I suppose it will depend on what problem you have had, however I do not think that about 2500m elevation will have too much effect on your heart. But be aware of coldness, depending on your problems this can have a big effect.
An elevation change of 3000 feet is a significant distance, and a huge change in the density of the oxygen level. You didn't specify what kind of heart trouble you have, but any extra demand on a damaged/unhealthy heart needs to be discussed with your doctor.
I would need to travel from near sea level to about 3,400 feet when I was experiencing heart artery blockage symptoms, and I certainly noticed how the change in altitude affected my angina.
Perhaps you could take oxygen along 'just in case'?
Had chest pains, went to the emergency room and was told I needed a cardiac catheterization to see what the problem was. I had two stents put in and came home in 4 days. My platelets were 250,000 when I went in the hospital and after the procedure they were at 25,000. Don't know exactly what happened but I do know my blood pressure went very low and after the next blood work my platelets were almost gone. I got home (3 days in hospital CCU) at 4 PM and at 12.45AM the next morning I had a heart attack, terrible pain, profusely sweating my wife call 911. They did another catheterization to see what had happened. The two stents had closed completely. My platelets are back to normal now.
Thanks for your comment and advise.