Ключевые слова: attack, background, beat, bed, black, blood, cardio, cardiogram, cardiology, care, chart, clinic, closeup, computer, concept, death, diagnosis, ecg, ekg, electrical, electrocardiogram, emergency, equipment, exam, graph, graphic, health, healthcare, heart, hospital, illness, isolated, life, machine, macro, medical, medicine, monitoring, paper, patient, people, printout, pulse, research, science, sick, technology, test, thermometer,