Heart Rate Unresponsive To Exercise

[rogergordon]

I am 69 years old and had a mitral valve repair last September, immediately following which I was in atrial fibrillation and given Amiodarone and Warfarin. This has now settled and I now have first degree heart block and am doing a cardiac rehab programme. My resting heart rate is 80 and my target exercise range is 101 - 113 but it only goes up to 98 during exercise (15 on Borg scale). Can you suggest what is causing this and what the implications / remedies may be.
Many thanks, R

[rogergordon]

Thanks will do.

[achillea]

Since you have had a mitral valve repair, atrial fib, and are on several medications, you might want to post your question in the expert forum, where doctors more familiar with this kind of problem do answer:

http://www.medhelp.org/forums/Heart-Disease/show/114