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Stem Cell Treatment Might Reverse Heart Attack Damage
Date:2/14/2012

e infusion patients' cardiac scar sizes had shrunk by about half. Scar size was reduced from 24 percent to 12 percent of the heart, the team said. In contrast, the patients receiving standard care experienced no scar shrinkage.

Initial muscle damage and healed tissue were measured using MRI scans.

After six months, four patients in the stem-cell group experienced serious adverse events compared with only one patient in the control group. At one year, two more stem-cell patients had a serious complication. However, only one such event -- a heart attack -- might have been related to the treatment, according to the study.

In a news release, Marban said that "the effects are substantial and surprisingly larger in humans than they were in animal tests."

Other experts were cautiously optimistic. Cardiac expert Dr. Bernard Gersh, a professor of medicine at Mayo Clinic, is not affiliated with the research but is familiar with the findings.

"This study demonstrates that it is safe and feasible to administer these cardiac-derived stem cells and the results are interesting and encouraging," he said.

Another specialist said that while provocative and promising, the findings remain early, phase-one research. "It's a proof-of-concept study," said interventional cardiologist Dr. Thomas Povsic, an assistant professor of medicine at the Duke Clinical Research Institute, in Durham, N.C.

And Dr. Chip Lavie, medical director of Cardiac Rehabilitation and Prevention at the John Ochsner Heart and Vascular Institute, in New Orleans, also discussed the results. He said that while the study showed that the cardiac stem cells reduced scar tissue and increased the area of live heart tissue in heart attack patients with moderately damaged overall heart tissue, it did not demonstrate a reduction in heart size or any improvement in the heart's pumping ability.

"It did not improve the ejection fraction, which is a very important measurement used t
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