I started my Cardiac Rehab lost Monday. Had a 2 hour session with a rehab specialist to figure out at what levle I should work out at. Then on Wednesday I worked out for about 1-1/4 at the rehab center. 5 minutes of warm up and then 15 minur workout on the tread mill. Then another 15 on an exercise bike followed by another 15 on the tread mill again. All things a GO on Wendesday. Went back on Friday, and every thing was fine until about 5 minutes into the bike ride, then my heart sped up a lot and I got light headed for 2 to 3 seconds, and then back to normal. Finished up on the bike okay and then did the last 15 on the tread mill, with NO isuues. After the workout, I talked to the tech and ske told my the heart monitor I was hooked up to showed a very high heart rate when I was on the bike which was when I got light headed, so she had me go up the the third floor to see the cardiac doctors. After the doctors looked at the print out of my heart montor readings, they have me schuduled for MORE tests today at 3>00PM to sse if they can figure out what made my heart speed up so much with only Light workout level I was on. They will be trying to MAKE my heat do what it did Friday, so they can fighure out how to treat it so it does not happen again. The PLUMBING of my heart is okay after the 3 stents were installed, so now they will be looking at the ELECTIAL fuction of my heart to find the problem. This was the FIRST tiem my heart sped up that much in 4 weeks, so it's NOT an easy thing to figure out, since it's NOT all the time or even close to it. 2 or 3 secs of fast heart rate in a 4 week period is NOT much, but it's still TOO much if it were to kill me in those 3 seconds.