mariovitali
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@Violeta
Patients with chronic liver disease have a tendency to accumulate an excessive amount of iron in their liver parenchyma. Those with alcoholic liver disease, nonalcoholic steatohepatitis or hepatitis C virus infection have a particular tendency toward secondary hemosiderosis.
Patients who have secondary iron overload must be distinguished from those with hered- itary hemochromatosis, in which a primary genetic defect leads to an excessive hepatic and total-body iron load. The level of iron loading is much greater in patients with pri- mary hemochromatosis than in those with secondary hemosiderosis.
As many as 30 percent of patients with liver disease have high serum iron levels, and 10 percent have excessive amounts of iron in their liver tissue.30,31 The reason for the iron excess is not known, but postulated mechanisms include the release of iron from injured hepatocytes and their uptake by Kupffer cells, acute-phase reactions associated with chronic inflammatory states, increased uptake of iron through the gastrointestinal tract, and ineffec
tive erythropoiesis with redistribution of iron from sites of utilization to sites of storage. The most likely mechanisms of liver injury from excess iron are increased generation of free radicals and increased peroxidation of lipids, which, in turn, lead to mitochondrial dysfunction, lysosomal fragility and cell death.
Iron has recently been shown to influence the natural history of hepatitis C virus infec- tion and the response of chronic hepatitis C to treatment. Several studies32,33 in patients with chronic hepatitis C virus infection have found a high iron concentration in the liver to be predictive of failure to respond to inter- feron therapy. Some evidence indicates that phlebotomy improves liver function tests in patients with chronic hepatitis C virus infection.34 Recent studies have also shown an increased response of the hepatitis C virus to interferon combined with phlebotomy, although not all studies are in agreement