OP0268 HPR THE PREVALENCE AND IMPACT OF FATIGUE IN PEOPLE WITH PRIMARY ANTIPHOSPHOLIPID SYNDROME: A MIXED METHODS STUDY

Background Primary antiphospholipid syndrome (pAPS) is a prothrombotic disorder associated with increased morbidity and mortality1. Symptoms include fatigue but the prevalence and impact of fatigue is unknown. Objectives To explore the prevalence, relationships and impact of fatigue in adults with pAPS. Methods This mixed methods study recruited participants from one public hospital, UK. Inclusion criteria comprised: adults with ≥6 month history of pAPS (Sydney classification criteria) and sufficient written and spoken English. Exclusion criteria included: other autoimmune rheumatic/inflammatory disorders; cancer; active chronic infections, positive Antinuclear antibody, pregnancy/breast-feeding, drugs/alcohol dependency and BMI>30. Consenting participants completed seven questionnaires to record sociodemographc characteristics, fatigue (Fatigue Severity Scale (FSS), FACIT-Fatigue subscale, (FS)), social support (Multi-Dimensional Perceived Social Support Scale (MDPSS), mood (Patient Health Questionnaire (PHQ-9), quality of life (EQ-5D-5L), sleep quality (Pittsburgh Sleep Quality Index (PSQI) and physical activity (International Physical Activity Questionnaire (IPAQMETS)). The relationship between fatigue (FSS) and predictor variables were explored using Spearman’s Rho correlation coefficients and backward stepwise regression analyses. Audio recorded, semi structured interviews were conducted with a subset of participants by two researchers with an agreed topic guide. Interviews were transcribed verbatim, anonymised, and analysed thematically with NVivo 10. The data was validated by a subsample of participants, cross-referencing the emergent codes and themes. Results 103 participants were recruited (87 complete datasets; mean (standard deviation) 50.3 (10.4) years, 8 men, 49 thrombotic APS). 69% of participants reported clinically relevant fatigue (FSS>3) and 62% of participants indicated severe fatigue (FSS>4). FSS was positively associated with PSQI (rs(67)=0.269 p=0.025), PHQ9 (rs(83)=0.602 p The best fit model explained 62% of the variance in FSS (adjusted R2=0.617,F(5,62)=22.63,p>0.001) and included FS, MSPSS, PHQ9, and IPAQMETS as significant predictors. For every 1 unit increase in FS, MSPSS, IPAQMETS and PHQ9, FSS decreased by -0.087 points, -0.084 points and -9.7*10-5 MET/minutes or increased by 0.090 points respectively. Twenty participants (10 obstetric/10 thrombotic pAPS) completed interviews (duration 20-50 minutes). Participants with obstetric pAPS were younger. Five themes were identified across both subgroups: 1. Unpredictability of fatigue 2. Impact on daily life 3. Physical activity matters 4. Individual coping strategies 5. Acknowledgement and help with fatigue from clinicians. Conclusion Fatigue is a common, overwhelming, unpredictable symptom of pAPS which is a challenge to manage. Social support, mood and physical activity predicted fatigue severity. Interviewees tended not to discuss fatigue with clinicians due to lack of observed response or empathy. Participants perceived physical activity as important but difficult to complete regularly. Interventions to manage fatigue and support physical activity are needed for adults with pAPS. Reference [1] Cervera R, et al. Annals of the rheumatic diseases. 2015 Jun 1;74(6):1011-8 Disclosure of Interests None declared