I had a similar problem re my medical.
The new ECG machines are very much better and pick up and self 'diagnose' .
I've had a right bundle branch block for years and been ok but last year the machine added First Degree Heart Block and I had my medical revoked.
Ended up having a 24 hr ECG, electrocardiogram and a Bruce protocol (12 mins on a treadmill plus ecg).
Pleased to say all ok and waiting to get medical back.
Shouldn't worry unduly but I did go and see my own Doc as well.