heart rate on paper for recording an electrocardiogram, prevention of heart diseases. electrocardiogram strips with

arrhythmias arrhythmic artery atrial beat block bundle cardiac cardio cardiogram cardiology care checkup circulatory clinic closeup diagnose disease ecg ectopic ekg electrical electrocardiogram electrocardiography examine fibrillation graph graphic health heart heartbeat infarct medical medicine paper print pulse rate result rhythm right science sinus strip tachycardia test ventricular ventriculonector waveform