HCA Healthcare’s New Hampshire hospitals also include Catholic Medical Center in Manchester, Portsmouth Regional Hospital, Parkland Medical Center in Derry, and freestanding emergency rooms in Seabrook, Dover, and Plaistow. Patient Population Served: The Emergency Department Registered Nurse will demonstrate the knowledge and skills necessary to provide care based on the physical ability, intellectual development, psychosocial, educational and safety needs of the neo-natal, pediatric, adolescent, adult and geriatric patient.