Official Twitter of the American Association of Critical-Care Nurses: A Community of Exceptional Nurses. Tag us @AACNme #AACN. https://t.co/sbJET277OU Patients and their families rely on nurses at the most vulnerable times of their lives. Acute and critical care nurses rely on AACN for expert knowledge and the influence to fulfill their promise to patients and their families. AACN drives excellence in acute and critical care for nurses, patients and families.