I recently saw Dr. Systrom at Brigham and Women's Hospital in Boston, and he suggested having an advanced CPET (the kind where they put in a couple of catheters before you exercise). Have any of you ever had this test before? What did it feel like? How did it go? Did you recover easily? Did you receive useful data from it? I'm a little (okay...very!) nervous, and I'm on the fence about scheduling it.