COVID-19 is known for affecting the lungs and respiratory system, and now cardiologists are warning of potential COVID-19 complications affecting the heart. According to the American Heart Association, heart disease is expected to rise significantly post-COVID-19. Dr. Ken Mahaffey, a cardiologist and associate dean of clinical research at Stanford University, told KCBS Radio that the commonly known pulmonary problems associated with COVID-19 can also put a strain on the heart.