If you mean the one at 35, my understanding is it's just a baseline. Like, unless you're obviously about to expire, the purpose of it is to have something from when you *weren't* a fossil to compare to later.
I already know about a cardiac issue that was found in an EKG back in 2012. I reported it then, and this year my first required FAA EKG came up, same issue, my AME had no issues with it since it was PRNC and hasn’t gotten worse...I actually got another one last month in prep for my Flight Physical, exact same item. It is what it is, the strip doesn’t lie.