In clinical yesterday, Inaldys left the floor and did not properly sign out to anyone.  The RN caring for the patient was not informed and the student covering the patient was not given a proper report.  Indalys left a fresh post cardiac cath patient on frequent vitals, groin checks and pulse checks. No one was aware they were to care for the patient. Ranae Lewis and I cared for the patient until I told Mufid Muhommad what he needed to do to care for the patient.  When Inaldys came back up to the floor, I explained to her why this was inappropriate and that her actions could have resulted in dire consequences for the patient.