Ключевые слова: analysis, analyze, background, beat, cardiac, cardiogram, cardiologist, cardiology, care, chart, clinic, covid19, diagnose, diagnosis, diagnostic, disease, doctor, ecg, ekg, electrocardiogram, emergency, equipment, examination, graph, health, health care, healthy, heart, heartbeat, hospital, ill, illness, life, medical, medicine, mitral, monitor, paper, prolapse, pulse, rate, red, research, rhythm, science, sick, stethoscope, test, valve,