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SQUID biosusceptometry in the measurement of hepatic iron
1Department of Pediatrics, Columbia University College of Physicians and Surgeons, Harkness Pavilion, Room HP570, 180 Fort Washington Avenue, NY 10032, New York, USA. ss125@columbia.edu
Insights
A novel superconducting quantum interference device (SQUID) susceptometer accurately measures liver iron. This non-invasive method offers a safe and effective alternative to liver biopsy for diagnosing systemic iron overload.
Area of Science:
- Biophysics
- Medical Diagnostics
- Hematology
Background:
- Systemic iron overload, caused by conditions like hereditary hemochromatosis, leads to organ damage and potentially fatal complications.
- Excess iron deposition in organs such as the liver, heart, and pancreas can result in cirrhosis, heart disease, and diabetes.
- Currently, liver biopsy is the gold standard for quantifying liver iron, but it is invasive.
Purpose of the Study:
- To evaluate the efficacy of a superconducting quantum interference device (SQUID) susceptometer for non-invasively measuring liver iron concentration.
- To establish magnetic measurements as a reliable alternative to traditional liver biopsy for assessing systemic iron overload.
Main Methods:
- Utilized a superconducting quantum interference device (SQUID) susceptometer to measure the magnetic properties of liver iron.
- Compared magnetic measurements of liver iron with biochemical analyses of liver tissue obtained via biopsy in patients with iron overload.
Main Results:
- Magnetic measurements of liver iron using the SQUID susceptometer were found to be quantitatively equivalent to biochemical determinations from liver biopsy samples.
- The SQUID susceptometer provides a safe, easy, rapid, and comfortable method for assessing liver iron levels.
Conclusions:
- Non-invasive magnetic measurements using a SQUID susceptometer offer a reliable and patient-friendly alternative to liver biopsy for quantifying liver iron.
- This technology facilitates frequent, serial monitoring of iron levels, crucial for managing systemic iron overload and its associated health risks.
Abstract:
Individuals with primary or secondary abnormalities of iron metabolism, such as hereditary hemochromatosis and transfusional iron loading, may develop potentially lethal systemic iron overload. Over time, this excess iron is progressively deposited in the liver, heart, pancreas, and other organs, resulting in cirrhosis, heart disease, diabetes and other disorders. Unless treated, death usually results from cardiac failure. The amount of iron in the liver is the best indicator of the amount of iron in the whole body. At present, the only sure way to measure the amount of iron in the liver is to remove a sample of the liver by biopsy. Iron stored in the liver can be magnetized to a small degree when placed in a magnetic field. The amount of magnetization is measured by our instrument, called a superconducting quantum interference device (SQUID) susceptometer. In patients with iron overload, our previous studies have shown that magnetic measurements of liver iron in patients with iron overload are quantitatively equivalent to biochemical determinations on tissue obtained by biopsy. The safety, ease, rapidity, and comfort of magnetic measurements make frequent, serial studies technically feasible and practically acceptable to patients.