Ключевые слова: analyse, analysis, backgrounds, beat, blood, cardiac, cardio, cardiogram, cardiological, cardiologist, cardiology, care, circulation, clinic, diagnose, diagnosis, disease, ecg, ekg, electrocardiogram, electrocardiograph, emergency, frequency, graph, health, health care, healthcare, healthy, heart, heart attack, heartbeat, letters, line, medical, medicine, message, monitor, patient, prevention, pulse, rhythm, significance, sos, stress, test, warning, white,