Portosystemis Shunt (PSS) For a Puppy?

I have a 4.5 month old Siberian Husky. Does anyone have information on PSS (Portosystemis Shunt). I'm waiting on blood results to come back for my puppy after he had some kind of seizure fit the other night. Has anyone had a pet that has had this PSS done that might know more about it's symptoms etc. I would be grateful if anyone can help. Thanks.