AB0676 One year progression of interstitial lung disease in connective tissue diseases. A descriptive study in a single tertiary center. | Annals of the Rheumatic Diseases

Abstract

Background: Interstitial lung disease (ILD) in connective tissue diseases (CTD) is an important cause of morbidity and mortalitiy. Objectives: To evaluate ILD in CTD (systemic sclerosis, myositis, Sjögren syndrome, rheumatoid arthritis, mixed connective tissue disease), sarcoidosis and interstitial pneumonia with autoimmune features and its progression in 12 months evaluated through high resolution computed tomography (HRCT) and pulmonary function test (PFT). Methods: A retrospective single tertiary center cohort study in CTD-ILD outpatients seen between 2012 and 2021. Clinical, serological data, PFT and HRCT results were collected. ILD patterns were classifed into: usual interstitial pneumonia (UIP), inconsistent UIP, nonspecifc interstitial pneumonia (NSIP), fbrosing NSIP, organizing pneumonia, interstitial lymphoid pneumonia and associated to sarcoidosis. Progression of ILD was defned as:->10% decline in FVC in PFT.->15% decline in DLCO in PFT.-Progression of fbrosis in HRCT. IBM SPSS v23 was used for statistical analysis. Results: 51 patients were collected. Baseline characteristics are shown in Table 1. Figure 1 shows ILD progression in 1 year. During follow up, 1 patient with sarcoidosis died of COVID19 bilateral pneumonia. Conclusion: In our series most patients were middle aged women. Anti-Ro antibodies and smoking status (former or current) were common among patients. Common clinical features were Raynaud (45%), skin affection (45%) and arthritis (40%). 47% of the patients expressed dyspnea at ILD diagnosis. 29,4% were treated with MP pulses, 23,5% with rituximab, 31,4% with mycofenolate mophetil. Fibrosing pattern in HRCT (UIP and fb-NSIP) was the most prevalent. 20% of the patients had progressive fbrosis under PFT criteria and 18% under HCRT. More studies of ILD-CTD are necessary to identify factors for progression and response to treatment and throw out more conclusions of prediction and prognosis of disease.