When a population or group of something is declining, and the amount that decreases is proportional to the size of the population, it's called exponential decay. In exponential decay, the total value decreases but the proportion that leaves remains constant over time.
A ventriculoperitoneal (VP) shunt is a medical device that relieves pressure on the brain caused by fluid accumulation. VP shunting is a surgical procedure that primarily treats a condition called hydrocephalus. This condition occurs when excess cerebrospinal fluid (CSF) collects in the brainâs ventricles. CSF cushions your brain and protects it from injury inside your skull.
What is a shunt? A shunt is a tube, akin to plumbing, that diverts cerebrospinal fluid (CSF) from the brain to an alternate compartment in the body (in most cases the abdominal or peritoneal cavity). A shunt is implanted to treat hydrocephalus or excess fluid in the brain (with resultant enlargement of the ventricles).