ECG machine situation

[Fabrikant]

Here is a hypothetical situation. I have several cardiograms which I know belong to certain individual and they are all abnormal. Now, I have another cardiogram which is being claimed to be the same individual and it is normal. Is there any way to prove that the cardiogram indeed describes the same individual by using his abnormal cardiograms? The question can be inverted, namely, is there anyway to prove that "normal" cardiogram is fictitious. In other words, does any cardiogram contain certain set of numbers which can be interpreted like finger prints which are unique to a specific individual.

[Fritzieswife]

Also, there is no "fingerprint" other than medical number which can have digits transposed if manually entered. Did the person have an id band that was scanned by computer?

[Fabrikant]

There was no id band scanned by the computer. Every human has fingerprints which are unique to him. Why shouldn't his cardiogram have some identifying properties unique to this individual.

[Fritzieswife]

I would tend to believe it would depend on the quality of the ecg, particular arrhythmia, placement of leads, and new medications. Need more info.