Ключевые слова: 3 years, amplitude, arrhythmia, blue, cardio, cardiogram, cardiograph, cardiology, care, chart, children, clinic, curve, data, diagnosis, document, ecg, ekg, electrocardiogram, graph, graphic, health, health care, healthy, healthy lifestyle, heart, heartbeat, heartbeat line, horizontal, hospital, medical, medicine, monitor, monitoring, paper, print, pulsating, pulse, research, result, schedule, science, scientific, technology, test, treatment, wave,