Chapter 26

Hemolytic Uremic Syndrome

Asaf Lebel

Asaf Lebel

Division of Nephrology and Cell Biology Program, Research Institute, The Hospital for Sick Children, Toronto, ON, Canada

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Amrit Kirpalani

Amrit Kirpalani

Division of Nephrology and Cell Biology Program, Research Institute, The Hospital for Sick Children, Toronto, ON, Canada

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Christoph Licht

Christoph Licht

Division of Nephrology and Cell Biology Program, Research Institute, The Hospital for Sick Children, Toronto, ON, Canada

Department of Paediatrics, University of Toronto, Toronto, ON, Canada

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First published: 18 November 2022

Summary

This chapter focuses on the epidemiology, pathophysiology, clinical manifestations, diagnosis, prognosis, and treatment of two entities of the Thrombotic microangiopathy (TMA) spectrum: Shiga toxin-producing Escherichia coli-associated hemolytic uremic syndrome (STEC-HUS) and complement-mediated TMA. STEC-HUS is more frequent in children than in adults, with median age around two years, although adults have more severe disease with higher mortality. The common pathologic basis of all TMA is injury to the vascular endothelium with subsequent microvascular thrombosis, which leads to consumptive thrombocytopenia, microangiopathichemolytic anemia, and kidney and other organs injury. The clinical symptoms of TMA reflect anemia, thrombocytopenia, and renal or other organ involvement, and include pallor, fatigue, shortness of breath, oliguria, and edema. HUS is an entity under the umbrella of TMA. The most common cause, STEC-HUS, has long been considered as independent of the rest of this spectrum of diseases as it has a defined trigger and known secondary cause of microangiopathy.

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