Multiple Personality Disorder (MPD) is more common than one may think. There are many people with undiagnosed MPD. 2. As a caring, effective nurse for MPDs, set boundaries. Clients with MPD need to feel safe with the nurses with whom they talk. It is essential to establish a trusting bond. Respect each patient's alters--and believe in them. They will come out when they feel safe. Be direct and honest. 3. Do not play games. Although it is fascinating to watch the switch take place, it can be extremely frightening for an MPD patient when a nurse tries to call alters out and send others back.