDAI score was 6.30 [Q1-Q3 4.65-6.30]. The prevalence of a PCS score ≥20 was 45.5% [38.0;53.0]. The median PCS score was 18 [7-27]. In multivariate logistics regression, high-level catastrophizing was significantly associated with the HADS anxiety score (OR=1.54 [1.22-2.0]), HADS depression score (OR=1.25 [1.10-1.43]) and disease activity (BASDAI OR=1.14 [1.01-1.26]). In multivariate linear regression, catastrophizing was also significantly associated with anxiety (p<0.0001), depression (p<0.0001) and disease activity (p=0.0008). Conclusion: almost half the patients with AS were high catastrophizers. Catastrophizing is linked to anxiety, depression, and disease activity. It may be interesting to detect catastrophizing in order to improve the management of our patients.