Search results
Results from the WOW.Com Content Network
Leukocytosis is a condition in which the white cell count is above the normal range in the blood. [ 1 ] [ 2 ] It is frequently a sign of an inflammatory response , [ 3 ] most commonly the result of infection , but may also occur following certain parasitic infections or bone tumors as well as leukemia .
Leukostasis (also called symptomatic hyperleukocytosis) is a medical emergency most commonly seen in patients with acute myeloid leukemia.It is characterized by an extremely elevated blast cell count and symptoms of decreased tissue perfusion.
Conventionally, a leukocytosis exceeding 50,000 WBC/mm 3 with a significant increase in early neutrophil precursors is referred to as a leukemoid reaction. [2] The peripheral blood smear may show myelocytes, metamyelocytes, promyelocytes, and rarely myeloblasts; however, there is a mixture of early mature neutrophil precursors, in contrast to the immature forms typically seen in acute leukemia.
Leukocytosis is often seen during inflammation induced by infection, where it results in a large increase in the amount of leukocytes in the blood, especially immature cells. Leukocyte numbers usually increase to between 15 000 and 20 000 cells per microliter, but extreme cases can see it approach 100 000 cells per microliter. [ 9 ]
There are four major causes: increase of production in bone marrow, increased release from storage in bone marrow, decreased attachment to veins and arteries, decreased uptake by tissues. [18] Leukocytosis may affect one or more cell lines and can be neutrophilic, eosinophilic, basophilic, monocytosis, or lymphocytosis.
A viral infection can directly cause encephalitis or trigger a cascade ending in autoimmunity, with both mechanisms eventually leading to a rise in CSF lymphocyte concentration. [citation needed] For patients with Herpes simplex virus, more than 90% are found to have lymphocytic pleocytosis of varying levels. [5]
Symptoms: Bleeding, bruising, fatigue, fever, increased risk of infections [2] Usual onset: All ages, [3] most common in 60s and 70s. [4] It is the most common malignant cancer in children, but the cure rates are also higher for them. Causes: Inherited and environmental factors [5] Risk factors
Neutrophilia (also called neutrophil leukocytosis or occasionally neutrocytosis) is leukocytosis of neutrophils, that is, a high number of neutrophils in the blood. [1] Because neutrophils are the main type of granulocytes , mentions of granulocytosis often overlap in meaning with neutrophilia.