Ключевые слова: abstract, background, beat, cardiac, cardio, cardiogram, cardiograph, cardiology, care, chart, computer, curve, diagnosis, display, ecg, ekg, electrocardiogram, emergency, female, fitness, frequency, gadget, graph, graphic, health, health backgrounds, healthy, heart, heartbeat, hospital, icon, life, lifestyle, line, medical, medicine, monitor, person, pulse, rate, rhythm, screen, smart, smartwatch, sport, symbol, technology, training, watch, wave,