At the age of 20 I went for an initial Class 1 medical and my ECG reading was all over the place.
The CAA refered me to a hospital in Chertsey where I had an Ultrasound on my heart - No Problem was found.
The CAA later fitted with a 24hr heart recorder, which recorded the my heart over a 24hr period. - No Problem was found.
I then returned to the CAA, again. This time I did a "stress test", basically walking on a treadmill that had an incline that got steeper and steeper while monitered to a heart machine. - No Problem was found.
They issued my Class 1 medical. They put it down to just nerves.
As a footnote, in Febuary I renewed my medical at Gatwick. I got sight of my 20 yr old ECG. After speaking to the Doctor and looking at how erratic my heartbeat was then, I was impressed with the way the CAA looked at this initial problem and looked at ways to see if there was a
real problem with my heart.