The prevalence of comorbid and concomitant diseases in psoriatic arthritis patients, data from Russian register
Authors: Korsakova Yu. L. , Korotaeva T. V. , Loginova E. Yu. , Gubar E. E. , Vasilenko E. A. , Vasilenko A. A. , Kuznetsova N. A. , Patrikeeva I. M. , Nasonov E. L. 
Published: July 2021

Psoriatic arthritis (PsA) is a heterogeneous inflammatory arthritis associated with psoriasis (Ps); it belongs to the group of spondyloarthritis and is accompanied by damage to both the spine and peripheral joints, as well as the development of enteritis and dactylitis. In addition to skin and joint damage, PsA has numerous comorbid conditions that are pathogenetically related to the underlying disease, such as inflammatory bowel disease (IBD) and autoimmune eye disease, as well as cardiovascular diseases, obesity and metabolic syndrome, diabetes, osteoporosis, malignancies, mental disorders, and various concomitant diseases. We present data of the prevalence of these pathological conditions among the cohort of PsA patients included in the Russian register.Objective– to study the prevalence of comorbid and concomitant diseases in PsA patients.Materials and methods. The Russian multicenter, observational study with retrospective and prospective data collection of PsA patients included 614 patients with the established diagnosis psoriatic arthritis, corresponding to the CASPAR criteria, from 39 subjects of the Russian Federation, female/male – 331 (54%)/283 (46%). The average age was 45.2±0.52 years, duration of PsA – 5.7±0.27 years, Ps – 15.71±0.56. Duration of observation period: January 2016 – November 26, 2019. The diagnosis of comorbid and concomitant diseases was confirmed by medical specialists in accordance with the ICD-10 code. The analysis of the frequency and structure (%) of these diseases was carried out.Results. The majority of PsA patients had limited Ps: the area of Ps skin lesion (BSA, Basic Surface Area) was less than 3% in 372 (61.5%) patients, BSA from 3% to 10% – in 185 (30.6%), BSA>10% – in 47 (7.8%). Comorbid and concomitant diseases were detected in 297 (48%) of 614 patients. 183 (61.6%) patients had 2 or more diseases in addition to Ps and PsA. Diseases of the circulatory system were detected in 229 (77.1%) PsA patients with comorbid and concomitant diseases (arterial hypertension – in 194 (65.3%), coronary heart disease – in 22 (7.4%)). Diseases of the endocrine system, metabolic disorders were detected in 156 (52.5%) patients with PsA (diabetes mellitus in 44 (14.8%), hyperlipidemia in 44 (14.8%), metabolic syndrome in 36 (12.1%), obesity in 7 (2.4%), and others). Gastrointestinal diseases were observed in 62 (20.9%) patients. Diseases of the biliary system – in 33 (11.1%) patients. Diseases of the musculoskeletal system and connective tissue that are not associated with PsA – in 44 (14.8%). Diseases of the genitourinary system – in 23 (7.7%) patients. Respiratory diseases – in 17 (5.7%) patients. Infectious diseases – in 11 (3.7%). Eye diseases were detected – in 10 (3.4%) patients. Hematological diseases were diagnosed in 6 (2.0%) patients. Depression – in 4 (1.3%) patients.Conclusions. Among 297 patients with PsA with comorbid and concomitant diseases, diseases of the circulatory system are the most common (in 77.1%), less often – diseases of the endocrine system, metabolic disorders (in 52.5%) and diseases of the digestive system (in 32%). Uveitis (2.7%), IBD (1.3%), and depression (1.3%) were rarely detected in our cohort. The majority of patients in the Russian registry had mild forms of Ps (61.5%), and severe Ps (BSA>10%) was observed only in 7.8%. Thus, PsA is associated with a high prevalence of comorbid and concomitant diseases, especially cardiovascular. When choosing a treatment, these diseases should be taken into account. In connection with the new possibilities of therapy, it is necessary to evaluate the potential impact of therapy on patients with comorbid and concomitant diseases in real clinical practice.