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.
A shunt is a tube that is put in, starting inside one of your brain ventricles and is then tunneled under your scalp and beneath the skin along your neck and chest. The tail end of the tube is put inside the space around your stomach. Extra fluid inside your brain can then drain from the brain into your abdomen.