What is the definition of spastic ileus?

Ileus: Ileus is the development of distention of the intestines as a result of decreased peristaltic motility. Usually this is the response of the gut to some type of noxious stimulus, either traumatic, infectious or inflammatory. The distension can mimic bowel obstruction and this needs to be differentiated, typically by watchful waiting. Ileus will resolve by correcting the underlying cause.

Spastic ileus: Sounds fancy but not sure if such diagnosis exists. Can have a functional ileus or mechanical ileus. Both have different causes