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Continuous Manual Exchange Transfusion for Patients with Sickle Cell Disease: An Efficient Method to Avoid Iron Overload
Published on: March 14, 2017
Consequences and management of iron overload in sickle cell disease
John Porter1, Maciej Garbowski
11University College London, London, United Kingdom.
Insights
Iron overload in sickle cell disease (SCD) is linked to blood transfusions, with varying iron loading rates based on transfusion methods. Monitoring and chelation therapy focus on liver iron to prevent complications like cirrhosis.
Area of Science:
- Hematology
- Transfusion Medicine
- Iron Metabolism
Background:
- Sickle cell disease (SCD) patients often develop iron overload due to blood transfusions.
- Unlike other inherited anemias, iron overload in SCD is iatrogenic, directly related to transfusion therapy.
Purpose of the Study:
- To review iron distribution mechanisms and consequences in transfused SCD patients.
- To address challenges in monitoring and treating iron overload in SCD.
- To compare iron overload patterns in SCD with other anemias like thalassemia major.
Main Methods:
- Review of existing literature on iron metabolism and overload in SCD.
- Analysis of transfusion regimens and their impact on iron loading rates.
- Discussion of diagnostic methods for iron overload, including MRI and serum ferritin.
- Evaluation of iron chelation strategies for SCD patients.
Main Results:
- Iron loading rates in SCD vary significantly with transfusion methods, with automated erythrocyte apheresis minimizing iron accumulation.
- Transfused iron distribution in SCD differs from thalassemia major, with less extrahepatic and later distribution, leading to fewer cardiac and endocrine complications.
- Liver iron concentration is a primary target for monitoring and treatment to prevent cirrhosis and hepatocellular carcinoma.
Conclusions:
- Transfusional iron overload in SCD requires tailored monitoring and management strategies.
- Noninvasive MRI techniques are valuable for accurate liver iron concentration assessment, guiding chelation therapy.
- Effective iron chelation is crucial for mitigating long-term complications in transfused SCD patients.
Abstract:
The aims of this review are to highlight the mechanisms and consequences of iron distribution that are most relevant to transfused sickle cell disease (SCD) patients and to address the particular challenges in the monitoring and treatment of iron overload. In contrast to many inherited anemias, in SCD, iron overload does not occur without blood transfusion. The rate of iron loading in SCD depends on the blood transfusion regime: with simple hypertransfusion regimes, rates approximate to thalassemia major, but iron loading can be minimal with automated erythrocyte apheresis. The consequences of transfusional iron overload largely reflect the distribution of storage iron. In SCD, a lower proportion of transfused iron distributes extrahepatically and occurs later than in thalassemia major, so complications of iron overload to the heart and endocrine system are less common. We discuss the mechanisms by which these differences may be mediated. Treatment with iron chelation and monitoring of transfusional iron overload in SCD aim principally at controlling liver iron, thereby reducing the risk of cirrhosis and hepatocellular carcinoma. Monitoring of liver iron concentration pretreatment and in response to chelation can be estimated using serum ferritin, but noninvasive measurement of liver iron concentration using validated and widely available MRI techniques reduces the risk of under- or overtreatment. The optimal use of chelation regimes to achieve these goals is described.
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