Study finds heart chelation therapy effective but raises questions
By Elizabeth Cohen and John Bonifield, CNN
November 6, 2012
- Chelation therapy for heart patients involves a series of IV drug infusions
- A new study shows the therapy was effective at preventing heart problems
- But some experts are challenging the validity of the study and its results
- The study "raises more questions that must be answered," says one expert
(CNN) -- In results that are stunning cardiologists, a new study shows a "fringe" alternative treatment for heart disease was found to be very effective at preventing heart problems -- but the report is so controversial even its lead author is questioning the results.
The patients in the study had had heart attacks, and were assigned to receive either a placebo or a series of intravenous drug infusions called chelation therapy, an unorthodox treatment that has long been looked down upon by cardiologists.
In the report -- the first large, long-term trial of chelation for heart patients -- the therapy reduced the risk of heart attacks, deaths, strokes and other cardiovascular problems by 18%.
"If this were true, it would be significant. It would put this therapy in the same ballpark as high blood pressure drugs, or drugs used to lower cholesterol," said Dr. Steven Nissen, chair of the department of cardiovascular medicine at the Cleveland Clinic, who doubts the results of the study.
A doctor with the American Heart Association warned that the results "should not be interpreted as an indication to adopt chelation therapy into clinical practice."
"(The study) raises more questions that must be answered before we're ready to act on the observations reported today," said Dr. Elliott Antman, professor of medicine at Harvard Medical School.
Even the lead author of the study tempered his enthusiasm about the results by warning that they might not be valid.
"The most exciting part of this study is that there may be an unexpected signal of benefit," Dr. Gervasio Lamas, chief of Columbia University Division of Cardiology at Mount Sinai Medical Center in Miami Beach, Florida, said in a press release put out by the American Heart Association. "We need to understand whether the signal is true, or whether it occurred by chance."
Doctors who practice chelation welcomed the new study results, which were announced at the American Heart Association's annual meeting in Los Angeles.
These doctors believe chelation can help remove heavy metals from the body. Chelation is approved by the Food and Drug Administration for the treatment of lead poisoning, but doctors are free to use it for other purposes.
"I'll be pushing this data to my patients, and I'll be reaching out to local cardiologists, because chelation should be a part of the regular regimen for heart patients, like taking an aspirin or a statin," said Dr. Kirti Kalidas, who charges his heart patients in Orlando, Florida, around $3,000 for a full round of chelation treatments.
This enthusiasm is exactly what frightens many doctors. Chelation is already popular -- more than 100,000 people said they'd used it in the past 12 months, according to a 2007 report from the Centers for Disease Control and Prevention -- and they fear the new study results will encourage more people to use it.
In 2006, the CDC reported that two children and one adult had died after receiving chelation. They all developed dangerously low calcium levels, which can cause the heart to stop beating.
In this new study, one patient receiving the therapy died and another had a "severe adverse event." Both events were "possibly or definitely related to study therapy," according to the study author's slide presentation. A patient who received a placebo solution also died, and another had an adverse event.
It wasn't clear from the presentation exactly how the patients were harmed, and Lamas, the lead study author, declined to answer questions about the study until the research is published in a medical journal.
Some doctors worry patients will hear only the positive results of the study and not the possible dangers, and would opt for it over proven treatments such as bypass surgery.
"I'm fearful that patients will hear the sales pitch for this treatment and, not being well-versed in medicine, will succumb to the seduction of this therapy," said Nissen, adding that chelation might sound more appealing than an invasive procedure like bypass surgery.
Dr. Kimball Atwood agrees. In an article about the chelation trial, Atwood and his colleagues labeled the $30 million study funded at taxpayer expense by the federal National Institutes of Health "unethical, dangerous, pointless, and wasteful" and called for it to be abandoned.
"These new study results will encourage chelationists, and state medical boards will be loath to step in because the chelationists have this study on their side," said Atwood, a clinical assistant professor of anesthesiology at Tufts Medical Center.
"Every now and then somebody will get killed," he added.
Kalidas, the doctor who practices chelation, disagreed, saying this study would help -- not hurt -- patients.
"Chelation has been lifesaving for hundreds of my patients," he said.