ecg set

abstract arrest asystole attack background beat beats black cardiac cardio cardiogram cardiograph cardiological cardiology cardiovascular care chart complex computer curve cycle death detail diagnose diagnosis digital disease doctor duty ecg ekg electrical electro electrocardiogram electrocardiograph emergency examination examine failure fit frequency graph graphic grid health healthcare healthy heart heartbeat hearts hospital ill illness illustration internal line medical medicine monitor monitoring normal physiological pressure pulse qrs rate rates rhythm sick sinus spike stability symbol syndrome systole treatment unstable urgent vector waves