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2. Does EDTA chelation therapy have side effects?
When used as approved by the FDA (at the appropriate dose and infusion rate) for treatment of heavy metal poisoning, chelation with EDTA has
a low occurrence of side effects. The most common side effect is a burning sensation experienced at the site where the
is delivered into the veins.
Rare side effects can include fever, hypotension (a sudden drop in blood pressure), hypocalcemia (abnormally low calcium levels in the blood), headache,
nausea, vomiting, and bone marrow depression (meaning that blood cell counts fall). Injury to the kidneys has been reported with EDTA chelation therapy,
but it is rare. Other serious side effects can occur if
is not administered by a trained health professional.
3. How might EDTA chelation therapy work to clear blocked arteries?
Several theories have been suggested by those who recommend this form of treatment. One theory suggests that
chelation might work by directly
removing calcium found in fatty plaques that block the arteries, causing the plaques to break up. Another is that the process of chelation may stimulate the
release of a hormone that in turn causes calcium to be removed from the plaques or causes a lowering of cholesterol levels. A third theory is that
therapy may work by reducing the damaging effects of oxygen ions (oxidative stress) on the walls of the blood vessels. Reducing oxidative stress could reduce
inflammation in the arteries and improve blood vessel function. None of these theories has been well tested in scientific studies.
4. Is there evidence that EDTA chelation therapy works for CAD?
There is a lack of adequate prior research to verify
chelation therapy's safety and effectiveness for CAD. The bulk of the evidence
chelation therapy is in the form of case reports and case series. Some patients who have undergone chelation therapy and the
physicians who prescribed it claim improvement in CAD. In addition, there are approximately 12 published descriptive studies and 5 randomized controlled
clinical trials regarding the use of EDTA chelation for CAD. Although each descriptive study did report a reduction in angina, they were uncontrolled clinical
observations or retrospective data, typically with a small number of participants. Of the five clinical trials in which patients were randomly selected to
receive chelation therapy or a placebo (a dummy solution), the most rigorous way of assessing a new treatment, three trials involved so few people that only
a dramatic improvement could have been detected. Studies need a larger number of participants to detect more mild benefits of a treatment. The fourth study
was never published in final form, so its conclusions are uncertain. Finally, the fifth study reported that EDTA chelation was associated with an improvement
in ability to exercise, but it had only 10 participants.
5. How frequently is EDTA chelation therapy used?
It is estimated by the American College for Advancement in Medicine, a professional association that supports the use of chelation therapy, that
more than 800,000 visits for chelation therapy were made in the United States in 1997 alone.
NCCAM, National Institutes of Health
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Bethesda, Maryland 20892 USA
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