Oh my, another sympathy like.
I also have a heart condition called Supraventricular Tachycardia. They told me it would get worse over time and that I would eventually need an operation to correct it. Crazy thing is, I haven't had an event since Dec. of '08...knock on wood (my head).

I've had my heart rate tracked on a hospital monitor as high as 230 bpm...!!!!!

I've had to be converted with idenosine twice. So not fun. They, basically, flatline you to get your heart back into a normal rhythm, and you feel it. I can't even explain the feeling to anyone who hasn't experienced it before...

The last time in the ambulance in '08, the nice lady asked me if I had to have it done before, and I answered "Yes"
She then said... "Well, then, you know I'm gonna' hafta' kill ya' for a few seconds to save ya".
Yep, just get it over with...
And, I'm still here...!!!!!!!!!!!