Critical Care Nursing is The nursing specialty that deals specifically with human responses to life-threatening problems.The scope of Critical Care Nursing practice is a dynamic process with 3 components:critically ill patients, critical care environment and critical care nurses.the critical care nurse is a registered practitioner who enhances the delivery of comprehensive patient centered care, for acutely ill patients who require complex interventions in a highly technical environment, bringing to the patient care team a unique combination of knowledge and skills