COVID-19 Associated Endothelial Dysfunction Study

"* Vascular occlusion test (VOT) performed on the arm. Measurement of the quality of tissue reperfusion by NIRS on the thenar eminence and the digital perfusion index.~* Microcirculation reactivity is measured for each patient with a laser speckle contrast imaging (LSCI) placed on the forearm. Tests will be performed for evaluation of microvascular reactivity: Acetylcholine and Nitroprusside Iontophoresis.~* Morphological analysis of the microcirculation by sublingual videomicroscopy."