Ключевые слова: backgrounds, beating, cardiogram, cardiograph, concept, data, death, digitally, display, doctor, ecg, electro, equipment, exercise, frequency, glass, graph, graphic, health, healthcare, healthy, heart, heartbeat, human, lens, life, lifestyle, line, magnifier, medical, medicine, monitoring, motion, perspective, pressure, pulsating, pulse, science, sign, speed, sport, survival, symbol, technical, technology, test, trace, visual, wave,