Justice is an ethical provision that refers to fair allocation of resources among all patients in the medical institution. In the case of mass casualty, the nurse may prepare or allocate rooms and services to the patients who will need the most urgent and emergent care available by discharging patients who are ordered for discharge and may already be identified by the physicians to be recuperating. The principle of non-maleficence is an idea of preventing harm or inflicting least possible harm to the patient, such as withdrawal of ineffective medical management and implementing palliative treatment for patients with potentially progressive and terminal conditions. Beneficence is an ethical principle that refers to the act that is good and beneficial to the patient. Autonomy is a principle that promotes patient self-determination by giving due consideration to the patient’s competent decisions concerning his healthcare.