Validation of the rheumatic disease comorbidity index

Frailty as a novel predictor of achieving comprehensive disease control (CDC) in rheumatoid arthritis

BACKGROUND

Frailty is a construct recently introduced in the context of inflammatory joint diseases. To date, it is not clear if frailty can act as a negative factor in the achievement of comprehensive disease control (CDC) in patients suffering from rheumatoid arthritis (RA).

AIM

To verify whether frailty is a factor hindering the achievement of CDC in patients with RA starting a biologic drug.

METHODS

RA patients requiring a treatment with a biologic drug were included. Patients were classified as achieving or not achieving CDC after 12 months of treatment. Patients were classified as non-frail, mildly frail, moderately frail and severely frail according to the Comprehensive Rheumatologic Assessment of Frailty (CRAF). Frailty was tested using the Mann-Whitney or Kruskal-Wallis test for continuous variables and chi-square test or Fisher's exact test for comparison with categorical variables. A multivariable logistic regression was performed to identify factors associated with prediction of CDC achievers.

RESULTS

A total of 214 RA patients were followed for 12 months, 14.5% achieved CDC. Eighty-four (39.3%) patients were non-frail, 57 (26.6%) were mildly frail, 14 (6.5%) were moderately frail and 59 (27.6%) were severely frail. The multivariable logistic regression analysis identified the CRAF score at baseline as an independent variable for CDC achievement at 12 months (p = 0.0040).

DISCUSSION

Frailty is a frequent condition in RA patients and reduces the chances of achieving CDC.

CONCLUSIONS

Frailty, measured by CRAF, reduced the likelihood of CDC achievement in RA patients treated with a biologic agent. Key Points • Frailty is an under-researched condition in rheumatoid arthritis affecting more than 60% of patients. • Frailty is a condition that hinders the achievement of comprehensive disease control after 1 year of treatment with biological drugs in patients with rheumatoid arthritis.

Sociodemographic determinants in the evolution of pain in inflammatory rheumatic diseases: results from ESPOIR and DESIR cohorts

Objective

To determine whether socio-demographic factors are associated with heterogeneity in pain evolution in inflammatory rheumatic diseases (IRDs) after accounting for disease-specific characteristics in a system with universal health care.

Methods

This analysis included the data from two prospective observational cohorts of early IRDs (ESPOIR for early RA and DESIR for early SpA). Data on pain was measured, respectively, on 13 and 9 occasions spanning 10 and 6 years of follow-up using the Short-Form 36 bodily pain score for 810 participants of ESPOIR, and 679 participants of DESIR. Linear mixed models were used to characterize differences in pain evolution as a function of age (tertiles), sex, ethnicity, education, marital, and professional status, after accounting for disease-related, treatment, lifestyle, and health factors.

Results

While transitioning from early (disease duration ≤6 months for RA and ≤3 years for SpA) to long-standing disease, differences in pain evolution emerged as a function of age (P < 0.001), sex (P = 0.050), and ethnicity (P = 0.001) in RA, and as a function of age (P = 0.048) in SpA; younger age, males, and Caucasians exhibited lower pain in the latter phases of both diseases. Highly educated participants (RA, β = −3.8, P = 0.007; SpA, β = −6.0, P < 0.001) for both diseases, and Caucasians (β = −5.6, P = 0.021) for SpA presented with low pain early in the disease, with no changes throughout disease course.

Conclusion

Being older, female, non-Caucasian and having lower education was found to be associated with worse pain in early and/or long-standing IRDs, despite universally accessible health-care. Early identification of at-risk populations and implementation of multidisciplinary strategies may reduce patient-reported health outcome disparities.

Trial registration registrations

ESPOIR: ClinicalTrials.gov, www.clinicaltrials.gov, NCT03666091. DESIR: ClinicalTrials.gov, www.clinicaltrials.gov, NCT01648907.

Clinical and bioethical implications of health care interruption during the COVID-19 pandemic: A cross-sectional study in outpatients with rheumatic diseases

BACKGROUND

To determine the impact of health care interruption (HCI), on clinical status of the patients reincorporated to an outpatient clinic for rheumatic diseases (OCDIR), from a tertiary care level center who was temporally switched to a dedicated COVID-19 hospital, and to provide a bioethical analysis.

METHODS

From March to June 2020, the OCDIR was closed; since June, it is limited to evaluate 25% of the ongoing outpatients. This cross-sectional study surveyed 670 consecutive rheumatic outpatients between June 24th and October 31th, concomitant to the assessment of the rheumatic disease clinical status by the attendant rheumatologist, according to disease activity level, clinical deterioration and adequate/inadequate control. Multiple logistic regression analysis identified factors associated to HCI and to clinical deterioration.

RESULTS

Patients were middle-aged females (86.7%), with median disease duration of 10 years, comorbidity (38.5%) and 138 patients (20.6%) had discontinued treatment. Primary diagnoses were SLE and RA, in 285 (42.5%) and 223 (33.3%) patients, respectively. There were 344 patients (51.3%) with HCI. Non-RA diagnosis (OR: 2.21, 95%CI: 1.5-3.13), comorbidity (OR: 1.7, 95%CI: 1.22-2.37), patient's need for rheumatic care during HCI (OR: 3.2, 95%CI: 2.06-4.97) and adequate control of the rheumatic disease (OR: 0.64, 95%CI: 0.45-0.9) were independently associated to HCI. There were 160 patients (23.8%) with clinical deterioration and associated factors were disease duration, substantial disease activity previous HCI, patients need for rheumatic care and treatment discontinuation.

CONCLUSIONS

HCI during COVID-19 pandemic impacted course of rheumatic diseases and need to be considered in the bioethical analysis of virus containment measures.

Validity of the Health Assessment Questionnaire Predicting All-Cause Mortality in Early Rheumatoid Arthritis: Reply to three letters to the editor

We appreciate the interest in our manuscript concerning the Health Assessment Questionnaire disability index (HAQ) in an early rheumatoid arthritis incident cohort (the CATCH cohort) which predicted all-cause mortality (1). We will clarify queries raised in letters to the editor (2-4).

Central Aspects of Pain in Rheumatoid Arthritis (CAP-RA): protocol for a prospective observational study

BACKGROUND

Pain and fatigue are persistent problems in people with rheumatoid arthritis. Central sensitisation (CS) may contribute to pain and fatigue, even when treatment has controlled inflammatory disease. This study aims to validate a self-report 8-item questionnaire, the Central Aspects of Pain in Rheumatoid Arthritis (CAP-RA) questionnaire, developed to measure central pain mechanisms in RA, and to predict patient outcomes and response to treatment. A secondary objective is to explore mechanisms linking CS, pain and fatigue in people with RA.

METHODS/DESIGN

This is a prospective observational cohort study recruiting 250 adults with active RA in secondary care. The CAP-RA questionnaire, demographic data, medical history, and patient reported outcome measures (PROMs) of traits associated with central sensitization will be collected using validated questionnaires. Quantitative sensory testing modalities of pressure pain detection thresholds, temporal summation and conditioned pain modulation will be indices of central sensitization, and blood markers, swollen joints and ultrasound scans will be indices of inflammation. Primary data collection will be at baseline and 12 weeks. The test-retest reliability of CAP-RA questionnaire will be determined 1 week after the baseline visit. Pain and fatigue data will be collected weekly via text messages for 12 weeks. CAP-RA psychometric properties, and predictive validity for outcomes at 3 months will be evaluated.

DISCUSSION

This study will validate a simple self-report questionnaire against psychophysical indices of central sensitization and patient reported outcome measures of traits associated with CS in a population of individuals with active RA. The application of this instrument in the clinical environment could provide a mechanism-based stratification tool to facilitate the provision of targeted therapy to individuals with pain and fatigue in RA, alongside treatments that target joint inflammation.

TRIAL REGISTRATION

Clinicaltrials.gov NCT04515589 . Date of registration 17 August 2020.

Associations of serum cytokines and chemokines with the risk of incident cancer in a prospective rheumatoid arthritis cohort

OBJECTIVES

We aimed to assess whether serum cytokine/chemokine concentrations predict incident cancer in RA patients.

METHODS

Data from cancer-free enrollees in the Veterans Affairs Rheumatoid Arthritis (VARA) Registry were linked to a national VA oncology database and the National Death Index (NDI) to identify incident cancers. Seventeen serum cytokines/chemokines were measured from enrollment serum and an overall weighted cytokine/chemokine score (CK score) was calculated. Associations of cytokines/chemokines with all-site, lung, and lymphoproliferative cancers were assessed in Cox regression models accounting for relevant covariates including age, sex, RA disease activity, and smoking.

RESULTS

In 1216 patients, 146 incident cancers (42 lung and 23 lymphoproliferative cancers) occurred over 10,072 patient-years of follow-up with a median time of 4.6 years from enrollment (cytokine/chemokine measurement) to cancer incidence. In fully adjusted models, CK score was associated with a higher risk of all-site (aHR 1.32, 95% CI 1.01-1.71, p < 0.001), lung (aHR 1.81, 1.40-2.34, p = 0.001), and lung/lymphoproliferative (aHR 1.54 [1.35-1.75], p < 0.001) cancer. The highest quartile of CK score was associated with a higher risk of all-site (aHR 1.91, 0.96-3.81, p = 0.07; p-trend = 0.005), lung (aHR 8.18, 1.63-41.23, p = 0.01; p-trend < 0.001), and lung/lymphoproliferative (aHR 4.56 [1.84-11.31], p = 0.001; p-trend < 0.001) cancer. Thirteen of 17 individual analytes were associated with incident cancer risk.

CONCLUSION

Elevated cytokine/chemokine concentrations are predictive of future cancer in RA patients, particularly lung and lymphoproliferative cancers. These results suggest that the measurement of circulating cytokines/chemokines could be informative in cancer risk stratification and could provide insight into future cancer prevention strategies in RA, and possibly individuals without RA.

Peripheral arthritis and higher disease activity lead to more functional impairment in axial spondyloarthritis: Longitudinal analysis from ESPAXIA

OBJETIVE

The aim of this study was to investigate whether peripheral arthritis together with disease activity independently contribute to functional impairment over time in patients with axSpA and to evaluate if there are contextual factors modifying this relationship.

MATERIAL AND METHODS

Patients with axial spondyloarthritis from the ESPAXIA cohort were followed-up annually over a mean of 3.7 years. Physical function was assessed by the self-reported questionnaire BASFI, disease activity by ASDAS and peripheral arthritis was also recorded. Generalized estimating equations (GEE) were used to investigate longitudinal association between peripheral arthritis, ASDAS and BASFI as the outcome. Autoregressive models (adjusted for BASFI 1 year earlier) were run to allow for a truly longitudinal interpretation. Interactions between each of ASDAS and peripheral arthritis with contextual factors (age, gender, educational level, smoking, job type) were tested.

RESULTS

185 patients (77 % male, mean (SD) age 42 (13) years old and mean disease duration (SD) of 9.4 (9.6) years) were included. ASDAS and peripheral arthritis independently contributed to explaning BASFI over time. Contextual factors did not modify either of the relationships. A true longitudinal relation was proven with the autoregressive GEE model, showing that, adjusted for age, gender, spinal mobility and use of NSAIDs, an increase of one ASDAS unit led to a BASFI 0.48 units higher (ß 0.48 [95%CI 0.39, 0.57]), and the presence of peripheral arthritis, to a BASFI 0.44 units higher (ß 0.44 [95%CI 0.08, 0.8]).

CONCLUSION

Peripheral arthritis and higher disease activity independently lead to more functional impairment in axSpA over time. Contextual factors do not modify these relationships.

Nonserious Infections in Patients With Rheumatoid Arthritis: Results From the British Society for Rheumatology Biologics Register for Rheumatoid Arthritis

OBJECTIVE

To describe the frequency and predictors of nonserious infections (NSI) and compare incidence across biologic agents within the British Society for Rheumatology Biologics Register for Rheumatoid Arthritis (BSRBR-RA).

METHODS

The BSRBR-RA is a prospective observational cohort study. An NSI was defined as an infection that did not require hospitalization or intravenous therapy. Infections were captured from clinician questionnaires and patient diaries. Individuals were considered "at risk" from the date of initiation of biologic treatment for up to 3 years. Drug exposure was defined by agent: tumor necrosis factor inhibitor (TNFi), interleukin-6 (IL-6) inhibitor, B cell depletion (rituximab), or conventional synthetic disease-modifying antirheumatic drugs (csDMARDs) alone. A multiple-failure Cox model was used with multivariable adjustment. Missing data were addressed using multiple imputation.

RESULTS

There were 17,304 NSI in 8,145 patients, with an event rate of 27.0 per person per year (95% confidence interval [95% CI] 26.6-27.4). Increasing age, female sex, comorbidity burden, glucocorticoid therapy, higher Disease Activity Score in 28 joints, and higher Health Assessment Questionnaire disability index were associated with an increased risk of NSI. There was a significant reduction in NSI risk with csDMARDs compared to biologic treatments. Compared to TNFi, IL-6 inhibition and rituximab were associated with a higher NSI risk (adjusted hazard ratio 1.45 [95% CI 1.29-1.63] and adjusted hazard ratio 1.28 [95% CI 1.14-1.45], respectively), while the csDMARD cohort had a lower risk (adjusted hazard ratio 0.64 [95% CI 0.59-0.70]). Within the TNFi class, adalimumab was associated with a higher NSI risk than etanercept (adjusted hazard ratio 1.11 [95% CI 1.05-1.17]).

CONCLUSION

NSI occur frequently in RA, and predictors mirror those reported with serious infections. All biologics are associated with a greater risk of NSI, with differences observed between agents. While unmeasured confounding must be considered, the magnitude of effect is large, and a relationship between NSI and targeted immunomodulatory therapy likely exists.

Serious infections in ANCA-associated vasculitides in the biologic era: real-life data from a multicenter cohort of 162 patients

BACKGROUND

Serious infections (SI) are common in patients with ANCA-associated vasculitides (AAV) like granulomatosis with polyangiitis (GPA) and microscopic polyangiitis (MPA). Real-life data regarding their incidence and predisposing factors-after the introduction of B cell depleting agents-are limited while data quantifying the risk per treatment modality and year of the disease are missing. Here, we aim to describe in details the incidence and the risk factors for SI in a contemporary AAV cohort.

METHODS

Multicenter, observational, retrospective study of AAV patients followed in three tertiary referral centers.

RESULTS

We included 162 patients with GPA (63%) and MPA (37%), males 51.9%, mean age 60.9 years, ΑΝCA+ 86%, and generalized disease 80%. During follow-up (891.2 patient-years, mean 5.4 years), 67 SI were recorded in 50 patients at an incidence rate of 7.5 per 100 patient-years. The SI incidence rate was higher during induction with cyclophosphamide (CYC) compared to rituximab (RTX, 19.3 vs. 11.3 per 100 patient-years, respectively) while it was lower and comparable between RTX and other regimens (5.52 vs. 4.54 per 100 patient-years, respectively) in the maintenance phase. By multivariate analysis, plasmapheresis (PLEX) and/or dialysis was a strong predictor for an SI during the 1st year after diagnosis (OR = 3.16, 95% CI 1.001-9.96) and throughout the follow-up period (OR = 5.21, 95% CI 1.93-14.07). In contrast, a higher baseline BVAS (OR = 1.11, 95% CI 1.01-1.21) was associated with SI only during the 1st year.

CONCLUSIONS

In this real-life study of patients with AAV, the SI incidence was higher during CYC compared to RTX induction while there was no difference between RTX and other agents used for maintenance therapy. Higher disease activity at baseline and need for PLEX and/or dialysis were independent factors associated with an SI.

Burden and trajectory of multimorbidity in rheumatoid arthritis: a matched cohort study from 2006 to 2015

OBJECTIVES

To compare the onset and trajectory of multimorbidity between individuals with and without rheumatoid arthritis (RA).

METHODS

A matched, retrospective cohort study was completed in a large, US commercial insurance database (MarketScan) from 2006 to 2015. Using validated algorithms, patients with RA (overall and incident) were age-matched and sex-matched to patients without RA. Diagnostic codes for 44 preidentified chronic conditions were selected to determine the presence (≥2 conditions) and burden (count) of multimorbidity. Cross-sectional comparisons were completed using the overall RA cohort and conditional logistic and negative binomial regression models. Trajectories of multimorbidity were assessed within the incident RA subcohort using generalised estimating equations.

RESULTS

The overall cohort (n=277 782) and incident subcohort (n=61 124) were female predominant (76.5%, 74.1%) with a mean age of 55.6 years and 54.5 years, respectively. The cross-sectional prevalence (OR 2.29, 95% CI 2.25 to 2.34) and burden (ratio of conditions 1.68, 95% CI 1.66 to 1.70) of multimorbidity were significantly higher in RA than non-RA in the overall cohort. Within the incident RA cohort, patients with RA had more chronic conditions than non-RA (β 1.13, 95% CI 1.10 to 1.17), and the rate of accruing chronic conditions was significantly higher in RA compared with non-RA (RA × follow-up year, β 0.21, 95% CI 0.20 to 0.21, p<0.001). Results were similar when including the pre-RA period and in several sensitivity analyses.

CONCLUSIONS

Multimorbidity is highly prevalent in RA and progresses more rapidly in patients with RA than in patients without RA during and immediately following RA onset. Therefore, multimorbidity should be aggressively identified and targeted early in the RA disease course.

The Impact of Asthma and Chronic Obstructive Pulmonary Disease (COPD) on Patient-Reported Outcomes in Systemic Lupus Erythematosus (SLE)

Background

Risk of asthma and chronic obstructive pulmonary disease (COPD) may be elevated in systemic lupus erythematosus (SLE), but little research has studied the impact of these conditions on SLE outcomes. We examined prevalence, incidence, and impact of self‐reported asthma and COPD in two US‐based SLE cohorts (FORWARD and Lupus Outcomes Study [LOS]).

Methods

Prevalence of asthma and COPD were defined as presence of conditions at individuals’ first interviews; incidence was defined as new reports over the next 3 years. Cross‐sectional associations of asthma/COPD with patient‐reported outcomes (PROs) and longitudinal analyses associations with asthma/COPD at entry with PROs 3 years later were examined.

Results

In FORWARD, 19.8% and 8.3% participants reported asthma and COPD, respectively, at entry. In LOS, 36.0% reported the presence of either (US population comparisons: asthma, 9.7%; COPD, 6.1%). Cross‐sectionally, asthma/COPD was associated with worse PROs, including disease activity. In FORWARD, individuals with asthma experienced greater worsening of fatigue, pain, and global health ratings longitudinally; individuals with COPD experienced greater increases in self‐reported SLE activity. However, no such patterns were noted in the LOS.

Conclusion

Asthma and COPD appeared to be more common in SLE than in the general US population and were associated with worse status on PROs cross‐sectionally. Asthma was linked to decrements in PROs longitudinally.

Addressing Health Literacy Needs in Rheumatology: Which Patient Health Literacy Profiles Need the Attention of Health Professionals?

Objective

To identify and describe health literacy profiles of patients with rheumatic diseases and explore whether the identified health literacy profiles can be generalized to a broader rheumatology context.

Methods

Patients with rheumatoid arthritis, spondyloarthritis, and gout from 3 hospitals in different regions in The Netherlands completed the Health Literacy Questionnaire (HLQ). Hierarchical cluster analysis was used to identify patients’ health literacy profiles based on 9 HLQ domains. A multinomial regression model with the identified health literacy profiles as the dependent variable was fitted to assess whether patients with a given disease type or attending a given hospital were more likely to belong to a specific profile.

Results

Among 895 participating patients, the lowest mean HLQ domain scores (indicating most difficulty) were found for “critical appraisal,” “navigating the health system,” and “finding good health information.” The 10 identified profiles revealed substantial diversity in combinations of strengths and weaknesses. While 42% of patients scored moderate to high on all 9 domains (profiles 1 and 3), another 42% of patients (profiles 2, 4, 5, and 6) clearly struggled with 1 or several aspects of health literacy. Notably, 16% (profiles 7–10) exhibited difficulty across a majority of health literacy domains. The probability of belonging to one of the profiles was independent of the hospital where the patient was treated or the type of rheumatic disease.

Conclusion

Ten distinct health literacy profiles were identified among patients with rheumatic diseases, independent of disease type and treating hospital. These profiles can be used to facilitate the development of health literacy interventions in rheumatology.

Is background methotrexate advantageous in extending TNF inhibitor drug survival in elderly patients with rheumatoid arthritis? An analysis of the British Society for Rheumatology Biologics Register

Objective

To evaluate drug survival with monotherapy compared with combination therapy with MTX in RA older adults.

Methods

Patients from the British Society for Rheumatology Biologics Register, a prospective observational cohort, who were biologic naïve and commencing their first TNF inhibitors (TNFi) were included. The cohort was stratified according to age: <75 and ≥75. Cox-proportional hazards models compared the risk of TNFi discontinuation from (i) any-cause, (ii) inefficacy and (iii) adverse events, between patients prescribed TNFi-monotherapy compared with TNFi MTX combination.

Results

The analysis included 15 700 patients. Ninety-five percent were <75 years old. Comorbidity burden and disease activity were higher in the ≥75 cohort. Fifty-two percent of patients discontinued TNFi therapy during the follow-up period. Persistence with therapy was higher in the <75 cohort. Patients receiving TNFi monotherapy were more likely to discontinue compared with patients receiving concomitant MTX [hazard rate 1.12 (1.06–1.18) P <0.001]. This finding only held true in patients <75 [hazard rate (HR) 1.11 (1.05–1.17) vs ≥75 [HR 1.13 (0.90–1.41)]. Examining TNFi discontinuation by cause revealed patients ≥75 receiving TNFi monotherapy were less likely to discontinue TNFi due to inefficacy [HR 0.66 (0.43–0.99) P=0.04] and more likely to discontinue therapy from adverse events [HR 1.41(1.02–1.96) P =0.04]. These results were supported by the multivariate adjustment in complete case and imputed analyses.

Conclusion

TNFi monotherapy is associated with increased treatment failure. In older adults, the disadvantage of TNFi monotherapy on drug survival is no longer seen. Patients ≥75 have fewer discontinuations due to inefficacy than adverse events compared with younger patients. This likely reflects greater disposition to toxicity but perhaps also a decline in immunogenicity associated with immunosenescence.

Relationship Between Depression and Disease Activity in United States Veterans With Early Rheumatoid Arthritis Receiving Methotrexate

OBJECTIVE

Depression is common in patients with rheumatoid arthritis (RA), exacerbates disease activity, and may decrease response to first-line disease-modifying antirheumatic drugs. This study aimed to determine if depression affects disease activity among veterans with early RA prescribed methotrexate (MTX).

METHODS

Participants included veterans enrolled in the Veterans Affairs Rheumatoid Arthritis (VARA) registry with early RA (onset < 2 yrs) prescribed MTX. Depression was assessed at enrollment using the International Classification of Diseases, 9th revision codes (296.2-296.39, 300.4, 311). Disease activity was measured using the Disease Activity Score in 28 joints (DAS28) and other core measures of RA disease activity. Propensity score weights were used to adjust depressed (n = 48) and nondepressed (n = 220) patients on baseline confounders within imputed datasets. Weighted estimating equations were used to assess standardized mean differences in disease activity between depressed and nondepressed patients at 6-month, 1-year, and 2-year follow-ups.

RESULTS

The analytic sample was composed of 268 veterans with early RA prescribed MTX who were predominantly male (n = 239, 89.2%) and older (62.7 yrs, SD 10.6) than patients with RA in the general population. Adjusted estimates indicated that depression was associated with significantly higher DAS28 at 6 months (β 0.35, 95% CI 0.01-0.68) but not at the 1- or 2-year follow-up. Also, depression was associated with significantly worse pain at 6 months (β 0.39, 95% CI 0.04-0.73) and 1 year (β 0.40, 95% CI 0.04-0.75).

CONCLUSION

In early RA, depression is associated with greater short-term disease activity during MTX treatment, as well as more persistent and severe pain.

Multimorbidity and Fatigue in Rheumatoid Arthritis: A Cross-Sectional Study of a Population-Based Cohort

Introduction

The objective was to evaluate the relationships between multimorbidity and overall fatigue as well as fatigue subdomains in patients with rheumatoid arthritis (RA).

Methods

A cross-sectional study of a population-based cohort of patients with RA was performed. Fatigue was assessed using the Bristol Rheumatoid Arthritis Fatigue Multidimensional Questionnaire (BRAF-MDQ). Patients’ medical records were reviewed for 25 chronic comorbidities prior to the BRAF-MDQ. Linear and logistic regression models were used to estimate the differences in BRAF-MDQ total and subdomain (physical, living, cognitive, and emotional) scores associated with multimorbidity, adjusting for age, sex, disease duration, obesity, smoking, C-reactive protein, and RA autoantibodies. Higher BRAF-MDQ scores indicate greater fatigue severity.

Results

The cohort included 192 patients, median age 62 years, and median RA duration 13 years. Multimorbidity was common with 93 (48%) having ≥ 2 comorbidities, and 27 (14%) having ≥ 4 comorbidities. The median BRAF-MDQ total score was 9 (interquartile range 3–18), with higher scores indicating greater fatigue. Patients with ≥ 4 comorbidities had higher total BRAF-MDQ scores (median 16.5, interquartile range: 6.8–24.8) than patients with < 4 comorbidities (7.5, 2.8–16.0; p = 0.014). Each additional comorbidity was associated with a 2.33 (95% confidence interval [CI] 1.10–3.56) unit increase in total BRAF-MDQ score (p < 0.001), and the presence of ≥ 4 comorbidities was associated with a 9.33 (95% CI 3.92–14.7) unit increase in total BRAF-MDQ score. Multimorbidity was significantly associated with all four fatigue subdomains in adjusted models.

Conclusions

Multimorbidity is associated with increased fatigue in patients with RA. The findings suggest that interventions targeting multimorbidity could help alleviate treatment-refractory fatigue in patients with RA and other rheumatic diseases.

Electronic Supplementary Material

The online version of this article (10.1007/s40744-020-00247-y) contains supplementary material, which is available to authorized users.

Empirical evidence of disease activity thresholds used to indicate need for major therapeutic change in US veterans with rheumatoid arthritis

Background

A previous analysis of the Veterans Affairs Rheumatoid Arthritis (VARA) registry showed that more than half of the patients with rheumatoid arthritis (RA) did not receive a major therapeutic change (MTC) despite moderate or severe disease activity. We aimed to empirically determine disease activity thresholds associated with a decision by rheumatologists and nurse practitioners to institute a MTC in patients with RA and to report the impact of that change on RA disease activity.

Methods

We analyzed data from the VARA registry between January 1, 2006, and September 30, 2017. Eligible patients had a visit with 3 disease activity measures (DAMs) recorded: Disease Activity Score for 28 joints (DAS28), Clinical Disease Activity Index (CDAI), and Routine Assessment of Patient Index Data 3 (RAPID3). The Youden Index was used to identify disease activity thresholds that best discriminated rheumatologist/nurse practitioner decision to initiate MTC. Clinical outcome was 20% improvement in the American College of Rheumatology criteria (ACR20 response). The effect of MTC on ACR20 response was presented as crude descriptive statistics and evaluated using G-computation for marginal and conditional effects with established disease activity level combined with an empirical threshold from Youden analysis.

Results

The study population comprised 1776 patients (12,094 visits: 3077 with MTC, 9017 without MTC). Empirical thresholds (95% bootstrap confidence interval with 1000 replications) for MTC were 4.03 (3.70–4.36) for DAS28, 12.9 (10.4–15.4) for CDAI, and 3.81 (3.32–4.30) for RAPID3. Visits with MTC had increased likelihood of ACR20 response: risk ratios for ACR20 response for visits with MTC vs without MTC ranged 1.2–2.6 across DAMs; risk differences ranged 0.2–14.5%.

Conclusions

MTC was associated with clinical improvement across all DAMs with the greatest change in patients with RA disease activity above the Youden threshold identified in this work.

Trial registration

VARA Registry, https://www.hsrd.research.va.gov/research/abstracts.cfm?Project_ID=2141698764

Multimorbidity and comorbidity in psoriatic arthritis - a perspective

INTRODUCTION

Psoriatic Arthritis (PsA) is a multifaceted disease in which various musculoskeletal and skin manifestations are involved. Beyond these features, PsA is associated with comorbidities that might increase the burden of the disease.

AREAS COVERED

In the last years a growing interest has come out for the concept of multimorbidity in rheumatology. Multimorbidity was defined as the 'co-existence of two or more chronic diseases in the same individual.' In the multimorbidity concept, the patient is of central concern and all coexisting diseases are of equal importance. Comorbidity was defined as the 'occurrence of any distinct additional entity during the clinical course of patient who has the index disease under study.' In PsA, comorbidity and multimorbidity have often been confusingly used interchangeably, showing that there is an unmet need on this topic.

EXPERT OPINION

This perspective article dealt with these different visions of the co-existence of other diseases in PsA, providing a distinction between them, not only for the impact on the treatment decision but also in how this concept might be incorporated into clinical trials design, choosing the right outcome measures for the patient-centric concept of multimorbidity. For this perspective, the authors searched PubMed and the Cochrane library for articles published.

Psoriatic arthritis and depressive symptoms: does systemic inflammation play a role?

OBJECTIVES

Depression is commonly associated with psoriatic arthritis (PsA), but its risk factors in these patients are largely unrecognized. Pro-inflammatory cytokines involved in the pathogenesis of PsA have been associated with depression in patients without autoimmune diseases. The aim of this study was to establish whether PsA patients with and without depressive symptoms differed for general or clinical variables and serum cytokines milieu.

METHODS

One hundred and fifty consecutive patients with PsA were screened for depressive symptoms with Hospital Anxiety and Depression Scale (HADS-D). Patients with and without depressive symptoms were compared according to the prevalence of general risk factors for depression, comorbidities, PsA features and serum IL-6, TNF-α, and IL-17A.

RESULTS

Fifty-eight patient (38.7%) had a depressive mood. Depressive symptoms were associated with female sex (p = 0.03) and current smoking (p = 0.05). Patients with and without depressive symptoms did not differ for general risk factors for depression and comorbidities. Depressed patients had more frequently psoriatic nail disease (p = 0.02) and significant physical disability (HAQ-DI ≥ 0.5) (p < 0.01) and were more frequently in moderate or high disease activity according to DAPSA score (p = 0.01). Depressed patients had higher serum IL-6 (p < 0.01) and comparable serum IL-17A and TNF-α. A cutoff of 2.27 pg/ml of serum IL-6 had the best ability to predict an HADS-D ≥ 8 (AUC 0.666 ± 0.044; p < 0.01). Multivariate logistic regression analysis confirmed that serum IL-6 ≥ 2.27 pg/ml was independently associated with depressive symptoms (OR 3.5; CI 1.6-7.8; p < 0.01).

CONCLUSIONS

Higher serum Il-6 is associated with depressive symptoms. This association suggests a direct role of systemic inflammation in the modulation of mood in PsA patients. Key Points • High PsA disease activity and physical disability are associated with depression. • Higher serum levels of IL-6 are independently associated with depression in PsA. • IL-6 might play a direct role in the development of depression in PsA patients.

Posttraumatic Stress Disorder, Depression, Anxiety, and Persistence of Methotrexate and TNF Inhibitors in Patients with Rheumatoid Arthritis

OBJECTIVE

To examine the relationship of posttraumatic stress disorder (PTSD) with earlier treatment discontinuation and medication adherence in US veterans with rheumatoid arthritis (RA).

METHODS

Veterans Affairs (VA) administrative data (2005-2014) were used to define unique dispensing episodes of methotrexate (MTX) and tumor necrosis factor inhibitors (TNFi) for veterans with RA. Diagnosis codes were used to categorize patients into mutually exclusive groups: PTSD (with/without depression/anxiety), depression/anxiety without PTSD, and neither psychiatric diagnosis. Multivariable Cox proportional hazards models were used to evaluate associations between psychiatric diagnoses and time to disease-modifying antirheumatic drug discontinuation (lapse in refill >90 days). Multivariable logistic regression was used to examine associations of diagnoses with medication nonadherence (proportion of days covered <0.8).

RESULTS

There were 15 081 dispensing episodes of MTX and 8412 dispensing episodes of TNFi. PTSD was independently associated with a greater likelihood of earlier discontinuation of both MTX (hazard ratio [HR] 1.15 [1.10-1.21]) and TNFi (HR 1.20 [1.13-1.28]). Depression/anxiety had a comparable risk of discontinuation for both MTX (HR 1.14 [1.10-1.19]) and TNFi (HR 1.16 [1.10-1.22]). Depression/anxiety, but not PTSD, was associated with higher odds of MTX (odds ratio [OR] 1.12 [1.03-1.22]) and TNFi (OR 1.14 [1.02-1.27]) nonadherence.

CONCLUSION

Veterans with RA and comorbid PTSD, depression, or anxiety had poor persistence of MTX and TNFi therapies. These results suggest that earlier discontinuation and low adherence to therapy among patients with RA with these psychiatric comorbidities may contribute to worse disease outcomes. Mechanisms by which these comorbidities contribute to lower adherence deserve further investigation and may lead to targeted interventions to improve disease outcomes.

The effect on work presenteeism of job retention vocational rehabilitation compared to a written self-help work advice pack for employed people with inflammatory arthritis: protocol for a multi-centre randomised controlled trial (the WORKWELL trial)

Background

Work problems are common in people with inflammatory arthritis. Up to 50% stop work within 10 years due to their condition and up to 67% report presenteeism (i.e. reduced work productivity), even amongst those with low disease activity. Job retention vocational rehabilitation (JRVR) may help prevent or postpone job loss and reduce presenteeism through work assessment, work-related rehabilitation and enabling job accommodations. This aims to create a better match between the person’s abilities and their job demands. The objectives of the Workwell trial are to test the overall effectiveness and cost-effectiveness of JRVR (WORKWELL) provided by additionally trained National Health Service (NHS) occupational therapists compared to a control group who receive self-help information both in addition to usual care.

Methods

Based on the learning from a feasibility trial (the WORK-IA trial: ISRCTN76777720), the WORKWELL trial is a multi-centre, pragmatic, individually-randomised parallel group superiority trial, including economic evaluation, contextual factors analysis and process evaluation. Two hundred forty employed adults with rheumatoid arthritis, undifferentiated inflammatory arthritis or psoriatic arthritis (in secondary care), aged 18 years or older with work instability will be randomised to one of two groups: a self-help written work advice pack plus usual care (control intervention); or WORKWELL JRVR plus a self-help written work advice pack and usual care. WORKWELL will be delivered by occupational therapists provided with additional JRVR training from the research team. The primary outcome is presenteeism as measured using the Work Limitations Questionnaire-25. A comprehensive range of secondary outcomes of work, health, contextual factors and health resource use are included. Outcomes are measured at 6- and 12- months (with 12-months as the primary end-point). A multi-perspective within-trial cost-effectiveness analyses will also be conducted.

Discussion

This trial will contribute to the evidence base for provision of JRVR to people with inflammatory arthritis. If JRVR is found to be effective in enabling people to keep working, the findings will support decision-making about provision of JRVR by rheumatology teams, therapy services and healthcare commissioners, and providing evidence of the effectiveness of JRVR and the economic impact of its implementation.

Trial registration

Clinical Trials.Gov: NCT03942783. Registered 08/05/2019 (https://clinicaltrials.gov/ct2/show/NCT03942783); ISRCTN Registry: ISRCTN61762297. Registered:13/05/2019 (http://www.isrctn.com/ISRCTN61762297). Retrospectively registered.

Health Assessment Questionnaire at One Year Predicts All-Cause Mortality in Patients With Early Rheumatoid Arthritis

OBJECTIVE

Higher self-reported disability (high Health Assessment Questionnaire [HAQ] score) has been associated with hospitalizations and mortality in established rheumatoid arthritis (RA), but associations in early RA are unknown.

METHODS

Patients with early RA (symptom duration <1 year) enrolled in the Canadian Early Arthritis Cohort who initiated disease-modifying antirheumatic drugs and had completed HAQ data at baseline and 1 year were included in the study. Discrete-time proportional hazards models were used to estimate crude and multi-adjusted associations of baseline HAQ and HAQ at 1 year with all-cause mortality in each year of follow-up.

RESULTS

A total of 1,724 patients with early RA were included. The mean age was 55 years, and 72% were women. Over 10 years, 62 deaths (3.6%) were recorded. Deceased patients had higher HAQ scores at baseline (mean ± SD 1.2 ± 0.7) and at 1 year (0.9 ± 0.7) than living patients (1.0 ± 0.7 and 0.5 ± 0.6, respectively; P < 0.001). Disease Activity Score in 28 joints (DAS28) was higher in deceased versus living patients at baseline (mean ± SD 5.4 ± 1.3 versus 4.9 ± 1.4) and at 1 year (mean ± SD 3.6 ± 1.4 versus 2.8 ± 1.4) (P < 0.001). Older age, male sex, lower education level, smoking, more comorbidities, higher baseline DAS28, and glucocorticoid use were associated with mortality. Contrary to HAQ score at baseline, the association between all-cause mortality and HAQ score at 1 year remained significant even after adjustment for confounders. For baseline HAQ score, the unadjusted hazard ratio (HR) was 1.46 (95% confidence interval [95% CI] 1.02-2.09), and the adjusted HR was 1.25 (95% CI 0.81-1.94). For HAQ score at 1 year, the unadjusted HR was 2.58 (95% CI 1.78-3.72), and the adjusted HR was 1.75 (95% CI 1.10-2.77).

CONCLUSION

Our findings indicate that higher HAQ score and DAS28 at 1 year are significantly associated with all-cause mortality in a large early RA cohort.

Dose tapering of biologic agents in patients with rheumatoid arthritis-results from a cohort study in Germany

OBJECTIVE

To assess the association of demographic and clinical factors with the clinical decision of tapering biologic disease modifying antirheumatic drugs (bDMARDs) in patients with rheumatoid arthritis (RA) in daily practice.

METHODS

All RA patients receiving bDMARDs were documented by 14 rheumatologists when presenting in 9 specialized private practices. Statistical analyses employed multivariable logistic models for dose reduction with the covariates age, gender, disease duration until bDMARD start, smoking status, disease activity, comorbidity, functional capacity, radiographic damage, concomitant methotrexate (MTX) treatment, rheumatoid factor positivity, and glucocorticoid use. In the multivariable model (MVM), missing values were imputed.

RESULTS

Data of 586 RA patients on bDMARD treatment were available, 171 of which (29%) received a reduced dose. The highest rates of patients with dose reduction were seen for rituximab (67%) and infliximab (50%). The degree of dose reduction was most prominent for rituximab (57%). In the MVM, 6/11 covariates were significantly associated with dose reduction: age (odds ratio (OR) 1.03, 95% confidence interval (CI) 1.01-1.05; P = 0.002), time between disease onset and bDMARD start (OR 1.03, 95% CI 1.01-1.06; P = 0.015), DAS 28 < 2.6 (OR 1.55, 95% CI 1.01-2.37; P = 0.045), MTX therapy (OR 1.52, 95% CI 1.03-2.25; P = 0.036), comorbidity (OR 1.20, 95% CI 1.01-1.42; P = 0.036), and glucocorticoid dose (OR 0.82, 95% CI 0.76-0.89; P < 0.001).

CONCLUSION

DAS 28 remission, concomitant MTX, and lower glucocorticoid doses were positively associated with dose tapering of bDMARDs in RA patients. While this could be expected, the reason for the association with age, comorbidity, and the time between disease onset and bDMARD start is less clear. Key points • In rheumatology practice, tapering of biologic disease modifying antirheumatic drugs is feasible in nearly 30% of patients with rheumatoid arthritis. • The degree of dose reduction may exceed 50% of the recommended dose. • In a multivariable model, concomitant methotrexate is positively associated with dose tapering of biologic disease modifying antirheumatic drugs.

Validation of the self-administered comorbidity questionnaire adjusted for spondyloarthritis: results from the ASAS-COMOSPA study

Objective

To confirm validity of the Self-administered Comorbidity Questionnaire modified for patients with SpA (mSCQ), and assess whether validity improves when adding items on extra-articular manifestations (EAMs), i.e. uveitis, psoriasis, and IBD, and osteoporosis and fractures.

Methods

Data from the Assessment in SpondyloArthritis international Society COMOrbidities in SPondyloArthritis study were used. Criterion validity of presence of EAMs, osteoporosis and fractures was assessed as agreement (kappa) between patients’ self-reported and physician-confirmed disease. Construct validity of the mSCQ including EAMs, osteoporosis and/or fractures (SpA-SCQ) was assessed by testing hypotheses about correlations with demographics, physical function, work ability, health utility and disease activity, and was compared with construct validity of the rheumatic disease comorbidity index.

Results

In total, 3984 patients contributed to the analyses. Agreement between patient-reported and physician-reported EAMs was substantial to almost perfect (uveitis ĸ = 0.81, IBD ĸ = 0.73, psoriasis ĸ = 0.86). Agreement for osteoporosis (ĸ = 0.38) and fractures (ĸ = 0.39) was fair. As hypothesized, the mSCQ correlated moderately to weakly with age, physical function, work limitations and health utility, and very weakly with disease activity. In contrast to our hypothesis, adding EAMs, osteoporosis and/or fractures to the mSCQ decreased correlations with several external constructs, especially among patients with peripheral SpA. Correlations with the different constructs were stronger for the both mSCQ and SpA-SCQ (r_BASFI = 0.34; r_EQ-5D = −0.33) compared with the rheumatic disease comorbidity index (r_BASFI = 0.24; r_EQ-5D = −0.21).

Conclusion

The mSCQ is a valid self-report instrument to assess the influence of comorbidities on health outcomes in patients with SpA. Adding EAMs and/or osteoporosis or fractures does not improve validity of the mSCQ.

Rheumatoid Arthritis as a Risk Factor for Coronary Artery Calcification and Obstructive Coronary Artery Disease in Patients with Chest Pain: A Registry Based Cross-Sectional Study

Purpose

To examine the occurrence and severity of coronary artery disease (CAD) in patients with rheumatoid arthritis (RA) compared to non-RA patients in a population referred for coronary computed tomography angiography (CTA) due to chest pain.

Patients and Methods

In this cross-sectional study, 46,210 patients from a national CTA database were included. Patients with RA were stratified on serology, treatment with conventional synthetic or biological disease-modifying antirheumatic drugs (DMARDs), and the need for relapse or flare treatment with intraarticular or -muscular glucocorticoid injections (GCIs). Primary outcomes were coronary artery calcium score (CACS) >0 and CACS ≥400, and secondary outcome was obstructive CAD. Associations between RA and outcomes were examined using logistic regression and results were adjusted for age, sex, cardiovascular risk factors and comorbidities.

Results

A total of 395 (0.9%) RA patients were identified. In overall RA, crude odds ratio (OR) for having CACS >0 was 1.48 (1.21–1.82) and 1.52 (1.15–2.01) for CACS ≥400, whereas adjusted ORs were 1.08 (0.86–1.36) and 1.21 (0.89–1.65), respectively. Seropositive RA patients had adjusted OR of 1.16 (0.89–1.50) for CACS >0 and 1.37 (0.98–1.90) for CACS ≥400. Patients who had received ≥1 GCI in the period of 3 years prior to the CTA had an adjusted OR of 1.37 (0.94–2.00) for having CACS >0 and 1.46 (0.92–2.31) for CACS ≥400.

Conclusion

This is the first large-scale, CTA-based study examining the occurrence and severity of CAD in RA patients with symptoms suggestive of cardiovascular disease. A higher prevalence of coronary artery calcification was found in RA patients. After adjusting for age, sex, cardiovascular risk factors and comorbidities, the tendency was less pronounced. We found a trend for increased coronary calcification in RA patients being seropositive or needing treatment with GCI for a relapse or flare.

Trends in the Inpatient Burden of Coronary Artery Disease in Granulomatosis With Polyangiitis: A Study of a Large National Dataset

OBJECTIVE

Cardiovascular (CV) diseases are serious comorbidities in patients with granulomatosis with polyangiitis (GPA). In a sample of patients hospitalized for GPA, we sought to examine trends in the burden of coronary artery disease (CAD) and its 2 serious manifestations, acute myocardial infarction (AMI) and heart failure (HF).

METHODS

We used the National Inpatient Sample to conduct a retrospective cross-sectional analysis. Our sample consisted of hospitalizations for GPA between 2005 and 2014. We examined trends in the proportion of CAD, AMI, and HF in all hospitalizations with GPA compared to those without GPA. We used logistic regression adjusted for potential confounders and included interaction terms.

RESULTS

Among a total of 103,453 GPA hospitalizations, 20,351 (19.7%) hospitalizations had a concurrent diagnosis of CAD. GPA with CAD was associated with overall lower burden of traditional CV risk factors compared to non-GPA with CAD, with the exception of chronic kidney disease (57% vs 21%). Over the 10-year study period, there were rising trends in the inpatient burden of CAD (16.6% in 2005 to 22.7% in 2014) and CAD with HF (4.3% in 2005 to 9.9% in 2014), but not AMI (1.2% in 2005 to 1.1% in 2014), in GPA hospitalizations compared to non-GPA controls.

CONCLUSION

In this national sample of GPA hospitalizations, we found that the burden of CAD and CAD with HF was on the rise over the 10-year period compared to non-GPA; however, it was not the case for AMI.

Coexistent Hyperuricemia and Gout in Rheumatoid Arthritis: Associations With Comorbidities, Disease Activity, and Mortality

OBJECTIVE

Although hyperuricemia and gout can complicate the course of rheumatoid arthritis (RA), the impact of these factors on outcomes in RA is unclear. We undertook this study to examine associations of coexistent hyperuricemia and gout with RA disease measures, RA treatments, and survival.

METHODS

Participants from a longitudinal RA study were categorized by the presence of gout and serum urate (UA) status. Groups were compared by baseline patient characteristics, RA disease activity, treatments, and comorbidities. Associations of baseline serum UA levels with all-cause and cardiovascular disease (CVD)-related mortality were examined in multivariable survival analyses.

RESULTS

Of 1,999 participants with RA, 341 (17%) had serum UA concentrations of >6.8 mg/dl, and 121 (6.1%) were diagnosed with gout. There were no significant associations of serum UA concentration or gout with RA disease activity or treatment at enrollment, with the exception that those with gout were more likely to be receiving sulfasalazine and less likely to be receiving nonsteroidal antiinflammatory drugs. After adjustments for age and sex, moderate hyperuricemia (serum UA >6.8 to ≤8 mg/dl) was associated with an increased risk of CVD-related mortality (hazard ratio 1.56 [95% confidence interval 1.11-2.21]). This association was attenuated and not significant following additional adjustment for comorbidities that more commonly accompany hyperuricemia. Results corresponding with serum UA concentrations of >8.0 mg/dl were similar, although not reaching statistical significance in any model. There were no associations of baseline serum UA concentration with all-cause mortality.

CONCLUSION

Our study reports the frequency of hyperuricemia and gout in patients with RA. These results demonstrate strong associations of hyperuricemia with CVD mortality in this population, a risk that appears to be driven by excess comorbidity.

Experiences of Patients With Rheumatic Diseases in the United States During Early Days of the COVID-19 Pandemic

OBJECTIVE

Patients with rheumatic diseases such as rheumatoid arthritis (RA) and lupus have increased risk of infection and are treated with medications that may increase this risk yet are also hypothesized to help treat COVID-19. We set out to understand how the COVID-19 pandemic has impacted the lives of these patients in the United States.

METHODS

Participants in a US-wide longitudinal observational registry responded to a supplemental COVID-19 questionnaire by e-mail on March 25, 2020, about their symptoms, COVID-19 testing, health care changes, and related experiences during the prior 2 weeks. Analysis compared responses by diagnosis, disease activity, and new onset of symptoms. Qualitative analysis was conducted on optional free-text comment fields.

RESULTS

Of the 7061 participants invited to participate, 530 responded, with RA as the most frequent diagnosis (61%). Eleven participants met COVID-19 screening criteria, of whom two sought testing unsuccessfully. Six others sought testing, three of whom were successful, and all test results were negative. Not quite half of participants (42%) reported a change to their care in the prior 2 weeks. Qualitative analysis revealed four key themes: emotions in response to the pandemic, perceptions of risks from immunosuppressive medications, protective measures to reduce risk of COVID-19 infection, and disruptions in accessing rheumatic disease medications, including hydroxychloroquine.

CONCLUSION

After 2 weeks, many participants with rheumatic diseases already had important changes to their health care, with many altering medications without professional consultation or because of hydroxychloroquine shortage. As evidence accumulates on the effectiveness of potential COVID-19 treatments, effort is needed to safeguard access to established treatments for rheumatic diseases.

Prognostic value of comorbidity indices and lung diseases in early rheumatoid arthritis: a UK population-based study

OBJECTIVES

We assessed comorbidity burden in people with RA at diagnosis and early disease (3 years) and its association with early mortality and joint destruction. The association between lung disease and mortality in RA is not well studied; we also explored this relationship.

METHODS

From a contemporary UK-based population (n = 1, 475 762) we identified a cohort with incident RA (n = 6591). The prevalence of comorbidities at diagnosis of RA and at 3 years was compared with age- and gender-matched controls (n = 6591). In individuals with RA we assessed the prognostic value of the Charlson Comorbidity Index and Rheumatic Disease Comorbidity Index calculated at diagnosis for all-cause mortality and joint destruction (with joint surgery as a surrogate marker). We separately evaluated the association between individual lung diseases [chronic obstructive pulmonary disease (COPD), asthma and interstitial lung disease] and mortality.

RESULTS

Respiratory disease, cardiovascular disease, stroke, diabetes, previous fracture and depression were more common (P < 0.05) in patients with RA at diagnosis than controls. Comorbidity (assessed using RDCI) was associated with all-cause mortality in RA [adjusted hazard ratio (HR) 1.26, 95% CI 1.00-1.60]. There was no association with joint destruction. COPD, but not asthma, was associated with mortality (COPD HR 2.84, 95% CI 1.13-7.12).

CONCLUSION

There is an excess burden of comorbidity at diagnosis of RA including COPD, asthma and interstitial lung disease. COPD is a major predictor of early mortality in early RA. Early assessment of comorbidity including lung disease should form part of the routine management of RA patients.

Development and Implementation of a Pilot Registry for Monitoring the Efficacy and Safety of Novel Therapies in Patients with Systemic Lupus Erythematosus

The therapeutic armamentarium in Systemic Lupus Erythematosus (SLE) is expanding with the introduction of novel biologic and small-molecule agents. Complementary to randomized controlled trials, registry-based studies are advantageous due to the inclusion of a wider range of patients from daily practice and the potential for long-term monitoring of the efficacy and safety of therapies. Moreover, data from registries can be used to identify disease phenotypes that best respond to biologic agents, and to correlate clinical response with parameters such as co-administered therapies and comorbidities. In this project, we will use the configuration of the Hellenic Registry of Biologic Therapies for inflammatory arthritides in order to design a dedicated SLE module with variables pertaining to global and organ-specific disease activity, severity, flares, organ damage/outcome, comorbidities and adverse events. The second stage will involve the pilot implementation of this platform for the multicentric registration of SLE patients who are treated with belimumab. The significance lies in the development of a structured registry that enables the assessment of the disease burden and the long-term efficacy and safety of existing and future biological agents in SLE. Piloting the registry can serve as a basis for establishing nationwide collaborative efforts.

International Consortium for Health Outcome Measurement Set of Outcomes That Matter to People Living With Inflammatory Arthritis: Consensus From an International Working Group

Objective

The implementation of value‐based health care in inflammatory arthritis requires a standardized set of modifiable outcomes and risk‐adjustment variables that is feasible to implement worldwide.

Methods

The International Consortium for Health Outcomes Measurement (ICHOM) assembled a multidisciplinary working group that consisted of 24 experts from 6 continents, including 6 patient representatives, to develop a standard set of outcomes for inflammatory arthritis. The process followed a structured approach, using a modified Delphi process to reach consensus on the following decision areas: conditions covered by the set, outcome domains, outcome measures, and risk‐adjustment variables. Consensus in areas 2 to 4 were supported by systematic literature reviews and consultation of experts.

Results

The ICHOM Inflammatory Arthritis Standard Set covers patients with rheumatoid arthritis (RA), axial spondyloarthritis, psoriatic arthritis, and juvenile idiopathic arthritis (JIA). We recommend that outcomes regarding pain, fatigue, activity limitations, overall physical and mental health impact, work/school/housework ability and productivity, disease activity, and serious adverse events be collected at least annually. Validated measures for patient‐reported outcomes were endorsed and linked to common reporting metrics. Age, sex at birth, education level, smoking status, comorbidities, time since diagnosis, and rheumatoid factor and anti‐citrullinated protein antibody lab testing for RA and JIA should be collected as risk‐adjustment variables.

Conclusion

We present the ICHOM inflammatory arthritis Standard Set of outcomes, which enables health care providers to implement the value‐based health care framework and compare outcomes that are important to patients with inflammatory arthritis.

Comorbidity burden in axial spondyloarthritis: a cluster analysis

OBJECTIVES

To examine how comorbidities cluster in axial spondyloarthritis (axSpA) and whether these clusters are associated with quality of life, global health and other outcome measures.

METHODS

We conducted a cross-sectional study of consecutive patients meeting ASAS criteria for axSpA in Liverpool, UK. Outcome measures included quality of life (EQ5D), global health and disease activity (BASDAI). We used hierarchical cluster analysis to group patients according to 38 pre-specified comorbidities. In multivariable linear models, the associations between distinct comorbidity clusters and each outcome measure were compared, using axSpA patients with no comorbidities as the reference group. Analyses were adjusted for age, gender, symptom duration, BMI, deprivation, NSAID-use and smoking.

RESULTS

We studied 419 patients (69% male, mean age 46 years). 255 patients (61%) had at least one comorbidity, among whom the median number was 1 (range 1-6). Common comorbidities were hypertension (19%) and depression (16%). Of 15 clusters identified, the most prevalent clusters were hypertension-coronary heart disease and depression-anxiety. Compared with patients with no comorbidities, the fibromyalgia-irritable bowel syndrome cluster was associated with adverse patient-reported outcome measures; these patients reported 1.5-unit poorer global health (95%CI 0.01, 2.9), reduced quality of life (0.25-unit lower EQ5D; 95%CI -0.37, -0.12) and 1.8-unit higher BASDAI (95% CI 0.4, 3.3). Similar effect estimates were found for patients in the depression-anxiety cluster.

CONCLUSION

Comorbidity is common among axSpA patients. The two most common comorbidities were hypertension and depression. Patients in the depression-anxiety and fibromyalgia-IBS clusters reported poorer health and increased axSpA severity.

Investigating musculoskeletal health and wellbeing; a cohort study protocol

Background

In an ageing population, pain, frailty and disability frequently coexist across a wide range of musculoskeletal diagnoses, but their associations remain incompletely understood. The Investigating Musculoskeletal Health and Wellbeing (IMH&W) study aims to measure and characterise the development and progression of pain, frailty and disability, and to identify discrete subgroups and their associations. The survey will form a longitudinal context for nested research, permitting targeted recruitment of participants for qualitative, observational and interventional studies; helping to understand recruitment bias in clinical studies; and providing a source cohort for cohort randomised controlled trials.

Methods

IMH&W will comprise a prospective cohort of 10,000 adults recruited through primary and secondary care, and through non-clinical settings. Data collection will be at baseline, and then through annual follow-ups for 4 years. Questionnaires will address demographic characteristics, pain severity (0–10 Numerical Rating Scale), pain distribution (reported on a body Manikin), pain quality (McGill Pain Questionnaire), central aspects of pain (CAP-Knee), frailty and disability (based on Fried criteria and the FRAIL questionnaire), and fracture risk. Baseline characteristics, progression and associations of frailty, pain and disability will be determined. Discrete subgroups and trajectories will be sought by latent class analysis. Recruitment bias will be explored by comparing participants in nested studies with the eligible IMH&W population.

Discussion

IMH&W will elucidate associations and progression of pain, frailty and disability. It will enable identification of people at risk of poor musculoskeletal health and wellbeing outcomes who might be suitable for specific interventions, and facilitate generalisation and comparison of research outcomes between target populations. The study will benefit from a large sample size and will recruit from diverse regions across the UK. Purposive recruitment will enrich the cohort with people with MSK problems with high representation of elderly and unwell people.

Trial registration

Clinicaltrials.gov NCT03696134. Date of Registration: 04 October 2018.

Potential for Major Therapeutic Changes to Produce Significant Clinical Response Across a Broad Range of Disease Activity: An Observational Study of US Veterans With Rheumatoid Arthritis

OBJECTIVE

To examine the impact of major therapeutic change (MTC) on clinical response across a broad range of disease activity in US veterans with rheumatoid arthritis (RA).

METHODS

This historical cohort analysis evaluated patient visits from the Veterans Affairs RA registry between January 1, 2006 and September 30, 2017. Eligible patient visits were a rheumatology visit with 3 disease activity measures, including the Disease Activity Score in 28 joints, the Clinical Disease Activity Index, and the Routine Assessment of Patient Index Data 3; the follow-up visit for all 3 disease activity measures was 2-6 months later. The full population and a subset of patients with active disease (≥6 tender joints, ≥6 swollen joints) were evaluated. Clinical outcome was based on the American College of Rheumatology criteria for 20% improvement in disease activity (ACR20). The effect of MTC on ACR20 response was presented as crude descriptive statistics and evaluated using standardized regression for population- and disease activity-level conditional effects.

RESULTS

The full population comprised 1,208 patients (6,138 visits) and the active disease subpopulation included 383 patients (1,109 visits). Overall, visits with MTC were associated with increased likelihood of ACR20 response across all disease activity measures for the full population. Risk ratios for overall risk of ACR20 response for visits with MTC versus those without MTC ranged from 1.67 to 2.22 across disease activity measures among the full population and from 1.51 to 1.60 for the subpopulation with active disease.

CONCLUSION

MTC was associated with clinical improvement, even among patients with longstanding RA who had received multiple prior therapies, which emphasizes the utility of therapy modifications for patients with established and active RA.

Defining Pain That Does Not Interfere With Activities Among Rheumatoid Arthritis Patients

OBJECTIVE

The objectives of this study were to: 1) characterize the distribution of noninterfering pain (defined as the pain intensity level at which individuals can function without interference) across different aspects of life among patients with rheumatoid arthritis (RA), and 2) identify clinical characteristics associated with differing levels of noninterfering pain.

METHODS

Patients with RA in FORWARD, The National Databank for Rheumatic Diseases completed 8 items from the Patient-Reported Outcomes Measurement Information System (PROMIS) pain interference item bank that asked about interference with activities. If subjects reported pain interference, they were asked, "At what level would pain no longer interfere with this activity?" on a scale of 0 to 10. Subjects were also asked, "At what level of pain would you be able to do everything you want to do?" Multiple linear regression analyses examined associations between clinical characteristics and noninterfering pain.

RESULTS

A total of 3,949 patients with RA completed the questionnaires. Pain interference was most common for daily activities and least common for ability to concentrate. The mean ± SD level at which pain no longer interfered with activities ranged from 2.7 ± 2.1 for ability to fall/stay asleep to 3.1 ± 2.0 for social activities. Overall, the mean ± SD threshold for noninterfering pain was 2.8 ± 1.9. The mean ± SD level of pain at which patients could do everything they wanted to do was 2.3 ± 1.9. More severe pain intensity was associated with higher noninterfering pain.

CONCLUSION

The mean pain level that did not interfere with activities was 3. High pain intensity was associated with high self-reported noninterfering pain.

Changes in Alcohol Use and Associations With Disease Activity, Health Status, and Mortality in Rheumatoid Arthritis

OBJECTIVE

Better disease activity and quality of life have been observed among patients with rheumatoid arthritis (RA) who drink alcohol. This association might be explained by reverse causality. We undertook this study to identify predictors of change in alcohol use and to evaluate independent associations between alcohol use and RA activity and mortality.

METHODS

Participants in Forward, The National Databank for Rheumatic Diseases, were asked about alcohol use (any versus none), and disease activity was collected through the Patient Activity Scale-II (PAS-II) on semiannual surveys. We identified factors associated with changes in alcohol use and determined associations between alcohol use and disease activity and mortality using linear and logistic regression models, Cox proportional hazards models, and marginal structural models.

RESULTS

A total of 121,280 observations were studied among 16,762 unique participants. Discontinuation and initiation of alcohol were common among drinkers and abstainers (8.2% and 9.2% of observations, respectively). Greater discontinuation and less initiation were observed with greater disease activity, older age, female sex, nonwhite race, obesity, greater comorbidity, low quality of life, low educational level, low income, and work disability. While alcohol users had lower PAS-II (β = -0.15 [95% confidence interval (95% CI) -0.18, -0.11], P < 0.001) and a lower mortality (odds ratio 0.87 [95% CI 0.76, 0.98], P = 0.03) in traditional models, associations were not seen in marginal structural models.

CONCLUSION

Higher disease activity, disability, comorbidity, and poor quality of life contribute to reductions in alcohol use. Active use and changes in use were not associated with disease activity or mortality when adjusting for confounding, suggesting no clear benefit of alcohol consumption in RA.

Effectiveness of Tocilizumab in Patients with Rheumatoid Arthritis Is Unaffected by Comorbidity Burden or Obesity: Data from a US Registry

OBJECTIVE

Comorbidity burden and obesity may affect treatment response in patients with rheumatoid arthritis (RA). Few real-world studies have evaluated the effect of comorbidity burden or obesity on the effectiveness of tocilizumab (TCZ). This study evaluated TCZ effectiveness in treating RA patients with high versus low comorbidity burden and obesity versus nonobesity in US clinical practice.

METHODS

Patients in the Corrona RA registry who initiated TCZ were stratified by low or high comorbidity burden using a modified Charlson Comorbidity Index (mCCI) and by obese or nonobese status using body mass index (BMI). Improvements in disease activity and functionality after TCZ initiation were compared for the above strata of patients at 6 and 12 months after adjusting for statistically significant differences in baseline characteristics.

RESULTS

We identified patients with high (mCCI ≥ 2; n = 195) and low (mCCI < 2; n = 575) comorbidity burden and patients categorized as obese (BMI ≥ 30; n = 356) and nonobese (BMI < 30; n = 449) who were treated with TCZ. Most patients (> 95%) were biologic experienced and about one-third of patients received TCZ as monotherapy, with no significant differences between patients by comorbidity burden or obesity status. Improvement in disease activity and functionality at 6 and 12 months was similar between groups, regardless of comorbidity burden or obesity status.

CONCLUSION

In this real-world analysis, TCZ was frequently used to treat patients with high comorbidity burden or obesity. Effectiveness of TCZ did not differ by comorbidity or obesity status.

Development of comorbidity score for patients undergoing major surgery

OBJECTIVE

To develop and validate a claims-based comorbidity score for patients undergoing major surgery, and compare its performance with established comorbidity scores.

DATA SOURCE

Five percent Medicare data from 2007 to 2014.

STUDY DESIGN

Retrospective cohort study of patients aged ≥65 years undergoing six major operations (N = 99 250).

DATA COLLECTION

One-year mortality was the primary outcome. Secondary outcomes were hospital mortality, 30-day mortality, 30-day readmission, and length of stay. The comorbidity score was developed in the derivation cohort (70 percent sample) using logistic regression model. The comorbidity score was calibrated and validated in the validation cohort (30 percent sample), and compared against the Charlson, Elixhauser, and Centers for Medicare and Medicaid Services Hierarchical Condition Categories (CMS-HCC) comorbidity scores using c-statistic, net reclassification improvement, and integrated discrimination improvement.

PRINCIPAL FINDINGS

In the validation cohort, the surgery-specific comorbidity score was well calibrated and performed better than the Charlson, Elixhauser, and CMS-HCC comorbidity scores for all outcomes; the performance was comparable to the CMS-HCC for 30-day readmission. For example, the surgery-specific comorbidity score (c-statistic = 0.792; 95% CI, 0.785-0.799) had greater discrimination than the Charlson (c-statistic = 0.747; 95% CI, 0.739-0.755), Elixhauser (c-statistic = 0.747; 95% CI, 0.735-0.755), or CMS-HCC (c-statistic = 0.755; 95% CI, 0.747-0.763) scores in predicting 1-year mortality. The net reclassification improvement and integrated discrimination improvement were greater for surgery-specific comorbidity score compared to the Charlson, Elixhauser, and CMS-HCC scores.

CONCLUSIONS

Compared to commonly used comorbidity measures, a surgery-specific comorbidity score better predicted outcomes in the surgical population.

Initiation of Disease-Modifying Therapies in Rheumatoid Arthritis Is Associated With Changes in Blood Pressure

PURPOSE

This study reports the effect of disease-modifying therapies for rheumatoid arthritis (RA) on systolic and diastolic blood pressure (SBP, DBP) over 6 months and incident hypertension over 3 years in a large administrative database.

METHODS

We used administrative Veterans Affairs databases to define unique dispensing episodes of methotrexate, leflunomide, sulfasalazine, hydroxychloroquine, tumor necrosis factor inhibitors, and prednisone among patients with RA. Changes in SBP and DBP in the 6 months before disease-modifying antirheumatic drug initiation were compared with changes observed in the 6 months after initiation. The risk of incident hypertension within 3 years (new diagnosis code for hypertension and prescription for antihypertensive) was also assessed. Multivariable models and propensity analyses assessed the impact of confounding by indication.

RESULTS

A total of 37,900 treatment courses in 21,216 unique patients contributed data. Overall, there were no changes in SBP or DBP in 6 months prior to disease-modifying antirheumatic drug initiation (all P > 0.62). In contrast, there was a decline in SBP (β = -1.08 [-1.32 to -0.85]; P < 0.0001) and DBP (β = -0.48 [-0.62 to -0.33]; P < 0.0001) over the 6 months following initiation. The greatest decline was observed among methotrexate and hydroxychloroquine users. Methotrexate users were 9% more likely to have optimal blood pressure (BP) after 6 months of treatment. Patients treated with leflunomide had increases in BP and a greater risk of incident hypertension compared with patients treated with methotrexate (hazard ratio, 1.53 [1.21-1.91]; P < 0.001).

CONCLUSIONS

Blood pressure may improve with treatment of RA, particularly with methotrexate or hydroxychloroquine. Leflunomide use, in contrast, is associated with increases in BP and a greater risk of incident hypertension.

Real-World Adherence to Oral Methotrexate Measured Electronically in Patients With Established Rheumatoid Arthritis

Objective

To assess methotrexate (MTX) adherence using the Medication Event Monitoring System (MEMS) and characterize associations with adherence in patients with rheumatoid arthritis (RA).

Methods

Eligible patients participated in Forward, the National Databank for Rheumatic Diseases, and recently (12 months or sooner) initiated oral MTX. MEMS was used to compile MTX weekly dosing over 24 weeks. The Beliefs about Medicines Questionnaire (BMQ) was completed, and baseline demographics and disease characteristics obtained. MTX adherence (percentage of weeks dose taken correctly), implementation (percentage of weeks dose taken correctly from initiation until last dose), and persistence (duration from initiation to last dose) were calculated. Analyses measured associations between patient characteristics and adherence, modeled using logistic generalized estimating equations and censored Poisson regression, and persistence modeled using Cox regression.

Results

Overall, 60 of 119 eligible patients were included in the analysis. MTX adherence, implementation, and persistence were 75%, 80%, and 83%, respectively, at 24 weeks. Demographics and disease characteristics were generally similar between patients with 1 week or less and 2 weeks or more of missed MTX. Unemployment, less disability, higher Patient Global scores, and no prior disease‐modifying antirheumatic drug (DMARD) use were associated with correct dosing. No significant differences in adherence were observed between patients receiving concomitant MTX versus MTX monotherapy, and biologic DMARD‐experienced versus biologic DMARD‐naïve patients. Higher scores in BMQ Specific Necessity (indicating a greater belief in the necessity of the medication) was associated with a decreased likelihood of dosing at an interval shorter than prescribed (odds ratio 0.89).

Conclusion

Even in a participatory group over a short period, MTX adherence was suboptimal and associated with certain demographics, medication experience, and beliefs about medicines. This suggests a need for screening and alternative treatment opportunities in nonadherent MTX patients with RA.

Risk of Serious Infection in Patients With Rheumatoid Arthritis Treated With Biologic Versus Nonbiologic Disease-Modifying Antirheumatic Drugs

Objective

The objective of this study is to examine the risk of serious infections (SIs) associated with biological disease‐modifying antirheumatic drugs (bDMARDs) compared with conventional synthetic disease‐modifying antirheumatic drugs (csDMARDs) in patients with rheumatoid arthritis (RA).

Methods

We studied patients with RA who initiated bDMARDs or csDMARDs from 2001 to 2016 in FORWARD–The National Databank for Rheumatic Diseases. Disease‐modifying antirheumatic drugs (DMARDs) were categorized into three groups: (1) csDMARDs (bDMARD‐naïve; reference), (2) tumor necrosis factor α inhibitors (TNFis), and (3) non‐TNFi biologics (abatacept, rituximab, tocilizumab, and anakinra). SIs were defined as those requiring intravenous antibiotics or hospitalization or those resulting in death. We calculated the propensity score (PS), which reflected the probability of receiving a specific DMARD group, and estimated the hazard ratio (HR) (with the 95% confidence interval [CI]) for SI from multivariable Cox models, adjusting for PS and time‐varying confounders.

Results

A total of 694 (5.9%) first SIs were identified in 11 623 patients with RA during 27 552 patient‐years of follow‐up. The SI incidence rate per 1000 patient‐years was 22.4 (95% CI 19.2‐26.1) for csDMARDs, 26.9 (95% CI 24.5‐29.6) for TNFis, and 23.3 (95% CI 19.0‐28.5) for non‐TNFi bDMARDs. Adjusted HRs for SIs were 1.33 (95% CI 1.05‐1.68) for TNFis and 1.48 (95% CI 1.02‐2.16) for non‐TNFi bDMARDs, compared with csDMARDs. The SI risk with non‐TNFi bDMARDs versus TNFis was not different. Other risk factors for SI were older age, higher comorbidity burden (particularly pulmonary disease), higher weighted cumulative prednisone dose, disability and disease activity, and number of prior csDMARD failures.

Conclusion

TNFis and non‐TNFi bDMARDs were associated with an increased SI risk compared with csDMARDs in RA, even after accounting for risk‐associated patient characteristics.

Obesity, Weight Loss, and Progression of Disability in Rheumatoid Arthritis

OBJECTIVE

Cross-sectional studies have demonstrated that obese patients with rheumatoid arthritis (RA) often report greater disability. The longitudinal effects of obesity, however, are not well-characterized. We evaluated associations between obesity, weight loss, and worsening of disability in patients of 2 large registry studies, which included patients who were followed for longer periods of time.

METHODS

This study included patients with RA from the National Data Bank for Rheumatic Diseases (FORWARD) (n = 23,323) and the Veterans Affairs RA (VARA) registry study (n = 1,697). Results of the Health Assessment Questionnaire (HAQ) or Multidimensional HAQ (MD-HAQ) were recorded through follow-up. Significant worsening of disability was defined as an increase of >0.2 in HAQ or MD-HAQ scores. The Cox proportional hazards model was used to evaluate the risk of worsening of disability from baseline and to adjust for demographics, baseline disability, comorbidity, disease duration, and other disease features.

RESULTS

At enrollment, disability scores were higher among severely obese patients compared to those who were overweight both in FORWARD (β = 0.17 [95% confidence interval (95% CI) 0.14, 0.20]; P < 0.001) and in the VARA registry (β = 0.17 [95% CI 0.074, 0.27]; P = 0.001). In multivariable models, patients who were severely obese at enrollment had a greater risk of progressive disability compared to overweight patients in FORWARD (HR 1.25 [95% CI 1.18, 1.33] P < 0.001) and in the VARA registry (HR 1.33 [95% CI 1.07, 1.66]; P = 0.01). Weight loss following enrollment was also associated with a greater risk in both cohorts. In the VARA registry, associations were independent of other clinical factors, including time-varying C-reactive protein and swollen joint count.

CONCLUSION

Severe obesity is associated with a more rapid progression of disability in RA. Weight loss is also associated with worsening disability, possibly due to it being an indication of chronic illness and the development of age-related or disease-related frailty.

Association Between Comorbidities and Quality of Life in Psoriatic Arthritis: Results from a Multicentric Cross-sectional Study

OBJECTIVE

In psoriatic arthritis (PsA), comorbidities add to the burden of disease, which may lead to poorer quality of life. The purpose of this study was to evaluate the relationship between comorbidities and quality of life (QOL).

METHODS

Patients from a multicentric, cross-sectional study on comorbidities in PsA were included in the analysis. Data on comorbidities were collected and were subsequently used to compute the modified Rheumatic Disease Comorbidity Index (mRDCI). The Medical Outcomes Study Short Form-36 questionnaire physical (PCS) and mental component summary (MCS) scales were used to assess QOL.

RESULTS

In total, 124 recruited patients fulfilled the ClASsification for Psoriatic ARthritis criteria (CASPAR): 62.1% were male; mean age and mean disease duration were 52.6 ± 12.6 years and 11.3 ± 9.6 years, respectively. The number of comorbid conditions was 2.0 ± 1.3, with 30.6% of the sample having currently or a history of 3 or more comorbidities. In the multivariate linear regression analysis, only anxiety remained significantly related to mental health (p < 0.0001). Anxiety alone accounted for 28.7% of the variance in MCS scores. Moreover, MCS was also significantly associated with the mRDCI score, which explained 4.9% of the variance in MCS [β = -1.56 (standard error 0.64), R² = 0.049, p = 0.0167]. In contrast, PCS was not significantly associated either with type or number of comorbidities.

CONCLUSION

In this study, the type of comorbidity appeared to have a greater effect than the number of comorbidities. Indeed, anxiety in PsA was independently associated with QOL and would thus be an important factor to take into account in daily clinical practice.

Serious infection risk in rheumatoid arthritis compared with non-inflammatory rheumatic and musculoskeletal diseases: a US national cohort study

Objectives

To identify serious infection (SI) risk by aetiology and site in patients with rheumatoid arthritis (RA) compared with those with non-inflammatory rheumatic and musculoskeletal diseases (NIRMD).

Methods

Patients participating in FORWARD from 2001 to 2016 were assessed for SIs; defined by infections requiring hospitalisation, intravenous antibiotics or followed by death. SIs were categorised by aetiology and site. SI risk was assessed through Cox proportional hazards models. Best models were selected using machine learning Least Absolute Shrinkage and Selection Operator (LASSO) methodology.

Results

Among 20 361 patients with RA and 6176 patients with NIRMD, 1600 and 276 first SIs were identified, respectively. Incidence of SIs was higher in RA compared with NIRMD (IRR = 1.5; 95% CI 1.2 to 1.5). The risk persisted after adjusting using the LASSO model (HR 1.7; 95% CI 1.5 to 1.8), but attenuated when additionally adjusted for glucocorticoid use (HR 1.3; 95% CI 1.2 to 1.5). SI risk was significantly higher in RA versus NIRMD for bacterial infections as well as for respiratory, skin, bone, joint, bloodstream infections and sepsis irrespective of glucocorticoid use. Compared with NIRMD, SI risk was significantly increased in patients with RA who were in moderate and high disease activity but was similar to those in low disease activity/remission (p trend < 0.001).

Conclusions

The risk of all SIs, particularly bacterial, respiratory, bloodstream, sepsis, skin, bone and joint infections are significantly increased in patients with RA compared with patients with NIRMD. This infection risk appears to be greatest in those with higher RA disease activity.

Comorbidity burden and clinical characteristics of patients with difficult-to-control rheumatoid arthritis

INTRODUCTION

Difficult-to-treat rheumatoid arthritis (RA) is a significant clinical problem despite no clear definition. We aimed to provide clinical characteristics and associated comorbidities of RA patients in relation to disease control.

METHODS

RA characteristics and physician-recorded comorbidities were analyzed in a sample of 1937 RA patients. Patients treated for RA for 5.2 y (IQR, 2.1-11.3) were classified as difficult-to-control when presenting with DAS28-ESR > 3.2 despite previous use of at least 2 csDMARDs. A comparison of demographic and RA-related characteristics between difficult-to-treat and low disease activity patients (DAS28-ESR ≤ 3.2) was performed. Comorbidity burden was assessed by calculating Rheumatic Diseases Comorbidity Index (RDCI). Logistic regression model was constructed for difficult-to-control disease.

RESULTS

Hypertension (46.9% (95%CI, 44.7-49.2)), coronary artery disease (CAD) (18.5% (95%CI, 16.8-20.3)), and diabetes (14.4% (95%CI, 12.9-16.0)) were the most prevalent conditions in RA patients. When compared with the adequate control group, difficult-to-control patients were increasingly burdened with hypertension (52.7% (95%CI, 47.5-57.8) vs. 42.0% (95%CI, 36.6-47.6); p = 0.006), cardiovascular diseases (24.2% (95%CI, 20.1-28.9) vs. 11.1% (95%CI, 8.0-15.1); p < 0.001), respiratory system diseases (7.0% (95%CI, 4.8-10.2) vs. 3.3% (95%CI, 1.8-5.9); p = 0.03) and gastroduodenal ulcers (2.3% (95%CI, 1.2-4.4) vs. 0.3% (95%CI, 0.1-1.8); p = 0.04). Patients with higher RDCI had lower chance to obtain low disease activity (OR 0.69 (95%CI, 0.61-0.79); p < 0.001). In multivariate analysis, RDCI was independently associated with difficult-to-control disease (OR 1.46 (95%CI, 1.21-1.76); p < 0.001).

CONCLUSIONS

RA patients suffer from a variety of comorbidities. Cardiovascular and respiratory system diseases occur twice as often in difficult-to-control patients. RDCI may provide a valuable tool in evaluating a risk for difficult-to-control RA. Key Points • Hypertension, coronary artery disease and diabetes are the most prevalent comorbidities in rheumatoid arthritis. • Cardiovascular and respiratory tract diseases as well as gastroduodenal ulcers are more common among difficult-to-control patients, when compared with subjects with adequately controlled RA. • Rheumatic Diseases Comorbidity Index is an independent predictor for difficult-to-control RA.

Polypharmacy is associated with treatment response and serious adverse events: results from the British Society for Rheumatology Biologics Register for Rheumatoid Arthritis

Objective

To evaluate whether polypharmacy is associated with treatment response and serious adverse events (SAEs) in patients with RA using data from the British Society for Rheumatology Biologics Register (BSRBR-RA).

Methods

The BSRBR-RA is a prospective observational cohort study of biologic therapy starters and a DMARD comparator arm. A logistic regression model was used to calculate the odds of a EULAR ‘good response’ after 12 months of biologic therapy by medication count. Cox proportional hazards models were used to identify risk of SAEs. The utility of the models were compared with the Rheumatic Disease Comorbidity Index using Receiver Operator Characteristic and Harrell’s C statistic.

Results

The analysis included 22 005 patients, of which 83% were initiated on biologics. Each additional medication reduced the odds of a EULAR good response by 8% [odds ratios 0.92 (95% CI 0.91, 0.93) P < 0.001] and 3% in the adjusted model [adjusted odds ratios 0.97 (95% CI 0.95, 0.98) P < 0.001]. The Receiver Operator Characteristic demonstrated significantly greater areas under the curve with the polypharmacy model than the Rheumatic Disease Comorbidity Index. There were 12 547 SAEs reported in 7286 patients. Each additional medication equated to a 13% increased risk of an SAE [hazard ratio 1.13 (95% CI 1.12, 1.13) P < 0.001] and 6% in the adjusted model [adjusted hazard ratio 1.06 (95% CI 1.05, 1.07) P < 0.001]. Predictive values for SAEs were comparable between the polypharmacy and Rheumatic Disease Comorbidity Index model.

Conclusion

Polypharmacy is a simple but valuable predictor of clinical outcomes in patients with RA. This study supports medication count as a valid measure for use in epidemiologic analyses.

Individual-level and country-level socioeconomic determinants of disease outcomes in SpA: multinational, cross-sectional study (ASAS-COMOSPA)

OBJECTIVE

To explore the independent contribution of individual-level and country level socioeconomic status (SES) determinants to disease activity and physical function in patients with spondyloarthritis (SpA).

METHODS

Data from the cross-sectional, multinational (n=22 countries worldwide) COMOSPA (COMOrbidities in SpA) study were used. Contribution of individual SES factors (gender, education) and country of residence to Ankylosing Spondylitis Disease Activity Score (ASDAS) and Bath Ankylosing Spondylitis Functional Index (BASFI) was explored in multilevel regression models, adjusting for clinical and demographic confounders. Next, the additional effects of national macroeconomic indicators (gross domestic product [GDP], Human Development Index, healthcare expenditure and Gini index) were explored. The mediating role of uptake of biologic disease-modifying antirheumatic drugs between education or GDP and ASDAS was explored by testing indirect effects.

RESULTS

In total, 3370 patients with SpA were included: 65% were male, with a mean age of 43 (SD 14), ASDAS of 2.0 (SD 1.1) and BASFI score of 3.1 (SD 2.7). In adjusted models, patients with low education and female patients had an OR of 1.7 (95% CI 1.3 to 2.2) and an OR of 1.7 (95% CI 1.4 to 2.0), respectively, of having ASDAS ≥2.1. They also reported slightly worse function. Large country differences were observed independent of individual SES and clinical confounders. Patients from less SES developed countries have worse ASDAS, while patterns for BASFI were insignificant. Uptake of biologicals did not mediate the relationship between individual-level or country-level SES and disease activity.

CONCLUSIONS

Individual-level and country-level health inequalities exist also among patients with SpA. Women and lower educated persons had worse disease activity and somewhat worse physical function. While patients in less socioeconomically developed countries had higher disease activity, they reported similar physical function.

Identification of Axial Spondyloarthritis Patients in a Large Dataset: The Development and Validation of Novel Methods

OBJECTIVE

Observational axial spondyloarthritis (axSpA) research in large datasets has been limited by a lack of adequate methods for identifying patients with axSpA, because there are no billing codes in the United States for most subtypes of axSpA. The objective of this study was to develop methods to accurately identify patients with axSpA in a large dataset.

METHODS

The study population included 600 chart-reviewed veterans, with and without axSpA, in the Veterans Health Administration between January 1, 2005, and June 30, 2015. AxSpA identification algorithms were developed with variables anticipated by clinical experts to be predictive of an axSpA diagnosis [demographics, billing codes, healthcare use, medications, laboratory results, and natural language processing (NLP) for key SpA features]. Random Forest and 5-fold cross validation were used for algorithm development and testing in the training subset (n = 451). The algorithms were additionally tested in an independent testing subset (n = 149).

RESULTS

Three algorithms were developed: Full algorithm, High Feasibility algorithm, and Spond NLP algorithm. In the testing subset, the areas under the curve with the receiver-operating characteristic analysis were 0.96, 0.94, and 0.86, for the Full algorithm, High Feasibility algorithm, and Spond NLP algorithm, respectively. Algorithm sensitivities ranged from 85.0% to 95.0%, specificities from 78.0% to 93.6%, and accuracies from 82.6% to 91.3%.

CONCLUSION

Novel axSpA identification algorithms performed well in classifying patients with axSpA. These algorithms offer a range of performance and feasibility attributes that may be appropriate for a broad array of axSpA studies. Additional research is required to validate the algorithms in other cohorts.