I believe that the shunt should provide your son with immediate relief. The biggest problem with the shunt's is that they do not last long. I have had 4 in 4 years. But when they are funtioning I have a normal life. Once the shunt fails my symptoms return very quickly and I have to get the shunt replaced. I have it down to a Science now and have even had the shunt surguries done as an outpatient procedure. When I had the first one put in I was in the hospital for a week. I have had this condition for 5 years now and it was originally brought on by a reaction to tetracycline.