One of the medical term that I am confused of, is this abbreviation called ecg , not until I searched for the meaning about the medical machine to make me understand more of the process. According to what I have read, ECG was derived from the Greek word Electro , because it is related to electrical activity and while Cardio is Greek word for heart , and graph, for Greek meaning to write.
The Electro machine is said to best measure and diagnose abnormal rhythms of the heart particularly abnormal rhythms caused by damage to the conductive tissue that carries signals, or abnormal rhythms cause by electrolyte imbalance. Amazing Isn't it, that this invention was born. Electrocardiograph, already helped a countless heart for decades now.