EDN1 and COVID-19: A small Swiss study measured endothelin-1 precursor peptide (proET-1) in 74 hospitalized patients with COVID-19 and, while numerically higher levels of proET-1 were reported in non-survivors (median, 81.8 pmol/L; IQR, 76 to 118 vs. median, 53.6; IQR, 37 to 69), no significant association with mortality was found upon multivariable logistic regression.