Though some of us are probably still confused about the difference between PEO and MOHO, this link does a pretty excellent job of explaining the theory and detailing its applicability to the ICU environment. It evens provides a case examples and specific PEO interventions that lend themselves to the high acuity setting of the ICU.
https://www.aota.org/Publications-News/SISQuarterly/Physical%20Disabilities/8-16-measure-assess.aspx