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• W2021011593 abstract "Studies of space-flight anemia have uncovered a physiologic process, neocytolysis, by which young red blood cells are selectively hemolyzed, allowing rapid adaptation when red cell mass is excessive for a new environment.1) To confirm that neocytolysis occurs in another situation of acute plethora-when high-altitude dwellers with polycythemia descend to sea level; and 2) to clarify the role of erythropoietin suppression.Prospective observational and interventional study.Cerro de Pasco (4380 m) and Lima (sea level), Peru.Nine volunteers with polycythemia.Volunteers were transported to sea level; three received low-dose erythropoietin.Changes in red cell mass, hematocrit, hemoglobin concentration, reticulocyte count, ferritin level, serum erythropoietin, and enrichment of administered(13)C in heme.In six participants, red cell mass decreased by 7% to 10% within a few days of descent; this decrease was mirrored by a rapid increase in serum ferritin level. Reticulocyte production did not decrease, a finding that establishes a hemolytic mechanism.(13)C changes in circulating heme were consistent with hemolysis of young cells. Erythropoietin was suppressed, and administration of exogenous erythropoietin prevented the changes in red cell mass, serum ferritin level, and(13)C-heme.Neocytolysis and the role of erythropoietin are confirmed in persons with polycythemia who descend from high altitude. This may have implications that extend beyond space and altitude medicine to renal disease and other situations of erythropoietin suppression, hemolysis, and polycythemia." @default.
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• W2021011593 date "2001-04-17" @default.
• W2021011593 modified "2023-10-02" @default.
• W2021011593 title "Neocytolysis on Descent from Altitude: A Newly Recognized Mechanism for the Control of Red Cell Mass" @default.
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• W2021011593 doi "https://doi.org/10.7326/0003-4819-134-8-200104170-00010" @default.
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