Manual A Textbook on EDTA Chelation Therapy: Second Edition

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We planned to conduct a meta-analysis, however, the limited number of trials, their clinical heterogeneity, and the variability of outcomes made pooling impossible. We abstracted quality criteria data from each of the RCTs assessed based on randomization, sample size determination, dropouts, intention to treat, blinding, and allocation concealment.

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We found a total of fourteen studies for further analysis [ 4 , 8 - 20 ]. Of these, we excluded seven, as they were either review articles or non-randomized studies [ 8 - 14 ]. Seven studies of randomized controlled trials have been included in this systematic review [ 4 , 15 - 20 ]. Of the seven manuscripts, five were of distinct sample populations [ 4 , 16 - 18 , 20 ], with three of the trials analyzing data from only one participant sample [ 15 , 16 , 19 ].

Except for one trial published in Danish, all trials were published in English between and The data from the Danish trial was also published in English, however, thereby not requiring translation or inclusion. Since the most recent systematic review, a Cochrane review, by Villaruz et al. The conclusion found by Villaruz et al was that 'there is insufficient evidence to decide on the effectiveness or ineffectiveness of chelation therapy in improving clinical outcomes of patients with atherosclerotic cardiovascular disease' [ 6 ]. The most recent placebo-controlled trial conducted by Knudtson and colleagues in [ 4 ] explored the effect of chelation therapy on ischemic heart disease.

When compared to placebo, a total of 33 rounds of EDTA treatment per patient was found to have no effect in any of the outcomes measured [see additional file 2 ]. Both groups exhibited improvements from baseline but this was independent of EDTA use.


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Two of the earliest randomized controlled trials, by Kitchell et al. In the first trial by Kitchell et al. This crossover trial was halted early because 3 of the 5 members in the placebo group dropped out due to a lack of improvement. In the trial by Olszewer et al. Of all the trials analyzed, however, these studies used the least number of participants, with sample sizes of 9 and 10 respectively.

Since the two positive trials by Kitchell and Olszewer, three larger trials have been completed. None of the more recent trials has indicated any benefit from EDTA therapy on cardiovascular disease. One group of investigators, Guldager et al. None of these outcomes demonstrated evidence of improvement using parenteral EDTA chelation.

Two subsets of this initial sample were analyzed separately; one for digital angiograms and transcutaneous oxygen profiles [ 19 ], and one for blood cholesterol levels [ 15 ]. In neither of these outcomes was there any evidence of improvement dependent the intervention alone.

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In the trial by Van Rij et al. As described above, the most recent trial by Knudtson et al. We assessed for adverse effects amongst the trials and found only a few cases of adverse events that might be attributed to the EDTA [see additional file 2 ]. In the EDTA treatment vs. No other adverse effects were noted in any of the RCTs. In an assessment of the articles for quality criteria, two of the trials did not describe randomization [ 15 , 17 ]; sample size determination was only described in two trials [ 4 , 20 ]; drop outs were excessive in one [ 17 ]; intention to treat analysis was performed in four trials [ 4 , 18 - 20 ]; blinding was inadequate in two of the trials [ 17 , 18 ]; and allocation concealment was only adequate in one trial [ 4 ].

The two trials with the highest quality [ 4 , 20 ] were the most recent and, as discussed above, found no evidence of efficacy for EDTA chelation therapy in the treatment of cardiovascular disease. The overall evidence on EDTA chelation therapy argues against any clinical benefit with respect to cardiovascular disease.

The evidence that we were able to find in support of EDTA chelation for cardiovascular disease relies almost entirely on uncontrolled trials and a large body of anecdotal evidence. Given the parameters of the evidence so far, and in keeping with patient values, it is encouraging that the NIH is funding a large simple trial. A 5-year multi-center randomized placebo-controlled trial will hopefully deliver a conclusive answer on the question of whether or not intravenous EDTA infusion has any role in the treatment of cardiovascular disease.

Until such time, clinicians should openly discuss the use of complementary and alternative medicine and specifically chelation therapy with patients in an informed and non-judgmental manner. Clinicians should also discuss potential risks associated with EDTA chelation therapy and the current lack of evidence supporting it use in cardiovascular disease.

Proposed mechanisms of action for the reversal of cardiovascular disease by EDTA include: calcium chelation resulting in dissolution of atheromatous plaques, free radical scavenging action, reduction of total body iron stores, cell membrane stabilization, arterial dilatation due to calcium channel blocking action, improvement of arterial wall elasticity and increased production of nitric oxide [ 4 , 21 ].

Critics have taken issue with some of these mechanisms, however, claiming the use of outdated concepts on the pathophysiology of atherosclerosis and for instance, the inability of EDTA, a water soluble compound, to effectively complex with plaque calcium [ 3 ]. Given the widespread usage of EDTA chelation therapy, an assessment of its safety is crucial.

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EDTA is responsible for a wide range of potential side effects including gastrointestinal and musculoskeletal complaints, diaphoresis, fever, leukopenia, thrombocytopenia, kidney damage, mineral depletion, and hypocalcemia [ 19 , 22 - 24 ]. With proper dose control and assessment of kidney function, however, EDTA is not considered to be a particularly high-risk therapy and there is little doubt that it is safer than coronary bypass surgery.


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  • However, if EDTA has no efficacy beyond placebo, then the possibility of adverse effects, the cost of treatment, and potential to avoid greater risk may well result in unjustifiable morbidity and mortality. There are several limitations to consider in our review. We cannot determine to what extent publication bias has affected our results.

    Empirical evidence has shown that negative trials in CAM and other fields are less likely to be published [ 25 ]. Claims have been made however, that evidence in favor of EDTA chelation therapy may have been suppressed [ 26 ]. To mitigate as much as possible against these circumstances, we conducted thorough systematic searches of the literature.

    We contacted some, but not all of the authors of the studies to confirm our interpretation of the results. It may be that authors of original studies excluded important information from the published manuscripts in order to reduce the page length or to follow reviewers' suggestions [ 27 ]. In many of the trials there was a significant improvement in outcome measures for both control groups and chelation groups.

    This is a clear indication of the need to conduct controlled trials in order to pick up a type I error that might mistakenly attribute efficacy to the therapy in question. There is a large body of literature to support the use of EDTA in the treatment of cardiovascular disease; however, the vast majority of the literature relies on uncontrolled evidence. These criticisms include but are not limited to: too short of a treatment schedule, claims of incorrect statistical manipulation of the data, improper randomization, and high dropout rates [ 26 , 28 - 30 ].

    The earliest trials incorporated 20 treatments of chelation therapy and the American College for Advancement in Medicine ACAM , considered an authority in chelation therapy, claims that at least 30 treatments may be required for improvements to be noted. In the most recent study by Knudston et al. In our review we included quality criteria and did not find evidence of any bias, however, we did not obtain the raw data needed to conduct an independent reanalysis.

    The findings of this systematic review should be of interest to clinicians and patients alike. The use of EDTA by patients as a treatment for cardiovascular disease and as an adjunct or alternative to surgery is not supported by the highest quality of evidence. Considering the cost incurred by patients who use EDTA chelation therapy and the potential for harm associated with any intravenous intervention including the potential for adverse effects attributable directly to EDTA, clinicians should inquire about patient use and highlight the lack of evidence to support its usage.

    A Textbook on Edta Chelation Therapy Second Edition

    DS drafted the manuscript. EM edited the manuscript. National Center for Biotechnology Information , U. BMC Cardiovasc Disord. Published online Nov 1.

    Textbook on EDTA Chelation Therapy: Second Edition / Edition 2

    Author information Article notes Copyright and License information Disclaimer. Corresponding author.


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    • Dugald MR Seely: ude. Received Jul 8; Accepted Nov 1. This article has been cited by other articles in PMC. Additional File 2 table Randomized controlled trials assessing the therapeutic use of EDTA for atherosclerotic cardiovascular disease. Abstract Background Numerous practitioners of both conventional and complementary and alternative medicine throughout North America and Europe claim that chelation therapy with EDTA is an effective means to both control and treat cardiovascular disease.

      Methods We conducted a systematic review of 7 databases from inception to May Results A total of seven articles were found assessing EDTA chelation for the treatment of cardiovascular disease. Conclusion The best available evidence does not support the therapeutic use of EDTA chelation therapy in the treatment of cardiovascular disease.

      Background Chelation therapy, a program of repeated intravenous administration of ethylene diamine tetraacetic acid EDTA , often given in combination with vitamins and minerals, has been touted as a safe alternative treatment for atherosclerotic vascular disease [ 1 - 3 ]. Data abstraction We abstracted outcome data on ECG tests, exercise tests including treadmill tests, cycling time, time to ischemia, pain free and maximal walking distances, subjective symptoms of angina, ankle brachial indices, digital subtraction angiograms, transcutaneous oxygen tension, blood cholesterol levels, and quality of life measures.

      Results Main findings We found a total of fourteen studies for further analysis [ 4 , 8 - 20 ]. Study characteristics and adverse effects Since the most recent systematic review, a Cochrane review, by Villaruz et al. Study quality In an assessment of the articles for quality criteria, two of the trials did not describe randomization [ 15 , 17 ]; sample size determination was only described in two trials [ 4 , 20 ]; drop outs were excessive in one [ 17 ]; intention to treat analysis was performed in four trials [ 4 , 18 - 20 ]; blinding was inadequate in two of the trials [ 17 , 18 ]; and allocation concealment was only adequate in one trial [ 4 ].

      Table 1 Quality criteria of the randomized controlled trials assessed. Open in a separate window. Discussion The overall evidence on EDTA chelation therapy argues against any clinical benefit with respect to cardiovascular disease. Conclusion The findings of this systematic review should be of interest to clinicians and patients alike. Competing interests The author s declare that they have no competing interests. Figure 1. Flow-chart detailing study selection and exclusion for systematic review. Chelation Therapy IS used by "alternative" practitioners to treat both autism spectrum disorders and artherosclerosis.

      Intersofia , 8 October UTC. Intersofia changed the section to read: "Chelation agents are also sometimes used by alternative practitioners to treat conditions they believe to be caused by heavy metal poisoning , including autism and coronary artery disease. In , researchers, sponsored by Thiemann , at the University of Calgary reported that cardiac patients receiving chelation therapy for artherosclerosis fared no better than those who received placebo treatment [5].

      Until such is done, "suggestions" are worthless POV. Please refrain from listing them here, or state the whole story. Intersofia , 15 October UTC. Correction to header, which lead off by mentioning EDTA. EDTA continues to have alternative uses in heart disease and metal chelation.

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