The staff Registered Nurse (RN) is a professional caregiver who assumes responsibility for a group of patients for a designated time frame and provides care to these patients via the utilization of the nursing process, nursing trends, technology, financial and human resources within the philosophy of the institution. Critical care nurse, CCU RN, intensive care nurse, ICU nurse, ICU nursing, ICU, intensive care, critical care, registered nurse, RN, R.N., nurse, nursing, healthcare, health care, patient care