electrocardiogram strips with cardiac arrhythmias. alterations of heartbeats represented on paper. selective focus on some beats.

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