That's a great question.

I have looked at the US News rankings. They rank hospitals by the illness treated.

Here's a top ten in the area of aorta surgery: https://health.usnews.com/health-care/best-hospitals/slideshows/best-hospitals-for-cardiology-heart-surgery?onepage

Here's a ranking for what might be the hospital you are going to: https://health.usnews.com/best-hospitals/area/co/university-of-colorado-hospital-6840430

I am far outside the medical community and happily don't have much experience with surgeries. Hope this helps.