Related Experiment Videos
Classification and diagnosis of iron overload
1Istituto di Scienze Biomediche, Azienda Ospedaliera S. Gerardo, Monza, Italy. alberto.piperno@unimi.it
Insights
Iron overload, a condition leading to organ damage and mortality, requires updated diagnostic criteria. This review redefines these criteria based on iron access, accumulation sites, and causes, incorporating genetic factors like HFE mutations.
Area of Science:
- Hematology
- Genetics
- Internal Medicine
Background:
- Iron overload disorders can cause significant organ damage and increase mortality.
- Recent discoveries in iron overload conditions and hereditary hemochromatosis genetics necessitate a review of diagnostic standards.
Purpose of the Study:
- To review and redefine the diagnostic criteria for iron overload disorders.
- To incorporate new understandings of genetic defects and associated conditions.
Main Methods:
- Comprehensive literature review of articles from Science Citation Index and Medline.
- Author's extensive experience in iron overload diseases, contributing to cited research.
Main Results:
- Iron overload classification based on iron entry route, tissue accumulation site, and etiology (primary vs. secondary).
- Diagnostic indicators include clinical data, transferrin saturation, and ferritin levels, but some conditions mimic overload.
- Liver biopsy and HFE gene mutation analysis (C282Y, H63D) are crucial for accurate diagnosis.
Conclusions:
- Accurate classification and diagnosis of iron overload are essential for managing organ damage and prognosis.
- Distinguishing true iron overload from other hyperferritinemic conditions is critical.
- Genetic testing and liver biopsy provide definitive diagnostic insights.
Background And Objective:
Iron overload is the result of many disorders and could lead to the development of organ damage and increased mortality. The recent description of new conditions associated with iron overload and the identification of the genetic defect of hereditary hemochromatosis prompted us to review this subject and to redefine the diagnostic criteria of iron overload disorders.
Evidence And Information Sources:
The material examined in the present review includes articles published in the Journals covered by the Science Citation Index and Medline. The author has been working in the field of iron overload diseases for several years and has contributed ten of the papers cited in the references.
State Of The Art And Perspectives:
Iron overload can be classified on the basis of different criteria: route of access of iron within the organism, predominant tissue site of iron accumulation and cause of the overload. Excess iron can gain access by the enteral route, the parenteral route, and placental route during fetal life. The different distribution of iron within parenchymal or reticuloendothelial storage areas indicates different pathogenetic mechanisms of iron accumulation and has relevant implications in terms of organ damage and prognosis of the patients. Iron overload may be either primary, resulting from a deregulation of intestinal iron absorption as in hemochromatosis or secondary to other congenital or acquired conditions. Diagnosis of iron overload can be suspected on the basis of clinical data, high transferrin saturation and/or serum ferritin values. However, several hyperferritinemic conditions are not related to iron overload, but may imply severe disorders (inflammations, neoplasia) or a deregulation of ferritin synthesis (hereditary hyperferritinemia-cataract syndrome), and iron overload secondary to aceruloplasminemia, and the recently described dysmetabolic-associated liver iron overload syndrome, are characterized by low or normal transferrin saturation levels. Liver biopsy is still very useful in the diagnostic approach to iron overload disorders, by defining the amount and the distribution of iron within the liver. The analysis of HFE gene mutations (C282Y and H63D) is a simple and strong tool in the diagnostic work out of iron overload conditions.