Ключевые слова: amplitude, analyse, analysis, analyze, background, beat, blood, cardiac, cardio, cardiogram, cardiograph, cardiologist, cardiology, care, chart, clinic, diagnose, diagnosis, diagram, disease, ecg, ekg, electrocardiogram, electrocardiograph, emergency, equipment, frequency, graph, graphic, health, healthcare, healthy, heart, heartbeat, hospital, illness, life, medical, medicine, nobody, paper, pattern, pulsating, pulse, research, rhythm, science, test, trace,