Remdesivir is cardiotoxic. Side effects include bradycardia, long QT, afib (shortens atrial action potential and refractoriness), complete heart block, cardiac arrest. We knew by then that Remdesivir's efficacy was kinda, meh, (veterans study july 2021, WHO nov 2021). So, completely contraindicated in your case. And to think you went in for a little bag of fluid, instead got to dodge a bullet.