Understanding the association between skin involvement and joint activity in patients with psoriatic arthritis: experience from the Corrona Registry

Predictive factors of psoriatic arthritis in a diverse population with psoriasis

OBJECTIVE

We aimed to analyze the clinical characteristics of patients with psoriasis and determine the predictive factors of psoriatic arthritis (PsA).

METHODS

This retrospective cohort study was performed among patients with psoriasis. Demographic and clinical data were collected. Psoriasis treatment was categorized as topical agents, phototherapy, oral therapy, and biologics. Predictive factors of PsA development were determined using logistic regression analyses.

RESULTS

We included 330 patients with psoriasis, and 83 (25%) patients developed PsA. Thirty-eight (45.8%) patients who developed PsA were Malay, 24 (28.9%) were Chinese, and 21 (25.3%) were Indian. The mean age of patients with PsA was 54.2 (±15.8) years, and the duration from diagnosis of psoriasis to diagnosis of PsA was 36 (3.5-114) months. Predictive factors for developing PsA were female sex (odds ratio [OR] = 3.33, 95% confidence interval [CI] 1.78-6.22), presence of nail involvement (OR = 5.36, 95% CI 2.50-11.51), severe psoriasis (OR = 27.41, 95% CI 7.58-99.11), and oral systemic therapy prior to PsA diagnosis (OR = 4.09, 95% CI 2.04-8.22).

CONCLUSION

Patients with psoriasis who are female, have nail involvement, severe skin psoriasis, and require oral systemic therapy for psoriasis may have an increased risk of developing PsA.

Pediatric Psoriasis with or without Arthritis: Does It Make a Difference?

BACKGROUND

Psoriasis and psoriatic arthritis can present simultaneously or separately in children and may pose a diagnostic challenge.

OBJECTIVE

To compare the dermatological manifestations in pediatric psoriatic patients with and without arthritis.

METHODS

A retrospective case-control study of psoriatic patients ≤ 18 years old at Sheba Medical Center was conducted between 2011 and 2021. Patients with psoriatic arthritis versus psoriasis-only were compared according to body surface area (BSA) involvement, cutaneous distribution, severity of skin disease, response to treatment and related side effects.

RESULTS

The study cohort included 29 psoriatic arthritis and 64 psoriasis-only patients matched by age and sex. The psoriasis-only group had a significantly higher mean BSA (19.7%, SD ± 18.7) than the psoriatic arthritis group (6.1%, SD ± 11.4), (p = 0.029). The skin distribution differed with the psoriasis group showing more involvement of the extremities, scalp, trunk, and genitals. Both groups primarily experienced partial responses to methotrexate, whereas the psoriasis group mainly saw complete responses to biologics. Adverse events were rare, with a higher incidence in the psoriasis group.

CONCLUSION

This retrospective study highlights the differences in cutaneous disease characteristics, severity, and treatment response in pediatric patients with psoriasis and psoriatic arthritis, providing valuable insights for diagnosis and disease course in the pediatric population.

Characterization of patients with psoriatic arthritis in dermatologic and rheumatologic care: analysis of two registries

BACKGROUND AND OBJECTIVE

Psoriatic arthritis (PsA) is a chronic systemic inflammatory disease affecting the musculoskeletal system, skin and nails. The aim is to characterize sociodemographic and clinical patient profiles documented in dermatologic and rheumatologic care.

PATIENTS AND METHODS

Data of 704 patients with PsA from the dermatological Psoriasis Registry PsoBest (PB) and 1066 patients from the rheumatological disease registry RABBIT-SpA (RS) were analyzed. Comparable anamnestic and clinical variables were identified and descriptively analyzed.

RESULTS

The mean age was 51.7 years in PB and 51.9 in RS. Disease duration of psoriasis was longer, mean cutaneous severity was higher in PB. However, more patients in RS vs. PB had tender joints and swollen joints. Mean Dermatology Life Quality Index was higher in PB and mean Health Assessment Questionnaire in RS. Patient reported global disease activity and pain were lower in PB. IL-23 inhibitors were used more frequently in PB, and TNF inhibitors in RS.

CONCLUSIONS

Clinical specialization was associated with different clinical and treatment patterns of PsA. This may indicate a selection by dominant manifestation of psoriatic disease and potentially by effects of health care access. Psoriatic arthritis should be treated in a multidisciplinary approach considering all facets of this complex disease.

Charakterisierung von Patienten mit Psoriasisarthritis in der dermatologischen und rheumatologischen Versorgung: Analyse von zwei Registern: Characterization of patients with psoriatic arthritis in dermatologic and rheumatologic care: analysis of two registries

Hintergrund und Zielsetzung

Die Psoriasisarthritis (PsA) ist eine chronische systemische Entzündungskrankheit, die den Bewegungsapparat, die Haut und die Nägel betrifft. Ziel ist es, soziodemografische und klinische Patientenprofile zu charakterisieren, die in der dermatologischen und rheumatologischen Versorgung dokumentiert werden.

Patienten und Methodik

Es wurden die Daten von 704 PsA‐Patienten aus dem dermatologischen Psoriasis‐Register PsoBest (PB) und 1066 Patienten aus dem rheumatologischen Krankheitsregister RABBIT‐SpA (RS) analysiert. Vergleichbare anamnestische und klinische Variablen wurden identifiziert und deskriptiv ausgewertet.

Ergebnisse

Das Durchschnittsalter betrug 51,7 Jahre bei PB und 51,9 Jahre bei RS. Die Krankheitsdauer der Psoriasis war länger und der mittlere Schweregrad der Hauterkrankung war bei den Patienten in PB höher, jedoch hatten mehr Patienten in RS schmerzende und geschwollene Gelenke. Der mittlere Dermatology Life Quality Index war bei den Patienten in PB höher und der mittlere Health Assessment Questionnaire bei den Patienten in RS. Die von den Patienten angegebene globale Krankheitsaktivität und die Schmerzen waren in PB geringer. IL‐23‐Inhibitoren wurden in PB häufiger eingesetzt, TNF‐Inhibitoren bei RS.

Schlussfolgerungen

Die klinische Spezialisierung wurde mit unterschiedlichen Krankheitsbildern und Behandlungsmustern der PsA in Verbindung gebracht. Dies könnte auf eine Selektion nach der vorherrschenden Manifestation der Psoriasis‐Erkrankung und möglicherweise auf Auswirkungen des Zugangs zur Gesundheitsversorgung hinweisen. Die PsA sollte in einem multidisziplinären Ansatz behandelt werden, der alle Facetten dieser komplexen Erkrankung berücksichtigt.

Chinese Registry of Psoriatic Arthritis (CREPAR): I. Clinical characteristics of Chinese patients with psoriatic arthritis

AIM

To describe the clinical characteristics of Chinese patients with psoriatic arthritis (PsA) using the data recorded in the Chinese Registry of Psoriatic Arthritis (CREPAR).

METHODS

This is a cross-sectional study based on the CREPAR registry, which is a prospective registry founded in December 2018. Data regarding clinical characteristics and treatment of patients were collected during every visit. Data recorded at enrollment were extracted, analyzed, and compared with data in other registries or cohorts.

RESULTS

A total of 1074 patients were registered from December 2018 to June 2021. Of these, 929 (86.5%) patients had a history of peripheral arthritis, and 844 patients (78.6%) had peripheral arthritis at enrollment, of which polyarthritis is the most common subtype. Axial involvement was present in 39.9% of patients, and 50 (4.7%) patients had axial involvement only. More than half of the patients (55.4%) had at least two musculoskeletal presentations at enrollment. The prevalence of low disease activity and remission according to DAPSA were 26.4% and 6.8%, respectively. Conventional synthetic disease-modifying antirheumatic drugs (csDMARDs) and biological DMARDs were used in 64.9% and 29.1% of patients, respectively. Among patients with different musculoskeletal presentations, patients with dactylitis had the highest proportion of nonsteroidal anti-inflammatory and csDMARD use. The proportion of patients receiving bDMARDs was highest in axial PsA.

CONCLUSION

The CREPAR registry has provided information on Chinese patients with PsA. Compared with data in other registries or cohorts, the disease activity of patients in CREPAR was higher, and the proportion of bDMARD use was lower.

[A new integral enthesial-comorbididity index of psoriatic arthritis activity]

AIM

To develop an integral index of psoriatic arthritis (PsA) activity.

MATERIALS AND METHODS

117 patients with PsA (M/F - 63/54) were included. Patients' age 44±11 years, psoriasis (Ps) duration - 213±153 months, PsA duration - 73.4±78.5 months. Patients underwent standard clinical examination of PsA activity: tender (out of 68) and swollen (out of 66) joint counts (TJC, SJC), LEI, tenderness of the plantar fascia (PF), skin lesion severity (BSA), presence of nail Ps, body mass index (BMI), erythrocyte sedimentation rate (ESR), C-reactive protein (CRP), DAPSA, FACIT-F. Parametric and nonparametric statistic methods, correlation and ROC analysis were used.

RESULTS

Mean DAPSA was 38±21, TJC - 14.2±10.6, SJC - 10.6±8.3, ESR - 30.5±29.5 mm/h, CRP - 23.3±29 mg/l, LEI - 1.2±1.5, FACIT-F - 32±11, BMI - 27.4±6.2 kg/m2. The following significant positive correlations were revealed: between DAPSA and BMI, patients' age, ESR, PsA and Ps duration, TJC, SJC, LEI, presence of PF enthesitis, skin lesion severity, presence of nail Ps. A negative correlation between FACIT-F and male sex was found. Based on the predictive model of parameters, the Entesial-Comorbid Index of PsA (ECIPsA) was created: 3.81×LEI+13.72×PF+0.54×Age-0.25×FACIT-F+7.36×BSA+7.94×PsA duration+5.5×Nail Ps+0.32×BMI-3.52, namely LEI - Leeds Enthesial Index; PF - pain in the PF; patient's age; FACIT-F - fatigue scale; BSA<3%=0, ≥3%=1; PsA duration≤2 years=0, >2 years=1; presence of nail Ps=1, absence=0; ECIPsA≥28 corresponds with high PsA activity according to DAPSA≥28. ROC analysis of sensitivity and specificity of the prognostic model demonstrated high correctness of the index: the area under the ROC curve was 0.768, 95% confidence interval (0.624-0.913).

CONCLUSION

The new PsA activity index corresponds to the existing ones and takes into consideration the clinical heterogeneity and comorbidity of the disease.

Exploring the Association Between History of Psoriasis (PSO) and Disease Activity in Patients with Psoriatic Arthritis (PsA)

Introduction

Psoriatic arthritis (PsA) is a common inflammatory disease affecting the peripheral and axial skeleton. History of psoriasis (PSO), either personal or family history, is an important factor in the diagnosis of PsA. We investigated the association between history of PSO and clinical characteristics of PsA.

Methods

PsA patients were consecutive recruited from 2019 to 2020. These patients were subjected to clinical, biochemical, and radiographic examinations, and disease activity was evaluated. Continuous and categorical variables analyses were presented.

Results

All registered patients (296 cases) met the classification criteria of PsA. They were divided into three groups based on the history of psoriasis (PSO), as: (1) 145 patients with PSO themselves (pPsA); (2) 96 patients with family history of PSO (fPsA); (3) 55 patients with family history and coexisting PSO themselves (fPsA/PSO). Compared to fPsA/PSO, the levels of CRP, ESR, uric acid, DAPSA, BASDAI, ASDAS, and BASFI were lower in fPsA, but similar to pPsA. The severity of sacroiliitis tended to be more severe in fPsA/PSO than fPsA (OR_{2 vs. 3} 0.508; 95% CI 0.272 to 0.949, p < 0.05). No significant differences were found in HLA-B-27 and common inflammatory articular and extra-articular manifestations among the three groups. Furthermore, there were no differences in LEI, TJC, SJC, and DAS28_CRP. Interestingly, a correlation was found between the ages of individuals with PSO and the onset of arthritis, and the earliest arthritis onset occurred in fPsA/PSO patients (p < 0.001).

Conclusions

Our study demonstrates that currently existing cutaneous lesions in patients themselves are correlated with disease activity and severity of axial joint damage, whereas family history does not have an evident impact on the disease activity of PsA.

Disparities in healthcare in psoriatic arthritis: an analysis of 439 patients from 13 countries

OBJECTIVES

Patient care can vary substantially by country. The objective was to explore differences in psoriatic arthritis (PsA) across countries for disease activity, impact and treatments.

METHODS

A cross-sectional analysis of 13 countries from the Remission/Flare in PsA study (NCT03119805) of consecutive adult patients with definite PsA was performed. Countries were classified into tertiles by gross domestic product (GDP)/capita. Disease activity (Disease Activity in PsA, DAPSA and Minimal Disease Activity, MDA) and their components, disease impact (patient-reported outcomes) and biological disease-modifying antirheumatic drugs (bDMARDs) were analysed per country and compared between the three tertiles of GDP/capita by parametric and non-parametric tests. We also explored the percentage of patients with significant disease activity (DAPSA >14) and no ongoing bDMARD prescription.

RESULTS

In 439 patients (50.6% male, mean age 52.3 years, mean disease duration 10.1 years), disease activity and disease impact were higher in the lowest GDP/capita countries. DAPSA remission and MDA were attained in the lowest tertile in 7.0% and 18.4% patients, vs 29.1% and 49.5% in the middle tertile and 16.8% and 41.3% in the high tertile, respectively (all p<0.001). bDMARDs use was similar in the tertiles (overall mean 61%). The overall rate of patients with DAPSA >14 and no bDMARDs was 18.5%, and was higher in lower GDP/capita countries (p=0.004).

CONCLUSION

PsA patients from countries with the lowest GDP/capita, despite similar use of bDMARDs, were more likely to have high disease activity and worse disease impact. There is a need for more equity in healthcare.

Residual Disease Associated with Suboptimal Treatment Response in Patients with Psoriatic Arthritis: A Systematic Review of Real-World Evidence

Objective

This systematic literature review aimed to identify and summarise real-world observational studies reporting the type, prevalence and/or severity of residual symptoms and disease in adults with psoriatic arthritis (PsA) who have received treatment and been assessed against remission or low disease activity targets.

Methods

Patients had received treatment and been assessed with treat-to-target metrics, including minimal disease activity (MDA), Disease Activity Index in PsA (DAPSA) and others. MEDLINE, Embase® and the Cochrane Database of Systematic Reviews (CDSR) were searched using search terms for PsA, treatment targets and observational studies. Screening of search results was completed by two independent reviewers; studies were included if they reported relevant residual disease outcomes in adults with PsA who had received one or more pharmacological treatments for PsA in a real-world setting. Non-observational studies were excluded. Information from included studies was extracted into a prespecified grid by a single reviewer and checked by a second reviewer.

Results

Database searching yielded 2328 articles, of which 42 publications (27 unique studies) were included in this systematic literature review. Twenty-three studies reported outcomes for MDA-assessed patients, and 14 studies reported outcomes for DAPSA-assessed patients. Physician- and patient-reported residual disease was less frequent and/or severe in patients reaching targets, but often not absent, including when patients achieved very low disease activity (VLDA) or remission. For example, studies reported that 0–8% patients in remission according to DAPSA (or clinical DAPSA) had > 1 tender joint, 25–39% had Psoriasis Area and Severity Index (PASI) score > 1 and 0–10% had patient-reported pain > 15. Residual disease was usually less frequent and/or severe among patients achieving MDA-assessed targets versus DAPSA-­assessed targets, especially for skin outcomes.

Conclusion

The findings demonstrate a need for further optimisation of care for patients with PsA.

Prevalence and consequences of psoriasis in recent axial spondyloarthritis: an analysis of the DESIR cohort over 6 years

OBJECTIVES

The consequences of psoriasis associated to axial spondyloarthritis (axSpA) are unclear. The objectives were to determine the prevalence and the consequences of psoriasis in recent axSpA over 6 years of follow-up.

METHODS

The multicentric prospective cohort DESIR (NCT01648907) of adult patients with recent inflammatory back pain suggestive of axSpA was analysed over 6 years. Psoriasis was recorded at each visit and cumulative prevalence and incidence were calculated. Patients with vs without psoriasis at any time point were compared. Outcomes included disease activity (Ankylosing Spondylitis Disease Activity Score-C reactive protein (ASDAS-CRP), joint and enthesitis count, CRP), patient-reported outcomes for function (Health Assessment Questionnaire for axSpA, HAQ-AS) and quality of life, and treatment use over 6 years. Outcomes were compared through univariable and multivariable analyses, as well as linear mixed effect models.

RESULTS

In 589 patients, mean age 40.5±8.7 years, 45.8% men and baseline mean symptom duration 1.5±0.9 years, the cumulative prevalence of psoriasis increased from 16.8% (99/589) at baseline to 26.8% (158/589) at 6 years, leading to an incidence of 2.1/100 patient-years. Over 6 years of follow-up, patients with psoriasis developed more synovitis (p=0.008), and received more methotrexate (cumulative use, 25.5% vs 11.8%, p<0.001) and biological disease-modifying drugs (55.7% vs 38.5%, p<0.001). There were no significant consequences of psoriasis on other outcomes, including disease activity (ASDAS-CRP), functional capacity (HAQ-AS) and quality of life.

CONCLUSION

Psoriasis is frequent in early axSpA. AxSpA patients with psoriasis had more swollen joints over time and received more biologics; they did not have worse outcomes related to axSpA in terms of activity and severity.

TRIAL REGISTRATION NUMBER

NCT01648907.

Telemedicine and psoriatic arthritis: best practices and considerations for dermatologists and rheumatologists

Telemedicine encompasses a variety of modalities that allow for the remote assessment and treatment of patients. The technologies, services, and tools available for telemedicine in the USA are increasingly becoming an integral part of the healthcare system to bridge the gaps in care that can arise from geographic and/or socioeconomic obstacles and provider shortages. Telemedicine can be applied to a spectrum of clinical areas, including rheumatic diseases. Psoriatic arthritis (PsA) is a chronic, inflammatory, multisystem disease with predominately skin and joint manifestations. PsA is often misdiagnosed and/or undiagnosed, which can lead to worse patient outcomes, including irreversible joint erosion and damage. The difficulties in diagnosing and managing PsA are confounded by the emergence and increased use of telemedicine because of the COVID-19 pandemic. Telemedicine presents the opportunity to increase access to healthcare by rheumatologists and dermatologists to improve training and education regarding PsA and to decrease time attributed to office visits associated with PsA. However, challenges in diagnosing PsA without a thorough in-person physical examination by a trained rheumatologist or dermatologist exist. We provide an overview of the ways telemedicine can be incorporated into clinical care and optimized for patients with PsA; characteristic clinical features of PsA, with a focus on skin and joint signs and symptoms; screening tools to be used in routine clinical care; assessments that can be used to evaluate quality of life, functional ability, and disease activity in PsA; and resources and recommendations for the development of future telemedicine use in rheumatology and dermatology.

Key Points • Patients with psoriatic arthritis (PsA) are often misdiagnosed and/or undiagnosed. • Telemedicine can improve access to healthcare by rheumatologists and dermatologists. • Telemedicine can be incorporated into clinical care and optimized for managing PsA.

Impact of psoriatic disease on women aged 18 to 45: Results from a multinational survey across 11 European countries

Background

Plaque psoriasis (PSO) is a long-term inflammatory condition that can cause concomitant joint symptoms (psoriatic arthritis [PsA]) in up to 30% of patients. The impact of psoriatic disease on disease outcomes and quality of life is greater in women than men.

Objective

We evaluated the impact of psoriatic disease on women aged 18 to 45 years across Europe.

Methods

Women aged 18 to 45 years with moderate to severe PSO, PsA, or PSO + PsA (PSO with progression to PsA) and prior biologic experience were recruited from market research panels and patient association groups of the International Federation of Psoriasis Associations, European Federation of Psoriasis Patient Associations, and Arthritis Ireland and asked to complete a survey. Questions covered social and psychological wellbeing, employment, and family planning. Question types included 5- or 7-point agreement scales, where the highest/lowest two ratings were considered agreement/disagreement, respectively. The results are reported as proportions of those who selected the answer, divided by overall respondents for each question. Women were not required to answer all questions.

Results

Survey respondents (N = 573) had a diagnosis of PSO (n = 236), PsA (n = 173), or PSO + PsA (n = 164). Women self-reported similar mean scores for physical (57.0 of 100) and mental (59.0 of 100) health. A fifth (21%) had not achieved their desired career due to PSO/PsA; career dissatisfaction and increased sick leave were linked to poor mental health. Some women reported having a limited social life (33%), smaller families (34%), and being more likely to adopt children (27%) due to PSO/PsA. A quarter of women (27%) reported not understanding enough about PSO/PsA (nonmembers vs. members of patient association groups: 37% vs. 8%).

Conclusion

Our findings highlight the considerable burden of psoriatic disease on women of childbearing age. Increased provision of information tailored to women, training for health care professionals, and shared decision-making between patients and health care professionals may help better support women with psoriatic disease.

Is pain associated with premature mortality in patients with psoriatic arthritis? A nested case-control study using the DANBIO Register

OBJECTIVES

It has been hypothesized that the presence of chronic pain causes excess mortality. Since chronic pain is prevalent among patients with PsA this potential association should be explored. We aimed to investigate whether higher cumulative pain intensity is associated with an excess mortality risk in patients with PsA.

METHODS

A nested case-control study using data from the nationwide DANBIO Register (Danish Database for Biological Therapies in Rheumatology) Register and Danish healthcare registers. Cases were patients who died and corresponding to the date of death, matched on sex, year of birth and calendar period at the time of death with up to five controls. Exposure of interest was mean pain intensity reported during the time followed in routine rheumatology practice. Pain intensity was measured using a visual analogue scale from 0 to 100 and conditional logistic regression was used to calculate odds of mortality per 5 unit increase in pain while adjusting for confounders.

RESULTS

The cohort consisted of 8019 patients. A total of 276 cases were identified and matched with 1187 controls. Higher mean pain intensity was associated with increased odds of mortality [odds ratio 1.06 (95% CI 1.02, 1.10)] in the crude model, but there was no association [odds ratio 0.99 (95% CI 0.95, 1.03)] when adjusting for additional confounders. Factors shown to increase the odds of mortality were recent glucocorticoid use, concomitant chronic obstructive pulmonary disease, diabetes mellitus, cancer and cardiovascular disease.

CONCLUSION

These results indicate that experienced pain in itself is not associated with premature mortality in patients with PsA. However, recent glucocorticoid use and concurrent comorbidities were.

The Molecular Pathophysiology of Psoriatic Arthritis-The Complex Interplay Between Genetic Predisposition, Epigenetics Factors, and the Microbiome

Psoriasis is a symmetric autoimmune/inflammatory disease that primarily affects the skin. In a significant proportion of cases, it is accompanied by arthritis that can affect any joint, the spine, and/or include enthesitis. Psoriasis and psoriatic arthritis are multifactor disorders characterized by aberrant immune responses in genetically susceptible individuals in the presence of additional (environmental) factors, including changes in microbiota and/or epigenetic marks. Epigenetic changes can be heritable or acquired (e.g., through changes in diet/microbiota or as a response to therapeutics) and, together with genetic factors, contribute to disease expression. In psoriasis, epigenetic alterations are mainly related to cell proliferation, cytokine signaling and microbial tolerance. Understanding the complex interplay between heritable and acquired pathomechanistic factors contributing to the development and maintenance of psoriasis is crucial for the identification and validation of diagnostic and predictive biomarkers, and the introduction of individualized effective and tolerable new treatments. This review summarizes the current understanding of immune activation, genetic, and environmental factors that contribute to the pathogenesis of psoriatic arthritis. Particular focus is on the interactions between these factors to propose a multifactorial disease model.

Comorbidities in a Cohort of 66 Patients With Psoriatic Arthritis Mutilans-Results From the Nordic PAM Study

Objective: Psoriatic arthritis mutilans (PAM) is the most severe phenotype of psoriatic arthritis due to excessive bone erosion causing joint destruction and decreased functional capacity. The aim of this study was to investigate the prevalence of comorbidities among patients with PAM and the association between comorbidities and joint involvement. Methods: A total of 66 patients aged ≥18 years from the Nordic countries with past or present psoriasis along with at least one mutilated joint were included in the present study. Results: The median number of comorbid conditions per patient was 1 [interquartile range (IQR) 0-2] and 16.7% reported three or more comorbidities. The most frequent comorbidity was hypertension (36.4%). The median number of mutilated joints per patient was 3 (IQR 1-8.3; range 1-38). Conclusion: Two thirds of the patients with PAM reported comorbid conditions and the most frequent was hypertension which affected more than a third of the patients. However, this study was unable to detect any association between comorbidities and the severity of PAM.

Use of multidimensional composite scores in rheumatology: parsimony versus subtlety

Rheumatic and musculoskeletal diseases (RMDs) form a diverse group of diseases. Proper disease assessment is pivotal, for instance to make treatment choices and for optimising outcome in general. RMDs are multidimensional diseases, entrenching many, sometimes very different aspects. Composite outcome measures ('composites') have become very popular to assess RMDs, because of their claim to catch all relevant dimensions of the disease into one convenient measure.In this article we discuss dimensionality of RMDs in the context of the most popular conceptual framework of RMDs, being an inflammatory process leading to some sort of damage over time. We will argue that multidimensionality not only refers to heterogeneity in disease manifestations, but also to heterogeneity in possible outcomes. Unlike most unidimensional measures, multidimensional composites may include several disease manifestations as well as several outcome dimensions into one index. We will discuss fundamental problems of multidimensional composites in light of modern strategies such as treat-to-target and personalised medicine.Finally, we will disentangle the use of multidimensional composites in clinical trials versus their use in clinical practice, and propose simple solutions in order to overcome problems of multidimensionality and to avoid harm to our patients due to overtreatment.

Disease Characteristics and the Burden of Joint and Skin Involvement Amongst People With Psoriatic Arthritis: A Population Survey

INTRODUCTION

Psoriatic arthritis (PsA) is a chronic, systemic, inflammatory disease where disease burden and quality of life (QoL) are affected by both joint and skin manifestations.

METHODS

Patient and physician reported data were collected about 3200 patients in a cross-sectional survey of patients from nine countries. Patient-reported outcomes (PROs) included perceptions of symptom importance, EuroQol questionnaire (EQ-5D), Psoriatic Arthritis Impact of Disease (PsAID12), and Work Productivity and Activity Impairment (WPAI) Index. Outcomes were compared in patients with 'joint-only' and 'joint and skin' disease symptoms.

RESULTS

Of the 3200 patients, 2703 had complete information for 'joint-only' or 'joint and skin' involvement and were included in the analysis. Patients had a mean age of 49.2 years, 45.2% were female, and 64.5% had 'joint and skin' involvement. Patients with 'joint and skin' involvement had higher mean tender and swollen joint counts (5.2 and 4.8) than patients who were 'joint-only' (2.0 and 1.5). Significantly more patients with active 'joint and skin' symptoms experienced a flare (currently or within the last 12 months) compared with 'joint-only' patients (34.9 vs. 23.2%, p < 0.001). When asked to prioritize the burden of symptoms, 61.6% of patients prioritized joints, 38.4% prioritized skin. Anxiety/depression was experienced by 41.4% of patients, 62.4% of whom indicated that both joint and skin symptoms were the cause. Patients with 'joint and skin' involvement reported significantly worse QoL, work productivity and activity impairment than 'joint-only' patients (EQ-5D index 0.79 vs. 0.85, p < 0.001; EQ-5D VAS 71.98 vs. 77.68, p < 0.001; PsAID12 2.91 vs. 1.66, p < 0.001; WPAI overall work impairment 25.61 vs. 16.32, p < 0.001).

CONCLUSIONS

PsA patients who experience 'joint and skin' symptoms had significantly worse clinical outcomes, health-related QoL, and work productivity compared with patients with 'joint-only' symptoms.

Axial and peripheral spondyloarthritis: does psoriasis influence the clinical expression and disease burden? Data from REGISPONSER registry

Objective

To evaluate whether the presence of psoriasis influences the clinical expression, disease activity and disease burden in both axial and peripheral phenotypes of spondyloarthritis (SpA).

Methods

Patients from the Spanish REGISPONSER registry classified as having SpA according to the ESSG criteria were included. Patients were classified as psoriatic or non-psoriatic depending on the presence of cutaneous or nail psoriasis; thereafter, they were classified as having either axial [presence of radiographic sacroiliitis OR inflammatory back pain (IBP)] or peripheral phenotype (absence of radiographic sacroiliitis AND absence of IBP AND presence of peripheral involvement). Pair-wise univariate and multivariate analyses among the four groups (psoriatic/non-psoriatic axial phenotypes and psoriatic/non-psoriatic peripheral phenotypes) were performed with adjustment for treatment intake.

Results

A total of 2296 patients were included in the analysis. Among patients with axial phenotype, psoriasis was independently associated (P &lt; 0.05) with HLA-B27+ [odds ratio (OR) 0.27], uveitis (OR 0.46), synovitis (ever) (OR 2.59), dactylitis (OR 2.78) and the use of conventional synthetic DMARDs (csDMARDs) (OR 1.47) in comparison with non-psoriatic patients. Among patients with peripheral phenotype and adjusting for csDMARD intake, psoriasis was independently associated with higher age at disease onset (OR 1.05), HLA-B27+ (OR 0.14) and heel enthesitis (OR 0.22). Higher scores for patient-reported outcomes and greater use of treatment at the time of the study visit were observed in psoriatic patients with either axial or peripheral phenotype.

Conclusion

These findings suggest that, among all patients with SpA, psoriasis is associated with differences in clinical expression of SpA, a greater disease burden and increased use of drugs.