PT in the ICU

A study recently cited by the APTA says that patients who begin physical therapy while still in the
ICU often reduce the length of their hospital stays.
 
The research, conducted by Peter Morris, M.D., associate professor in the Section on
Pulmonary, Critical Care, Allergy and Immunologic Diseases at Wake Forest University
Baptist Medical Center, showed that the length of stay for a group of respiratory-failure
patients who received early mobilization and PT within 48 hours of the insertion of a
breathing tube was reduced by an average of three days compared with the stay for patients
who did not receive the therapy.

In addition to tubes, many ICU patients are connected to other equipment or machines that
can make it hard to perform therapy. How do you work around this paraphernalia
when giving PT to patients in the ICU? Are there any circumstances in which you would
not want to perform PT in the ICU?