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2008 ; 52
(4
): 727-36
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Erythropoietin, iron depletion, and relative thrombocytosis: a possible
explanation for hemoglobin-survival paradox in hemodialysis
#MMPMID18760517
Streja E
; Kovesdy CP
; Greenland S
; Kopple JD
; McAllister CJ
; Nissenson AR
; Kalantar-Zadeh K
Am J Kidney Dis
2008[Oct]; 52
(4
): 727-36
PMID18760517
show ga
BACKGROUND: High doses of human recombinant erythropoietin (rHuEPO) to achieve
hemoglobin levels greater than 13 g/dL in patients with chronic kidney disease
appear to be associated with increased mortality. STUDY DESIGN: We conducted
logistic regression and survival analyses in a retrospective cohort of long-term
hemodialysis patients to examine the hypothesis that the induced iron depletion
with resultant relative thrombocytosis may be a possible contributor to the link
between the high rHuEPO dose-associated hemoglobin level of 13 g/dL or greater
and mortality. SETTING & PARTICIPANTS: The national database of a large dialysis
organization (DaVita) with 40,787 long-term hemodialysis patients during July to
December 2001 and their survival up to July 2004 were examined. PREDICTORS:
Hemoglobin level, platelet count, and administered rHuEPO dose during each
calendar quarter. OUTCOMES & OTHER MEASUREMENTS: Case-mix-adjusted 3-year
all-cause mortality and measures of iron stores, including serum ferritin and
iron saturation ratio. RESULTS: Higher platelet count was associated with lower
iron stores and greater prescribed rHuEPO dose. Compared with a hemoglobin level
of 12 to 13 g/dL, a hemoglobin level of 13 g/dL or greater was associated with
increased mortality in the presence of relative thrombocytosis, ie, platelet
count of 300,000/microL or greater (case-mix-adjusted death-rate ratio, 1.21; 95%
confidence limits, 1.02 to 1.44; P = 0.03) as opposed to the absence of relative
thrombocytosis (death-rate ratio, 1.04; 95% confidence limits, 0.98 to 1.08; P =
0.1). A prescribed rHuEPO dose greater than 20,000 U/wk was associated with a
greater likelihood of iron depletion (iron saturation ratio < 20%) and relative
thrombocytosis (case-mix-adjusted odds ratio, 2.53; 95% confidence limits, 2.37
to 2.69; and 1.36; 95% confidence limits, 1.30 to 1.42, respectively; P < 0.001)
and increased mortality during 3 years (death-rate ratio, 1.59; 95% confidence
limits, 1.54 to 1.65; P < 0.001). LIMITATIONS: Our results may incorporate
uncontrolled confounding. Achieved hemoglobin level may have different mortality
predictability than targeted hemoglobin level. CONCLUSIONS: Iron depletion and
associated relative thrombocytosis might contribute to increased mortality when
administering high rHuEPO doses to achieve hemoglobin levels of 13 g/dL or
greater in long-term hemodialysis patients. Randomized trials are needed to test
these observational associations.
|*Iron Deficiencies
[MESH]
|Adult
[MESH]
|Aged
[MESH]
|Anemia, Iron-Deficiency/complications/drug therapy/prevention & control
[MESH]