title: Hemostasis and platelet aggregation in purpuric pigmented angiodermatitis eruptions.
abstract: Ten patients with chronic purpuric and pigmented angiodermatitis in the extremities and two patients with acute and disseminated eczematoid-like purpura angiodermatitis were studied with current hemostasis parameters: (1) platelet aggregation, (2) platelet circulating aggregates, (3) clotting factor measurements and high molecular weight kininogen (HMWK) in their coagulation fraction. The results showed: (1) reactional thrombocytosis with morphologic changes; (2) increased levels of platelet circulating aggregates; (3) increased response of platelet aggregation to different agonists, especially at very low doses, and also when we used washed platelets resuspended in normal plasma; (4) delayed activation of the contact system; (5) decrease of the activity of the fibrinolysis activators; and (6) diminished function activity of the HMWK coagulation fraction. As a physiopathogenic hypothesis in these patients, there is a cutaneous pathology that could be entailed to these hematologic alterations of the platelet-HMWK-endothelial cells-kinins-coagulation-fibrinolysis system.
authors.affiliation: Department of Dermatology, Hospital de Clinicas Dr. Manuel Quintela, Montevideo, Uruguay.
authors.forename: R
authors.initials: R
authors.lastname: Vignale
authors.forename: M G
authors.initials: MG
authors.lastname: Rizzo
mesh_terms: D000328:Adult; D001779:Blood Coagulation Factors / Q000032:analysis; D001780:Blood Coagulation Tests; D005260:Female; D006487:Hemostasis / Q000502:physiology*; D006801:Humans; D007704:Kininogens / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D010974:Platelet Aggregation / Q000502:physiology*; D010976:Platelet Count; D011693:Purpura / Q000097:blood*
chemical_list: D001779:Blood Coagulation Factors; D007704:Kininogens