| anaphylactoid purpura n. 1. See allergic purpura. 2. See Henoch-Schonlein purpura. |
anaphylactoid purpura.
purpura (pur´pyoor
),n an extravasation of blood into the tissues, resulting in blue to black lesions of the skin or mucosa (petechiae and ecchymoses).
)
Purpura.
purpura, allergic,
n (anaphylactoid purpura) a thrombocytopenic or nonthrombocytopenic purpura related to an allergic reaction. Manifestations include the common symptoms of allergy.
purpura, anaphylactoid
n See purpura, allergic.
purpura, essential,
n See purpura, thrombocytopenic, idiopathic.
purpura hemorrhagica
n See purpura, thrombocytopenic and purpura, thrombocytopenic, idiopathic.
purpura, idiopathic thrombocytopenic,
n (essential purpura, land scurvy, primary purpura, purpura hemorrhagica) a type of unknown cause.
purpura, nonthrombocytopenic,
n a type related to increased capillary permeability. Included are allergic purpuras and those resulting from vitamin C deficiency, bacterial toxins (scarlet fever, typhoid), drug intoxications, and metabolic toxins (nephritis, liver disease).
purpura, primary,
n See purpura, thrombocytopenic, idiopathic.
purpura, secondary,
n See purpura, thrombocytopenic, symptomatic.
purpura, symptomatic thrombocytopenic,
n (secondary purpura) a type resulting from the effects of chemical, physical, vegetable, or animal agents or infections or related blood disorders.
purpura, thrombocytopathic
n a type associated with qualitative abnormalities of the platelets.
purpura, thrombocytopenic
n (essential thrombopenia, pseudohemophilia, hemorrhagica, Werlhof's disease) a type characterized by severe ecchymoses and petechiae associated with marked reduction in the numbers of blood platelets. There is prolonged bleeding time and poor clot retraction, but the coagulation and prothrombin times are normal. Hemorrhage may occur spontaneously from any area of the oral mucosa. This disease may be acute and fatal, whereas in other instances it may run a chronic course with intermittent attacks.
purpura, thrombotic thrombocytopenic,
n a febrile disease of unknown cause characterized by hemolytic anemia, neurologic symptoms, hemorrhage into the skin and mucous membranes, icterus, hepatosplenomegaly, low platelet count, and platelet thrombi occluding capillaries and arterioles.
anaphylactoid
resembling anaphylaxis, but not involving an immunological mechanism.
anaphylactoid purpura
see anaphylactoid purpura.
purpura
a hemorrhagic disease characterized by extravasation of blood into the tissues, under the skin and through the mucous membranes, and producing spontaneous ecchymoses and petechiae on the skin. Similar lesions are produced in many specific diseases, e.g. epizootic hemorrhagic disease of deer, bracken poisoning in cattle, and leptospirosis in calves. In immune-mediated purpura there is a defect in the integrity of the vessel wall due to immunological mechanisms, which may also cause a thrombocytopenia.
anaphylactoid purpura
immune-mediated purpura; see also purpura.
fibrinolytic purpura
purpura associated with increased fibrinolytic activity of the blood.
purpura hemorrhagica
a well-defined disease of horses, occurring sporadically, usually associated with a respiratory tract infection. Clinical signs include cold, subcutaneous, edematous swellings, usually about the head and not always symmetrical, mucosal petechiation and high heart rate; affected horses commonly die within a few days. Nonthrombocytopenic.
neonatal purpura
alloimmune hemolytic anemia of the newborn in pigs is sometimes accompanied by a thrombocytopenic purpura, caused by antiplatelet antibodies. See also alloimmune thrombocytopenia.
nonthrombocytopenic purpura
purpura without any decrease in the platelet count of the blood. In such cases the cause of purpura is either abnormal capillary fragility or a clotting factor deficiency.
thrombocytopenic purpura
purpura associated with a decrease in the number of platelets in the blood. See also immune-mediated thrombocytopenia.
vascular purpura
that caused by loss of vascular integrity or function, as seen in vitamin C deficiency (scurvy), diabetes mellitus and hyperadrenocorticism.
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