<b>Association of G-Protein-Coupled Receptors autoantibodies with vasoregulation in Post-COVID</b>

We performed a cross-sectional study, enrolling 80 patients with Post-COVID and 54 individuals with a history of SARS-CoV-2 infection without persisting symptoms (control group). ELISA measurement of GPCR autoantibodies encompassed autoantibodies to Angiotensin-II-Receptor-1 (AGTR2), Beta-1 Adrenergic Receptor (ADRB1), Beta-2 Adrenergic Receptor (ADRB2), Endothelin Receptor (EDNRA), Muscarinergic Choline Receptor 3 (CHRM3), and Muscarinergic Choline Receptor 4 (CHRM4). Endothelium-dependent vasodilation was assessed by flow mediated dilation (FMD). Measurement of central aortic blood pressure and capillary nailfold capillary microscopy were performed as additional assessments of vasoregulatory function. Lipoprotein-associated phospholipase A2 (Lp-PLA2) served as markers of vascular inflammation.