|Year : 2015 | Volume
| Issue : 1 | Page : 7-10
Evaluation of mean platelet volume before and after iron deficiency anemia treatment
Suleyman Yuce1, Medine Cumhur Cure2, Erkan Cure1, Sefa Kiztanir3, Tarkan Yazici2
1 Department of Internal Medicine, University of Recep Tayyip Erdogan, Rize, Turkey
2 Department of Biochemistry, University of Recep Tayyip Erdogan, Rize, Turkey
3 Department of Internal Medicine, Yalvac State Hospital, Isparta, Turkey
|Date of Web Publication||29-Nov-2014|
Medine Cumhur Cure
Department of Biochemistry, University of Recep Tayyip Erdogan, School of Medicine, Rize, 53100
Source of Support: None, Conflict of Interest: None
Background: Iron inhibits megakaryopoiesis so iron deficiency anemia (IDA) leads to microthrombosis. Iron therapy ameliorates thrombocytosis. In this study, we investigated whether young, active, and large platelets are released into peripheral blood during iron treatment. Mean platelet volume (MPV) was measured as an indicator for the presence of these platelets. Materials and Methods: A total of 80 patients (10 males and 70 females) with IDA were included in this retrospective study. IDA was defined as ferritin level <50 ng/mL with a transferrin saturation <20% or ferritin <15 ng/mL. Daily ferrous sulfate (270 mg iron II sulfate and 80 mg of elemental iron) was given orally to patients. We evaluated retrospectively the hematologic and biochemical parameters prior to and 1 month after iron treatment. Results: the mean ferritin level of the pretreatment group was 6.5 ± 4.0 ng/mL, MPV was 7.9 ± 1.5 fL, hemoglobin (Hb) was 9.8 ± 1.5 g/dL and the mean cellular volume (MCV) was 71.2 ± 7.2 fL. The mean ferritin level of the posttreatment group was 40.3 ± 15.2 ng/mL, MPV was 8.6 ± 2.0 fL, Hb was 12.5 ± 6.6 g/dL, and MCV was 77.6 ± 5.4 fL. The levels of ferritin (P < 0.001), MPV (P < 0.001), MCV (P < 0.001), and Hb (P < 0.001) were significantly higher in the posttreatment group compared to the pretreatment group. Conclusion: There may be an increase in thrombotic events due to hypercoagulability related to microthrombosis during IDA. Even though thrombosis is corrected during iron treatment, the therapy increases the release of large and active thrombocytes into the peripheral blood.
Keywords: Iron, iron deficiency anemia, mean platelet volume, thrombocytosis, thrombosis
|How to cite this article:|
Yuce S, Cure MC, Cure E, Kiztanir S, Yazici T. Evaluation of mean platelet volume before and after iron deficiency anemia treatment
. Sifa Med J 2015;2:7-10
|How to cite this URL:|
Yuce S, Cure MC, Cure E, Kiztanir S, Yazici T. Evaluation of mean platelet volume before and after iron deficiency anemia treatment
. Sifa Med J [serial online] 2015 [cited 2019 Jul 23];2:7-10. Available from: http://www.imjsu.org/text.asp?2015/2/1/7/145794
| Introduction|| |
Iron is an essential trace element presents in a number of molecular systems and it is increasingly recognized as an important cofactor for a variety of cell systems.  It is the basic element for the production of new red blood cells (RBC). If it is not used in erythropoiesis it is stored as ferritin or hemosiderin.  Serum ferritin levels are closely correlated with total body iron stores.  Iron deficiency anemia (IDA) occurs due to increased body requirements, insufficient iron supply (depending on dietary iron intake and duodenal absorption) and blood losses.  It has been estimated that 30% of the world population suffers from IDA and most of them live in the developing countries.  While iron deficiency leads to anemia its excess leads to both deposition of iron in the tissues as hemosiderosis and cellular damage by oxygen radicals as a result of the combination of free iron with peroxides radicals.  Excess iron in the body may be dependent on the HFE gene on chromosome 6 as well as it may occur with unnecessary or long-term treatment of iron. 
The mean platelet volume (MPV) reflects thrombocyte size. It is an important marker of thrombocyte function. MPV follow-up can be performed by using a low-cost routine hematologic test. When compared to small thrombocytes large ones have more granules and a higher thromboxane A 2 level. They aggregate more rapidly with collagen and express more glycoprotein Ib and IIb/IIIa receptors. , Thrombocytes secrete many important substances such as coagulation, inflammation, thrombosis, and atherosclerosis mediators that increase the risk of occlusive vascular disease.  Previous studies demonstrated MPV to be associated with both arterial and venous diseases. ,
Iron not only induces erythropoiesis but also suppresses megakaryopoiesis.  Small thrombocytes lead to thrombocytosis that occurs in IDA due to not be suppressed megakaryopoiesis.  During iron treatment bone marrow production of megakaryocytes can be induced leading to young and large platelets being released into peripheral blood. While iron therapy corrects thrombocytosis and normalizes peripheral thrombocytes it may also lead to release of large thrombocytes into peripheral blood. Iron therapy should be given in caution to patients with thrombosis, heart disease, ischemic stroke. So in this study, we aimed to investigate whether peroral iron treatment is associated with high MPV.
| Materials and Methods|| |
This retrospective study was carried out in the Internal Medicine Department of the Recep Tayyip Erdogan University School of Medicine. A total of 80 patients diagnosed with iron deficiency anemia (70 females and 10 males) were included in this study. The mean patient's age was 39.8 ± 15.2 years. Patients with ferritin <50 ng/mL and transferrin saturation <20% or ferritin <15 ng/L were considered iron deficient. , Peroral ferrous sulfate (270 mg iron II sulfate, 80 mg of elemental iron) was given daily to patients. The patient files were retrospectively analyzed after 1 month of treatment. Exclusion criteria were as follows: folate deficiency, vitamin B 12 deficiency anemia, or chronic diseases (such as thalassemia, malignancy, active gastrointestinal bleeding, diabetes, hypertension, hyperlipidemia, coronary artery disease, chronic obstructive pulmonary disease, chronic renal failure, and thyroid diseases). Patients were nonsmokers and did not consume alcohol or use drugs (especially drugs that affect iron metabolism).
Hematologic tests were performed using the Abbott Cell Dyn Ruby analyzer (Abbott Diagnostics, Abbott Park, IL, USA). The iron levels, unsaturated iron-binding capacity (UIBC) and biochemical tests were measured by photometric assays using the Abbott Architect C16000 analyzer (Abbott Diagnostics). Ferritin, TSH, and vitamin B 12 tests (for differential diagnosis) were performed by using the chemiluminescent microparticle immunoassay (CMIA) method by the Abbott Architect I 2000 immunology analyzer (Abbott Diagnostics).
This study conformed to the Helsinki Declaration, and was approved by the local ethics committee of the Recep Tayyip Erdogan University School of Medicine, Rize, Turkey.
The results were reported as the means ± SD. The data analysis was performed using the statistical software SPSS for Windows version 13.1(SPSS, Chicago, IL, USA). All results were analyzed by applying the Kolmogorov-Smirnov test for determining the normal and non-normal data distribution. The differences in all parameters between the pre- and post-treatment groups were analyzed using the paired t-test for those with a normal distribution and Wilcoxon tests for those with a non-normal distribution. The relationships among the variables were analyzed with Pearson's correlation test. Differences were considered significant at P < 0.05.
| Results|| |
The mean white blood cell count (WBC) of the pretreatment group was 6.3 ± 1.7 ΄ 10 9 /L, Hb was 9.8 ± 1.5 g/dL, the mean cell volume (MCV) was 71.2 ± 7.2 fL, platelet count (Plt) was 308 ± 98 ΄ 10 9 /L, MPV was 7.9 ± 1.5 fL, ferritin was 6.5 ± 4.0 ng/mL, and iron was 20.4 ± 10.7 μg/dL. The mean WBC of the posttreatment group was 6.4 ± 1.6 Χ 10 9 /L, Hb was 12.5 ± 6.6 g/dL, MCV was 77.6 ± 5.4 fL, Plt was 268 ± 80 ΄ 10 9 /L, MPV was 8.6 ± 2.0 fL, ferritin was 40.3 ± 15.2 ng/mL and iron was 45 ± 9.4 μg/dL. The Hb (P < 0.001), MCV (P < 0.001), MPV (P < 0.001) and ferritin (P < 0.001) were significantly higher in the post-treatment group. The plt (P < 0.001) was significantly lower in the post-treatment group. The demographic characteristics and results of the hematological and biochemical tests are shown in [Table 1].
|Table 1: The main characteristics and laboratory parameters for the two groups|
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Correlation analysis indicated positive correlations between MCV (r = 0.169, P = 0.032) and ferritin (r = 0.156, P = 0.015) with MPV. Correlation analysis indicated positive correlations between MCV (r = 0.265, P = 0.003), and Hb (r = 0.143, P = 0.020) with ferritin.
| Discussion|| |
Our data have shown elevation of ferritin, Hb, MCV, and MPV levels following peroral iron treatment in patients with IDA. The increased MPV was correlated with ferritin and MCV. The current study has shown MPV to be increased in patients with IDA taking iron. Iron deficiency is the primary cause of anemia and affects nearly one-quarter of the world population. IDA generally occurs in children due to decreased dietary intake and in young women due to menstruation. Gastrointestinal tract blood loss is the most common cause of IDA occurring in 2-5% of adult males and postmenopausal females in the developed world.  In humans intracellular iron is stored as ferritin making this protein important in maintaining iron levels. Hematologic parameters of IDA include: low serum ferritin, low iron, increased total iron binding capacity, increased erythrocytes, protoporphyrin, and increased transferrin binding receptor levels. , Serum ferritin levels below 12-15 mg/L indicate IDA. In patients with chronic diseases acute phase reactant ferritin <50 ng/L indicates IDA. ,
In our study, posttreatment thrombocyte levels were lower than pretreatment levels. However, MPV increased following the treatment indicating the release of young, large, and active thrombocytes into the peripheral blood stream. In a previous study thrombocytes and MPV levels were compared before and after 8 weeks of oral ferrous sulfate (4 mg/kg/day) in children.  Thrombocytes decreased significantly following treatment while MPV increased. Authors reported that thrombocytes increased to normal size after iron therapy. Iron is also an important cofactor for thrombocyte enzyme systems. Iron inhibits thrombocytosis. In patients with IDA thrombocytosis is uninhibited due to low iron and increased IL-6 levels. , These thrombocytes are smaller than normal. Microthrombocytosis is associated with increased megakaryocytes with less ploidy than normal, an increased megakaryocyte mass, and an increased platelet production rate.  In contrast thrombocytopenia of unknown etiology has been reported in patients with severe IDA.  Iron treatment may improve thrombocytopenia quickly even though it inhibits megakaryopoiesis. It may increase megakaryopoiesis by stimulating oxidative stress.
In the current study MPV was found to be increased even though thrombocytes number decreased following iron therapy. Giles reported that although platelet distribution is normal in pregnancy, patients with preeclampsia and uncomplicated hypertension in late pregnancy tended to have lower platelet counts and larger platelets.  Iron treatment may lead to the release of active and large thrombocytes into peripheral blood. Iron stimulation of oxidative stress may lead to increased MPV. Iron inhibition of megakaryocytes may lead to slower and normal or exaggerated maturation. This may lead to the release of active and large thrombocytes.
IDA can cause hypercoagulability, reactive thrombocytosis, anemia, and increased viscosity due to red cell deformability related to microcytosis. It has been reported that thrombosis risk is increased in IDA patients.  Previous studies have shown that elevation of collagen and ADP during IDA may lead to increased thrombocyte aggregation.  However, other studies have not found increased collagen and ADP during IDA. , Another study showed that female patients with IDA have normal collagen and ADP levels, but increased menstrual bleeding due to arachidonic-acid-induced platelet dysfunction;  iron therapy decreased bleeding in these patients.  Alternatively, iron overload may lead to increased platelet aggregation. Excess iron may increase oxidative stress which increases platelet aggregation.  In addition to increasing MPV oxidative stress increases proinflammatory cytokines like tumor necrosis factor alpha (TNF-α) and interlukin-6 (IL6) that stimulate megakaryopoiesis leading to release of active and large thrombocytes.  These thrombocytes secrete aggregation-promoting substances such as fibrinogen, collagen, ADP, calcium, and serotonin. Elevated MPV indicates an increase in active and large thrombocytes.  Elevated MPV is associated with myocardial infarction, stroke, and arterial and venous thromboembolism.  A previous study reported that iron therapy increases fibrin leading to cardiovascular disease.  Fibrin is formed from fibrinogen which is released from thrombocytes. Iron therapy leads indirectly to thrombosis and our results indicate increased MPV levels during iron treatment. These findings show that the increased thrombosis risk is related to iron therapy rather than IDA itself. Further studies are needed on this subject. It is known that oxidative stress is increased leading to elevated megakaryopoiesis; iron inhibits megakaryopoiesis which is increased during IDA. However, the release of microthrombocytes into peripheral blood prevents the increase in MPV. Previous studies have shown collagen and ADP to be similar to control groups during IDA. Therefore, thrombosis events with IDA may be related to hyperviscosity.
Limitations of the study
This study included a relatively small sample size with a 1-month follow-up period. During long treatment durations increasing exposure to iron may increase MPV. MPV may be higher with a greater oral dosage or intravenous iron treatment. There are no adequate studies in the literature regarding the relationship between iron treatment and MPV. So there is a need for further studies on this subject.
| Conclusion|| |
In IDA, there is an increased risk of thrombotic events due to microthrombosis-related hypercoagulability. Although thrombocytosis is improved during iron treatment, the release of large and active thrombocytes into peripheral blood may cause arterial and venous thromboembolism.
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