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PubMed2005

Polycythemia vera: plethora, from prehistory to present.

The term polycythemia (literally, "many blood cell disease") and its obsolete synonym, erythremia, postdate Robert Hooke's 17th century discovery of cells, but the concept of a clinically problematic excess of blood was formulated in antiquity. Observation of plethoric patients by clinicians of the Hippocratic school informed the classical humoral framework that dominated theoretical constructs of human disease for more than a thousand years. In the golden era of disease description at the end of the 19th century, the idiopathic entity polycythemia rubra vera (PRV) was first described and distinguished from secondary and relative polycythemia (red cell excess not caused by a primary bone marrow disorder, and artifactual red cell excess caused by plasma volume contraction, respectively). This review traces some of the principal events in the history of polycythemia vera (PV) as a discrete clinical entity.

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PubMedDate not supplied

[A "plethora", minor and transient, as an immediate cause of a cerebrovascular accident].

Even if the well-known predisposing factors play an essential role in the realization of cerebrovascular accidents, in these last years the possible importance of the hemoreologic parameters is still a topic under discussion. The authors found a significant increase of the considered hemoreologic parameters (HT, Hb, RBC) in the patients hospitalized for cerebrovascular accidents compared to controls, without differences for gender, even if this increase remained into the limits of normal range. Conversely, no significant differences were found concerning the considered metabolic parameters.

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