RT Book, Section A1 Rozenfeld, Ranna A. SR Print(0) ID 1152489233 T1 Anaphylaxis T2 The PICU Handbook YR 2018 FD 2018 PB McGraw-Hill Education PP New York, NY SN 9781259834370 LK accesspediatrics.mhmedical.com/content.aspx?aid=1152489233 RD 2024/04/19 AB Etiology: An acute multisystem response caused by a severe reaction to any antigen, such as a drug, vaccine, food, toxin, plant, or venomClinical Presentation:Systemic vasodilation:HypotensionTachycardiaIncreased capillary permeability:Angioedema – may lead to partial or complete airway obstructionWorsens hypotensionPulmonary vasoconstriction:Decreased pulmonary blood flowIncreased right ventricular afterloadDecreased left ventricular preloadBronchoconstriction/bronchospasmRespiratory distress +/− stridor, wheezing, or bothHistamine release:UrticariaNausea and vomiting