Ключевые слова: analysis, analyze, beating, body, cardiac, cardio, cardiogram, cardiograph, cardiology, chart, child, clinic, diagnosis, doctor, electrocardiogram, electrocardiograph, equipment, frequency, graph, graphic, health, health care, healthcare, healthy, heart, hospital, illness, medical, medicine, nobody, paper, patient, printout, problem, pulse, rhythm, science, sick, test, the result, trace, treatment,