[Inflammatory rheumatic diseases in patients with post-COVID syndrome]

The post-COVID syndrome (PCS) describes long-lasting symptoms after a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection. PCS and rheumatic diseases, especially collagenoses, show strong overlap of symptoms and biomarkers. Thus far, no biomarkers that differentiate between PCS patients with and without rheumatic diseases exist, and data on the prevalence of rheumatic diseases in this collective in Germany is scarce.

Based on the online platform DEFEAT-Corona, 80 people with PCS without a previously confirmed inflammatory rheumatic disease (IRD) and interest in a rheumatological evaluation were recruited. Typical complaints of PCS and rheumatic diseases were analyzed. In addition, comprehensive laboratory analyses were conducted.

In 6.25% (n = 5) of the PCS patients,IRD was suspected or confirmed. The remaining 75 PCS patients without IRD also showed a high degree of overlap with regard to complaints typical for rheumatic disease or PCS. The inflammation parameters C‑reactive protein (CRP) and erythrocyte sedimentation rate (ESR) were significantly higher in PCS patients with suspected IRD compared to patients with PCS only and significantly more often exceeded normal range.

This study illustrates the high degree of overlap between PCS and rheumatic symptoms in PCS patients without previous suspicion of IRD. The risk for IRD could be elevated in PCS. However, in the view of the authors, PCS without additional risk factors, such as elevated CRP or arthritis, does not generally justify rheumatological evaluation in clinical routine. This recommendation should be further investigated in larger studies.