except when you have a heart already sick from critical illness or viral cardiomyopathy. Even you should know when the EF is less than 35% there is an enhanced risk of malignant and fatal arrhythmias. The last couple patients i gave hydroxychloroquine to before they negative studies came out had to have it stopped due to Qtc prolongation. Despite what many wish this is not the drug to use in seriously ill patients with Covid
Which is why we don’t wait until the patient is dying to administer the drug regimen that has been proven effective when administered earlier.