It is hard to say for sure what is going on. It is good to know that you do not have blockages.
I assume they looked into the abnormal heart rhythm you had after the stress test and determined that it was not dangerous.
If you have structurally normal heart on echocardiogram (ultrasound), that would be encouraging. Sometimes we never know why people develop a left bundle branch block. Typically if I see a left bundle and the heart is structurally normal, I would continue to follow over time to make sure the heart function stays normal. It is tough to trouble shoot the shortness of breath without seeing the studies. Checking a blood BNP level ( brain natrietic peptide) helps determine if the cause of shortness of breath is cardiac related.
I hope this helps, thanks for posting.
http://www.medhelp.org/posts/show/483543#
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