2023, Number 4
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Acta Pediatr Mex 2023; 44 (4)
Thrombotic microangiopathies: thrombotic thrombocytopenic purpura and hemolytic uremic syndrome. A review beyond the clinical spectrum of the disease
Saavedra VME, Martínez-Sánchez LM, Vergara YD, Arrieta SJD
Language: Spanish
References: 46
Page: 312-322
PDF size: 236.20 Kb.
ABSTRACT
Thrombotic microangiopathy (TMA) is related to a histological lesion in arterioles
and capillaries, characterized by thickening and inflammation of the vascular wall,
detachment of endothelial cells, enlargement of the subendothelial space with accumulation
of proteins and cell lysis material, and the presence of platelet thrombi that
occlude the vascular lumen. There are two clinical entities with primary thrombotic
microangiopathy lesions: thrombotic thrombocytopenic purpura and hemolytic
uremic syndrome.
Thrombotic thrombocytopenic purpura is related to a deficit or dysfunction of disintegrin
and metalloproteinase activity, which splits the bond of von Willebrand factor, a protein
involved in the clotting process. Clinically it is characterized by microangiopathic
hemolytic anemia, thrombocytopenia, and increased serum lactate dehydrogenase. On
contrast, the hemolytic uremic syndrome is defined by microangiopathic hemolytic
anemia, thrombocytopenia, and acute kidney injury, and can be classified as typical
and atypical. The typical hemolytic uremic syndrome is associated with the prodrome of
diarrhea after infection with Shiga toxin-producing Escherichia coli, while atypical HUS
is associated with abnormalities in the alternative complement pathway, Streptococcus
pneumoniae infections, systemic lupus erythematosus, disorders of the cobalamin C
metabolism, among others.
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