Coronary Artery Dissection

  I am 40 years old.  A little over a year ago, I experienced a spontaneous dissection of my right coronary artery.  There were no special circumstances, i.e., post pregnancy, artery disease, etc.  After many specialist visits and tests, general concensus is that the Drs. don't know why it happened and can't tell me if it will happen again.  There appears to be very little information available to me.  I have been tested for collagen vascular diseases, results were negative.  Tested also for autoimmune diseases, results also negative.  I have resumed my pre=episode lifestyle which includes playing tennis 2 - 3 times per week and running around after my kids (ages 7 & 11).  I am frightened that this will happen again since I had no warning until the heart attack that anything was wrong. The only information I have been given by my cardiologists is that if you survive the initial episode, then your chances of never having problems again is very high.   I am simply looking for more information on the subject.  Any ideas?
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Dear Susan,
Coronary dissection is a relatively rare event.  There are numerous causes.  High blood pressure, the post-pregnancy state, cocaine use, Marfan