Hello everyone,

I work on the cardiac pre-ejection period (PEP) using Biopac ECG/ICG. I record cardiac activity on non-patient healthy adults from 18 to 65 years, during rest or cognitive and stress tasks.

In my sample, most PEP values are quiet stable, although differing as a function of participants and conditions. In some very few participants, I observe moment-to-moment important variations in successive PEP values. For example, one participant with a mean PEP value of 100 ms (4 minutes recording), shows sometimes those successives PEP values: 61-127-179-69-112. When I look at the signal and the B-point positionning, everything seem correct.

Is there anyone in the community who is aware of what is considered as "normal", or inversely considered as abnormal or "outlier" concerning successive values of PEP in a normal cardiac recording?

I do not wonder about the average values but about the successive PEP values, from beat-to-beat.

Thank-you for your help.

Sincerely,

Cédric