How Long Should Routine EEG Be Recorded to Get Relevant Information?

Objective: The optimal duration of routine EEG (rEEG) has not been determined on a clinical basis. This study aims to determine the time required to obtain relevant information during rEEG with respect to the clinical request.

Method: All rEEGs performed over 3 months in unselected patients older than 14 years in an academic hospital were analyzed retrospectively.

A human cell line isolated from fetal kidney produces an apparently erythroid-specific stimulating activity.

The burst formation from human and murine burst forming unit-erythroid (BFU-E) requires the presence of erythropoietin (Epo) in semi-solid cultures of bone marrow cells. A number of haematopoietic factors are described that increase the burst number: interleukin 3 (IL-3), stem cell factor (SCF), granulocyte-macrophage colony-stimulating factor (GM-CSF), IL-9, IL-11, insulin-like growth factor I, and erythroid potentiating activity (EPA). The authors now show that another activity present in medium conditioned from adult or fetal human kidney cells specifically stimulates the proliferation of BFU-E.