A trigger (from the Dutch trekken, meaning to pull) is a lever which, when pulled by the finger, releases the hammer on a firearm. In a database, a trigger is a set of Structured Query Language (SQL) statements that automatically fires off an action when a specific operation, such as changing data in a table, occurs. A trigger consists of an event (an INSERT, DELETE, or UPDATE statement issued against an associated table) and an action (the related procedure).
There are a wide variety of conditions that can be considered in the differential diagnosis of a Chiari malformation. The symptoms commonly associated with a Chiari malformation are vague and common to numerous other conditions. Some disorders are common misdiagnoses for individuals with a Chiari malformation. Such conditions include multiple sclerosis, chronic fatigue syndrome, fibromyalgia and spinal cord tumors.
A Chiari malformation (sometimes called an Arnold Chiari) means that the lower parts of your brain have been pushed downwards towards your spinal cord, so they are below the entrance to your skull. Most people will have a type 1 Chiari malformation, which is the least serious form of the disease.This is where the lowest part of the back of the brain (the cerebellar tonsils) drops down into the top of the spinal canal. Types 2 and 3 Chiari malformations are less common and more serious.sually, the lower parts of the brain are contained in a space within the skull, above the level of the foramen magnum (opening at the base of the skull). If you have a type 1 Chiari malformation, these brain parts are pushed downwards, because they are too big for the skull.