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.
Diagnosis of Chiari is often made as the result of routine x-ray, MRI or CT imaging of the skull and upper neck or the lumbar spine, often for Migraine or other disorders. 3D CTA and 3D MRI are preferred for the doctorâs best impression and diagnosis of Chiari malformation as well as surgical preparation.