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).
Other conditions sometimes associated with Chiari malformation include hydrocephalus, syringomyelia, spinal curvature, tethered spinal cord syndrome, and connective tissue disorders such as Ehlers-Danlos syndrome and Marfan syndrome. Chiari malformation is the most frequently used term for this set of conditions.
Someone may have a Type I Chiari malformation for years without knowing it â Chiari often produces no symptoms until adolescence or early adulthood. The malformation is sometimes identified when a patient has an MRI scan for another reason, but it's more typically identified after symptoms begin to appear. Those symptoms may include: 1  Headache that gets worse with exertion, including exercise, coughing, sneezing, or laughing. 2  Neck pain, specifically at the base of the neck or between the shoulder blades. 3  Dizziness. 4  Tingling or numbness, usually in the hands (and rarely in the legs) 5  Unsteady gait. 6  Loss of fine motor skills.