I would think not, and this is not one that you want to miss. The CTA is a good test especially in young people with non calcified vessels, but is is not 100% sensitive. A left heart cath will leave no doubts about the results, and the benefit is that they can perform an intervention at the time of the procedure. If you miss a lesion in your LAD, especially with your symptoms and poor exercise capacity, you may later on develop worsening heart failure or a heart attack. I would recommend proceeding with a left heart cath over the CTA for this reason.
Bottom line, i guess the main thing i'm wondering is..if CTA is normal then can I move on and forget about this? Would a normal CTA "over ride" this "abnormal" stress test?
Doc thanks for the reply, when you said "you may later on develop worsening heart failure", did you mean to imply it sounds like i already have some form of heart failure?
So, if i have the CTA and it's normal, I would still want to get a cath, if i've already done the CTA?