A very small study, but promising. They found that the metroprolol treatment reduced neutrophil infiltration of the lungs. They should look at the blood vessels too, there is a similar problem of neutrophils (leukocytes) moving to the sites of inflammation (causing blood clotting). In India, they use colchicine to fix that ("this is an easy disease to treat"): https://odysee.com/@DrMobeenSyed:1/dr.-darrell-demello-discusses-covid-3:1