en.wikipedia.org/wiki/Chelation_therapy
6 corrections found
According to protocol, EDTA should not be used in the treatment of children.
This confuses two different drugs. Edetate calcium disodium (calcium EDTA) is an established treatment for pediatric lead poisoning; the dangerous product in these deaths was disodium EDTA.
Full reasoning
This statement is incorrect because calcium disodium EDTA is specifically used in children for severe lead poisoning.
- CDC says that when a child’s blood lead level is 45 µg/dL or higher, clinicians should consult specialists to initiate chelation therapy.
- ATSDR’s lead management guideline says children with blood lead levels above 70 µg/dL or with encephalopathy should receive parenteral therapy with BAL and EDTA.
- The FDA/DailyMed label for edetate calcium disodium states that it is indicated for lead poisoning and lead encephalopathy “in both pediatric populations and adults.”
The important distinction is between edetate calcium disodium (used for lead poisoning) and disodium EDTA / edetate disodium (a different formulation that can cause fatal hypocalcemia if used incorrectly). So the article’s blanket claim that “EDTA should not be used in the treatment of children” is wrong; what should not be used for pediatric chelation is disodium EDTA, not all EDTA formulations.
3 sources
- DailyMed - EDETATE CALCIUM DISODIUM injection
Edetate calcium disodium is indicated for the reduction of blood levels and depot stores of lead in lead poisoning (acute and chronic) and lead encephalopathy, in both pediatric populations and adults.
- Lead | Medical Management Guidelines | Toxic Substance Portal | ATSDR
Children with blood lead levels between 45 and 70 µg/dL should undergo chelation, usually with oral succimer; those with encephalopathy or with blood lead levels in excess of 70 µg/dL should be admitted to the hospital for parenteral therapy with BAL and EDTA.
- Recommended Actions Based on Blood Lead Level | Childhood Lead Poisoning Prevention | CDC
If the patient's BLL is ≥ 45 micrograms per deciliter ... consult ... to initiate ... Chelation therapy.
The patients were divided into two groups, receiving chelation therapy by infusions of disodium EDTA, or receiving normal recommended therapy including statins and aspirin.
This misstates the TACT trial design. TACT compared EDTA infusions with placebo infusions, and both groups also received standard post-heart-attack care.
Full reasoning
This sentence inaccurately describes the comparator arm in the NIH-funded TACT trial.
According to NIH/NCCIH and NHLBI’s BioLINCC study record, TACT was a double-blind, placebo-controlled, 2×2 factorial trial. Patients were randomized to receive intravenous disodium EDTA chelation therapy or a placebo infusion, and separately to receive high-dose vitamins/minerals or placebo pills.
That means the trial was not “chelation therapy versus normal recommended therapy including statins and aspirin.” Standard medical care after myocardial infarction continued in the background for participants; the randomized comparison was EDTA vs placebo, not chelation vs standard therapy.
Misdescribing the study this way could make readers think the control group did not receive placebo infusions or that chelation replaced ordinary cardiac care in the treatment arm, which is not how TACT was designed.
2 sources
- Chelation for Coronary Heart Disease: What You Need To Know | NCCIH
TACT was conducted between 2003 and 2011... They were randomly assigned to receive 40 treatments with EDTA or a placebo, plus either high-dose vitamins and minerals or placebo pills.
- BioLINCC: Trial to Assess Chelation Therapy (TACT)
TACT was a double-blind, placebo-controlled, 2 × 2 factorial trial where patients were randomized to receive either intravenous disodium EDTA chelation therapy or a placebo transfusion, and additionally a high dose oral vitamin and mineral regimen or an oral placebo.
DMSA quickly replaced both BAL and EDTA as the primary treatment for lead, arsenic and mercury poisoning in the United States.
This overstates DMSA’s role. In the U.S., succimer (DMSA) is FDA-approved for pediatric lead poisoning, but BAL and calcium disodium EDTA remain standard treatments for severe lead poisoning, and BAL is still used for arsenic and mercury poisoning.
Full reasoning
This statement is incorrect because succimer (DMSA) did not replace BAL and EDTA across lead, arsenic, and mercury poisoning in U.S. practice.
Key evidence:
- FDA labeling for succimer (CHEMET) says it is indicated for lead poisoning in pediatric patients with blood lead levels above 45 mcg/dL. It is not FDA-labeled as the primary U.S. treatment for arsenic or mercury poisoning.
- Edetate calcium disodium (calcium EDTA) remains FDA-labeled for lead poisoning and lead encephalopathy in both pediatric patients and adults.
- ATSDR’s lead guideline says children with severe lead poisoning or encephalopathy should receive parenteral therapy with BAL and EDTA, showing those drugs remain in use for serious cases rather than having been “replaced.”
- For arsenic poisoning, ATSDR states that chelating agents such as dimercaprol can prevent effects if given within a few hours of exposure.
- For mercury poisoning, CDC notes that succimer is used off-label for mercury toxicity, while NCBI’s LiverTox says dimercaprol’s current indications include mercury and arsenic poisoning.
So while DMSA/succimer became an important and often preferred oral chelator for some situations, the article’s claim that it “quickly replaced both BAL and EDTA as the primary treatment” for all three poisonings in the United States is too broad and factually wrong.
6 sources
- DailyMed - CHEMET- succimer capsule
CHEMET is a lead chelator indicated for the treatment of lead poisoning in pediatric patients aged 1 year and older with blood lead levels above 45 mcg/dL.
- DailyMed - EDETATE CALCIUM DISODIUM injection
Edetate calcium disodium is indicated for the reduction of blood levels and depot stores of lead in lead poisoning (acute and chronic) and lead encephalopathy, in both pediatric populations and adults.
- Lead | Medical Management Guidelines | Toxic Substance Portal | ATSDR
Children with blood lead levels between 45 and 70 µg/dL should undergo chelation, usually with oral succimer; those with encephalopathy or with blood lead levels in excess of 70 µg/dL should be admitted to the hospital for parenteral therapy with BAL and EDTA.
- Clinician Brief: Arsenic | Environmental Health and Medicine Education | ATSDR
Chelating agents, such as dimercaprol, can prevent the effects of arsenic toxicity if administered within a few hours of arsenic exposure.
- Mercury Poisoning at a Home Day Care Center - Hillsborough County, Florida, 2015 | MMWR
Although approved for the treatment of lead poisoning, succimer is used off-label for treating mercury toxicity.
- Dimercaprol - LiverTox - NCBI Bookshelf
Dimercaprol ... is used to treat arsenic, gold, copper and mercury poisoning ... and, in combination with EDTA-calcium, acute lead poisoning.
The chemists learned that EDTA was particularly effective in treating lead poisoning.
This mixes up the history of BAL and EDTA. The Oxford wartime work produced dimercaprol (British anti-Lewisite) for arsenic gas poisoning; EDTA was introduced later for lead poisoning.
Full reasoning
This sentence conflates two different parts of chelation history.
- The Oxford wartime research on Lewisite led to the development of dimercaprol (British anti-Lewisite, BAL).
- NIH’s historical summary of EDTA says that the initial medical uses were BAL for arsenical poisoning and citrate for lead intoxication, and that EDTA was later used for lead poisoning, with FDA approval in 1953.
So the Oxford chemists searching for a Lewisite antidote did not “learn that EDTA was particularly effective in treating lead poisoning” as part of that wartime discovery. The relevant wartime antidote was BAL, while EDTA entered medical use later for lead and other indications.
2 sources
- Dimercaprol - LiverTox - NCBI Bookshelf
Dimercaprol was developed at Oxford University during World War II as a means of treating and reversing poisoning from Lewisite, an arsenical gas used in chemical warfare.
- Expired RFA-AT-01-004: EDTA CHELATION THERAPY FOR CORONARY ARTERY DISEASE
Initially, the medical use of chelating agents was to treat heavy metal poisonings, for example, British Anti-Lewisite (2,3-dimercaptopropanol) for arsenical poisoning ... Another chelating agent, ethylene diamine tetraacetic acid (EDTA) was also used to treat lead poisoning in a young child and following its initial approval by the Food and Drug Administration (FDA) in 1953...
The final results of the TACT trial were published in November 2012.
The TACT results were first presented in November 2012, but the trial’s main results were published in 2013, not November 2012.
Full reasoning
This statement gets the timing wrong.
NIH/NCCIH’s summary of the TACT study says the trial was conducted between 2003 and 2011 and that its results were reported in 2013. NHLBI’s BioLINCC study record likewise identifies the primary publication as the JAMA paper "Effect of disodium EDTA chelation regimen on cardiovascular events in patients with previous myocardial infarction: The TACT Randomized Trial" (2013;309(12):1241-1250).
November 2012 was when TACT results were publicly presented, but the main trial paper was published in 2013, so saying the "final results ... were published in November 2012" is inaccurate.
2 sources
- Chelation for Coronary Heart Disease: What You Need To Know | NCCIH
TACT was conducted between 2003 and 2011, and results were reported in 2013.
- BioLINCC: Trial to Assess Chelation Therapy (TACT)
Lamas GA, Goertz C, Boineau R, et al. Effect of disodium EDTA chelation regimen on cardiovascular events in patients with previous myocardial infarction: The TACT Randomized Trial. JAMA. 2013;309(12):1241-1250.
Deferoxamine, Deferasirox and Deferiprone - acute iron poisoning - iron overload
This groups three different drugs under the same indications, but only deferoxamine is indicated for acute iron poisoning. Deferasirox and deferiprone are used for chronic/transfusional iron overload.
Full reasoning
This table entry is inaccurate because it assigns acute iron poisoning to deferoxamine, deferasirox, and deferiprone as if all three share that indication.
According to current FDA/DailyMed labeling:
- Deferoxamine is indicated both as an adjunct to standard measures for the treatment of acute iron intoxication and for chronic/transfusional iron overload.
- Deferasirox is indicated for chronic iron overload due to blood transfusions, not acute iron poisoning.
- Deferiprone is indicated for transfusional iron overload in thalassemia (and related labeled uses depending on product), not acute iron poisoning.
So the table is wrong to list all three together as treatments for both acute iron poisoning and iron overload. Only deferoxamine has the acute-intoxication indication.
3 sources
- DailyMed - DEFEROXAMINE MESYLATE injection, powder, lyophilized, for solution
Deferoxamine mesylate for injection is an iron-chelating agent indicated: • As an adjunct to standard measures for the treatment of acute iron intoxication. • For the treatment of transfusional iron overload in patients with chronic anemia.
- DailyMed - DEFERASIROX tablet, film coated
Deferasirox tablets are an iron chelator indicated for the treatment of chronic iron overload due to blood transfusions in patients 2 years of age and older.
- DailyMed - DEFERIPRONE tablet, coated
Deferiprone tablets are an iron chelator indicated for the treatment of transfusional iron overload in adult patients with thalassemia syndromes when current chelation therapy is inadequate.