Here are references from a PubMed search of the question concepts:  tranportation within the hospital and critically ill patients.  For a more specific search, add an outcome term to the search.

(“Transportation of Patients”[MeSH Terms] OR transport OR “Patient Transfer”[mesh terms]) AND intrahospital AND (critical care OR critically ill OR critical illness OR critical illnesses) Limit:  English

These references include reviews, prospective and retrospective studies, and guidelines.

Reviewed 4/15/2014 ldt