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.
Headache was also common (about 80%). These symptoms overlap with those of Meniereâs disease as well as to lesser extent, migraine (Sperling et al, 2001) Signs of a significant Chiari malformation often include downbeat nystagmus, poor visual pursuit for age, and alternating skew deviation. Occasionally patients will have sensorineural hearing loss Heuer et al., 2008). A few individuals with the Chiari malformation develop progressive neurological symptoms. These may include unsteadiness, vertigo, headache, weakness or numbness.