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Irregular Heart Beat - Adderall

About 3 weeks ago I started feeling an irregular heartbeat every 5 minutes or so, combined with a jumping sensation in my chest.  I also feel noticeably more short of breath than I used to, and I have to take deep, full breaths to overcome the feeling.

I went to a cardiologist who took an EKG. He said I had premature ventricular contractions that were likely benign, and that I shouldn't worry about it. My EKG looked "normal".

I am 23 years old and otherwise healthy, but there is something I did not tell my cardiologist out of embarrassment and fear -- last semester at college there were several times when I took around 200mgs of Adderall within a 24-36hr period to stay up and work on homework, and a few more times when I took less than that but more than one is normally supposed to. Other than that, I took a more normal dosage (about 20-40mgs), for a total sum of probably about 20 days.

Clearly I should not have done that, and I certainly won't do it again.  Now I am constantly paranoid every day that I have done something to my heart.

The last time I took Adderall was over a month (about 45 days) before I consciously felt my first skipped heart beat.  Between my last Adderall and my first skipped beat, I lived a very healthy lifestyle (no substances) and exercised vigorously.

My questions are:

1. What relationship could there be between the Adderall I took and my current irregular heart beat?

2. What type of heart damage could my Adderall use have caused, and how likely is it that it did?

3. My doctor tells me that it is fine for me to exercise vigorously (sprint, lift heavy weights, etc), and that I shouldn't worry about my PVC's at all.  But, he did not know about the Adderall.  Does the Adderall that I took change the analysis of the situation?

4. What additional tests should I get in order to really get to the bottom of this, and to get the final word on my PVC's and any damage I might have from the Adderall?  Time and money are not a factor.

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1. If there was not an immediate response (increased PVCs are you took the medication) there is probably no connection.  You will never know for sure, but it is unlikely.

2. I am glad to hear that you aren't going to do that again.  If a patient told me that they had taken some stimulants and were worried that it did damage, I probably would order an echo to make sure the the heart is structurally normal and I may use a monitor to see how frequent the rhythm is.  It is unlikely that you did harm. If the echo is normal, that shows that there is no macro damage, but there is no way to know if there were changes on a microscopic level.  The best you can do now is not do it again.

3. It probably doesn't, but you should give your doctor the opportunity to make that decision.  

4. When I see someone for symptomatic PVCs (adderall or no adderall), I usually check a holter to help determine frequency, order an echo to make sure the heart looks structurally normal, and sometimes a stress test depending on the circumstances.

I hope this helps.
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