**7.2 Acute pouchitis**

The inflammation of the IPAA can appear in acute (60%) or chronic (60%) form. Kayal et al. state 53% that acute pouchitis occurred in 205 patients (53%), 60 of whom (30%) progressed to chronic pouchitis [34].

Hashavia et al. followed prospectively 201 UC patients who underwent IPAA (1981–2009 for a mean of 108 months). A total of 138 (69%) of these had either a regular pouch or episodes of acute pouchitis and 63 (31%) developed chronic pouchitis [35].
