ABSTRACT
BackgroundFor patients with autoimmune rheumatic diseases, the Covid-19 pandemic carried some implications in addition to those faced by the general population. In particular, the question whether these patients are at increased risk of contracting Covid-19 or have an unfavourable disease course has been and is a matter of concern.In autumn 2020, the population of the Vinschgau valley in South Tyrol, northern Italy was still largely spared from infection with SARS-CoV-2. Accordingly, incidence of the disease in the upcoming winter was anticipated to be high.ObjectivesThis prospective observational study aimed at characterizing Covid-19 infections in a population of patients with inflammatory arthritis (IA) residing in the Vinschgau valley. The study was conceived as companion project to an analogously designed prospective cohort study in the general population of the Vinschgau valley, the CHRIS Covid-19 study.MethodsBetween september and december 2020, IA patients (i.e. previously diagnosed rheumatoid arthritis [RA], psoriatic arthritis [PsA] or peripheral spondyloarthritis [SpA]) residing in the Vinschgau valley (n=394 based on national healthcare system database) were contacted. Those who consented to participate in the study underwent a clinical baseline visit including TJC, SJC, VAS and assessment of RAID, PsAID9 or BASDAI (range 0-10, respectively). In addition, a Covid-19 screening questionnaire was administered. Then, active and/or past infection with SARS-CoV-2 were determined by nasopharyneal swab (PCR) and serum antibody test. In positively tested subjects, Covid-19 disease severity was graded according to WHO criteria (range 0-8, with 0 = no evidence of infection and 8 = death). Patients were followed-up with regular telephone interviews including Covid-19 screening questionnaire and RAID/PsAID/BASDAI for up to 12 months.Results111 patients (72 RA, 29 PsA, 10 SpA) were enrolled (see Table 1 for demographics and comorbidities).A total number of 19 PCR-confirmed SARS-CoV-2 infections in 17 patients (10 RA, 7 PsA) were observed. Mean ± standard deviation 7-day incidence (incident cases/study population) was 0.003 ± 0.007.Fatigue, fever, anosmia and sore throat (present in 57.9%, 47.4%, 42.1% and 36.8% of infections, respectively) were the most frequent symptoms. Median (min-max) disease severity was 2 [1-4]. Two infections led to hospitalization, in one case oxygen supply was necessary. Four infections were asymptomatic (Figure 1).One patient died during follow-up due to pre-existing non-small cell lung cancer.Median absolute difference between post- and pre-infection disease activity was 0.4 and -0.8 for RAID and PsAID, respectively (both markedly below the minimal clinically important difference of 3 and 3.6 points, respectively).ConclusionIncidence of Covid-19 in the analysed cohort of patients with IA was low. Symptoms and comorbidities of SARS-CoV-2-positive IA patients reflected those known from the general population. Covid-19 seemed to have no relevant impact on IA disease activity. Comparison of these preliminary data with those of the general population is planned.Figure 1.Spectrum of clinical symptoms reported by study patients during infection with SARS-CoV-2[Figure omitted. See PDF]Table 1.Demographic data and selected comorbidities of study patients. Age and body mass index (BMI) are given in means ± standard deviation, female sex and comorbidities are given in n (% of column totals).TotalSARS-CoV-2 positiveHospitalized111172Age at inclusion (years)59.7 ± 9.462.5 ± 10.076.3 ± 9.0BMI at inclusion (kg/m2)27.9 ± 17.126.1 ± 3.330.5 ± 1.6Female sex76 (68.5)10 (58.8)1 (50)Active smokers22 (19.8)1 (5.9)0 (0)Arterial hypertension44 (39.6)8 (47.1)2 (50)Diabetes mellitus4 (3.6)1 (5.9)1 (50)Hyperlipidemia27 (24.3)2 (11.8)1 (50)Cardiac arrhythmias12 (10.8)2 (11.8)1 (50)History of cancer5 (4.5)1 (5.9)0 (0)Chronic bronchitis4 (3.6)1 (5.9)0 (0)Asthma3 (2.7%)0 (0)0 (0)Hospitalized in previous 12 months21 (18.9)3 (17.6)0 (0)Surgery with general anaesthesia in previous 12 months11 (9.9)2 (11.8)0 (0)Ack owledgementsThe authors thank Elena Cannavò and the CHRIS study team, whose support was of invaluable importance for the conduction of the study.Disclosure of InterestsNone Declared.