ICU psychosis is a disorder in which patients in an intensive care unit (ICU) or a similar setting experience a cluster of serious psychiatric symptoms. Another term that may be used interchangeably for ICU psychosis is ICU syndrome. ICU psychosis is also a form of delirium, or acute brain failure.The prevalence and incidence of delirium of adults in the ICU setting in this study was high and comparable to prior studies. There are several significant risk factors associated with delirium which could be modified. These factors should be considered when designing effective preventive strategies of delirium.