http://www.fda.gov/MedicalDevices/Pr.../ucm123676.htm
To restate, using bed rails to keep patients in bed is an intervention. Like any and all interventions we nurses perform it can do both harm and good. There can be almost no blanket covering policy that fits all situations. It is up to each of us to provide for the safety of each of our patients. In an icu with my monitors producing cvp, wedge, icp and such I cannot lower the bed to the floor. I need it level with equipment and high enough for the patient to be seen. Bed rails can be used here with very frequent (even for ICU standards) direct nurse monitoring.
If my patient is AxO with no hx of dementia or other neuro problems I will leave just the top 2 rails up so that they have something to hold on to when they turn or sit up.
I feel both provide for the safety and comfort of both patient and nurse. You may encounter the odd exception, as I myself did but, if you view them as the intervention they are you should be ok.
Nursing News