Self Harm Patients

Hi!  When pediatric patients are hospitalized post a self-harm event and waiting for transfer to a psych center, what measures are used for those patients at risk for elopement, after de-escalating interventions have been unsuccessful?  What is the procedure for a minor running out of the room, that provides for the safety of the patient and staff?  What role does hospital security play, if any?  Thank you!

[offlabel]

Someone needs to have eyes on the patient, physically present, 24/day, until transferred to psych unit.