Cytopenia associated with iron deficiency anemia and iron therapy: a report of two cases / Demir eksikligi anemisi ve demir tedavisi ile iliskili sitopeni: iki olgu sunumu.
Iron deficiency anemia
|Publication:||Name: Turkish Journal of Hematology Publisher: Aves Yayincilik Audience: Academic Format: Magazine/Journal Subject: Health Copyright: COPYRIGHT 2011 Aves Yayincilik ISSN: 1300-7777|
|Issue:||Date: Sept, 2011 Source Volume: 28 Source Issue: 3|
To the editor,
Thrombocytopenia before and after iron therapy has been reported in children with severe iron deficiency anemia (IDA), but the association and mechanism of action are not well established (1-6). Herein we present 2 children with IDA that had low platelet and leukocyte counts at presentation (n=1) and following oral iron therapy (n=1). Written informed consent was obtained from the patient.
A 7-year-old boy with pica presented with a diagnosis of leukemia. He did not have hepatosplenomegaly, lymphadenopathy, or infection. Laboratory results were as follows: hemoglobin (F1b): 6.9 g/dL; mean corpuscular volume (MCV): 66 fL; red cell distribution width (RDW): 20.3%. Iron studies results were consistent with iron deficiency, as follows: serum iron: 13 [micro]g/dL; total iron binding capacity: 416 [micro]g/dL; ferritin level: 10 ng/mL. The patient's white blood cell (WBC) count was 2.9 x [10.sup.3]/[micro]L (1.5 x [10.sup.3]/[micro]L neutrophils) and platelet count was 28 x [10.sup.3]/[micro]L . Bone marrow aspiration showed a normal number of megakaryocytes, low-level stored iron, and no blasts. The patient was diagnosed as IDA. On d 5 of iron treatment the patient's findings were as follows: Hb: 7.4 g/dL; MCV: 68 fL, RDW: 25.7%; WBC: 5.6 x [10.sup.3]/[micro]L; platelet count: 430 x [10.sup.3]/[micro]L .
A 2-year-old boy presented with fatigue, pallor, diminished appetite, and irritability. Laboratory results were as follows: Hb: 5.3 g/dL; MCV: 54.5 fL; RDW: 32.5%; WBC: 8.4 x [10.sup.3]/[micro]L; and platelet count: 769 x [10.sup.3]/[micro]L . Iron study results were as follows: serum iron: 7 [micro]g/dL; total iron binding capacity: 423 [micro]g/dL; ferritin level: 1.8 ng/mL. On d 6 of iron treatment there was a sudden decrease in his platelet count (31 x [10.sup.3]/[micro]L AL), but he had no signs of infection and viral serology was negative. Bone marrow aspiration showed a normal number of megakaryo-cytes, low-level stored iron, and no blasts. After iron therapy his platelet count was 194 x [10.sup.3]/[micro]L on d 10, and 382 x [10.sup.3]/[micro]L on d 12.
Thrombocytopenia is an uncommon manifestation of iron deficiency (2% of IDA patients) (7). Perlman et al. reported 6 children with IDA and thrombocytopenia with a mean platelet count of 64 x [10.sup.9]/L. After initiation of oral iron therapy the patients had rapid increases in their platelet counts. The researchers speculated that iron-dependent processes critical to thrombopoiesis were altered (3).
The mechanism of thrombocytopenia in iron deficiency might be an early response to direct stimulation of the EPO receptor on megakaryocytes or shunting into the erythroid precursors pathway, leading to decreased platelet formation (8). Leukopenia may also occur in patients with IDA (3), though the exact mechanism is unclear; alteration in the activity of iron-dependent enzymes in leucopoiesis may be the cause. Animal experiments and in vitro studies have demonstrated that administration of erythropoietin down-regulated neutrophil production (9).
In conclusion, the 2 presented cases had a very common disease, but uncommon findings. IDA and iron therapy may be associated with decreased platelet and leucocyte counts.
Conflict of interest statement
The authors of this paper have no conflicts of interest, including specific financial interests, relationships, and/or affiliations relevant to the subject matter or materials included.
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Nihal Ozdemir, Tiraje Celkan, Rejin Kebudi, Meltem Bor, Inci Yildiz
Department of Pediatric Hematology, Cerrahpaw Faculty of Medicine, Istanbul University, Istanbul, Turkey
Address for Correspondence: Prof. Tiraje Celkan, Department of Pediatric Hematology, Cerrahpaa Faculty of Medicine, Istanbul University, Istanbul, Turkey Phone: +90 212 414 30 00/2 1956 E-mail: email@example.com
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