Running/heart question

I am a 36 year old male. For about two years I have been running. I have mostly just ran 5k's but havine been training for a marathon in April. I am running about 30-37 miles a week, with a long run of about 2 hours on Saturdays. My heart rate sometimes gets into the 90% range of my MHR.

Before I started running, on a regular docotr visit about 6 years ago they found a heart murmur. I had a normal ekg and echo. They said not to worry about it. I also had a normal stress test back then. (Without the dye.) I also developed "short runs" of SVT's. They only last a few seconds. It is like my heart stops beats very fast for 3 seconds, then goes back to normal. Sometimes, I can make it happen by laying on my right side.

Anyway. I have recently had a normal ekg, also, I wore a holter rmonitor during a 13.2 outside run. The report came back normal.

I still get the "short runs" of SVT's ocassionally. And i think they are scaring me and might be leading to an anxiety attack where I just dont feel right.

Anyway, after my long runs on the weekends, I am just wiped out. I dont feel like doing anythign the rest of the day and soemtiems feel funny.

Just wondering how safe running was especially for a marathon. (Which I will probably do once then go back to shorter distances).

Also, how to know when these feels are just anxiety and when shoud I be concerned?

Thanks Again!

[cillakae]

How long did you wear the holter monitor?  Did you have any episodes while wearing it?You should try wearing one longer term, especially since you already know you get SVT's.  If you are able to catch these while wearing the monitor, then the cardiologist should know of some way to treat it.   My son is getting a holter monitor today that he will wear for 30 days straight.  We haven't been able to find anything wrong with him yet, but he is having fainting spells.  If he doesn't have a fainting spell while wearing the 30 day monitor, then we will get the one that you can wear up to 3 years.  The monitor is supposed to record if anything happens to the heart during an episode weather it is fainting or palpitations or skipping beats,etc.

I hope this helps!  Good luck to you.