Ключевые слова: background, beat, blood, cardiogram, cardiograms, cardiologist, cardiology, care, color, composition, concept, consultation, diagnosis, different, disease, doctor, examination, flat, grey, health, heart, heartbeat, hearts, illness, lay, light, many, medic, medical, medicine, nobody, object, paper, patient, pressure, prevention, pulse, rhythm, service, sickness, stethoscope, stethoscopes, tool, top, treatment, view,