Serum erythropoietin and hemoglobin affinity for oxygen in patients phlebotomized for polycythemia vera

Advances in Experimental Medicine and Biology
R A CohenS Ebbe

Abstract

Serum erythropoietin (Ep) was measured by radioimmunoassay before and 24 hours after therapeutic phlebotomies in patients with polycythemia vera (PV) and in normal subjects before and after phlebotomies of comparable volumes. In addition the in vivo oxygen affinity of hemoglobin (P50) was calculated, and red cell indices and 2,3 DPG values were measured. Paired t tests determined whether the differences between pre- and post--phlebotomy values were statistically significant. Blood hemoglobin (Hb) levels declined after phlebotomy, and generally continued to be at or above normal levels. Serum Ep increased after phlebotomy in both groups of subjects. The in vivo P50 value for patients with PV (29.4 +/- 0.4 mmHg) was significantly (p less than 0.005) greater than the normal value (27.2 +/- 0.5). Seven of the PV patients (5 males, 2 females) were restudied. Their Hb and hematocrit values were either normal or slightly higher than normal. The MCV for 4 males and 1 female was below normal. The MCHC was slightly lower than normal and reticulocytosis was not present. The male PV patients had greater than normal 2,3 DPG values and most had right-shifted P50 values. There was no correlation between 2,3 DPG values and P50 values. The fema...Continue Reading

Citations

Nov 1, 2000·The Veterinary Record·S ComazziF Agnes
Mar 18, 2004·Scandinavian Journal of Clinical and Laboratory Investigation·P JohanssonB Andréasson

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