By Dale DenwaltStaff writer ddenwalt@oklahoman.comThe Food and Drug Administration gave remarkably quick, temporary approval to a cardiac monitoring device that helps doctors monitor patients who take a controversial COVID-19 treatment.The device, created by Oklahoma City-founded AliveCor and cardiologist David Albert, M.D., is a personal electrocardiogram that can monitor what's known as QT prolongation.QT prolongation can cause a person's heart to have a potentially deadly arrhythmia, and can develop after taking the drugs hydroxychloroquine and azithromycin.The drugs are being used by doctors to treat some patients with COVID-19, and it's been touted by President Donald Trump as a possible treatment despite the current lack of vigorous research into its off-label use.Read more on NewsOK.com