Mr. Malo, you are putting a balloon into a blood vessel, a vein with a weak wall, and enlarging that vein. Is the procedure 100% safe? I know of no procedure, even eating natural food, that is 100% safe.
The question we must ask ourselves with any procedure is whether the benefits outweigh the risks. That is what we want to find out. We want to make sure that the benefits associated with this procedure significantly outweigh the risks inherent in any procedure. That is evidence-based practice.