TY - CHAP M1 - Book, Section TI - Immune Thrombocytopenia A1 - Hardin, J. Matthew A2 - Knoop, Kevin J. A2 - Stack, Lawrence B. A2 - Storrow, Alan B. A2 - Thurman, R. Jason Y1 - 2021 N1 - T2 - The Atlas of Emergency Medicine, 5e AB - Immune thrombocytopenia (formerly idiopathic thrombocytopenic purpura [ITP]) occurs because of platelet injury and destruction. Pinpoint, red, nonblanching petechiae or nonpalpable purpura and ecchymoses are found on the skin and mucous membranes, either spontaneously (platelets < 10,000/mm3) or at the site of minimal trauma (platelets < 40,000/mm3). Petechiae are commonly found on dependent areas. Gingival bleeding, melena, hematochezia, menorrhagia, and severe intracranial hemorrhages may also occur. The newly diagnosed form affects children (peak incidence in 2- to 4-year-olds, equal gender distribution) after a viral illness or vaccination and completely resolves in 3 months. The chronic form occurs most often in adults, with women outnumbering men and a prolonged course of thrombocytopenia. SN - PB - McGraw-Hill CY - New York, NY Y2 - 2024/03/29 UR - accessmedicine.mhmedical.com/content.aspx?aid=1181043799 ER -