As the name suggests, drywall is used to create walls and ceilings inside a house or other structure where it will not be exposed to the elements. In the US, houses older than 1917 will not have drywall unless later remodeling was done. 1917 was when the U.S. Gypsum Company introduced the product to the US market.
Communicating hydrocephalus, also known as non-obstructive hydrocephalus, is caused by impaired cerebrospinal fluid reabsorption in the absence of any CSF-flow obstruction between the ventricles and subarachnoid space.ydrocephalus is usually due to blockage of cerebrospinal fluid (CSF) outflow in the ventricles or in the subarachnoid space over the brain. In a person without hydrocephalus, CSF continuously circulates through the brain, its ventricles and the spinal cord and is continuously drained away into the circulatory system.
Normal pressure hydrocephalus (NPH) is a type of hydrocephalus that usually occurs in older adults. The average age of person with NPH is over age 60.NPH is different than other types of hydrocephalus in that it develops slowly over time. The drainage of CSF is blocked gradually, and the excess fluid builds up slowly.The slow enlargement of the ventricles means that the fluid pressure in the brain may not be as high as in other types of hydrocephalus.ydrocephalus is a condition in which there is too much CSF in the ventricles. This occurs when the natural system for draining and absorbing extra CSF does not work right. The ventricles enlarge to accommodate the extra fluid and then press on different parts of the brain, causing a number of different symptoms.