LOS ANGELES, CA (Catholic Online) - The study showed that cardiac stem cells have the potential to divide and develop into cardiomyocytes -- the muscle cells that make the heart contract and pump blood. Among 14 patients who responded to the stem cell treatment, the heart's blood-pumping efficiency increased from 30.3 percent before the treatment to 38.5 percent after.

In addition, some seven patients who underwent magnetic resonance imaging, the amount of dead heart muscle tissue decreased by 24 percent over four months and 30 percent over a year.

Seven control patients who did not receive the stem cell treatment showed no improvement.

"What is really exciting about the use of cardiac stem cells is we think we're attacking the fundamental problem: replacing dead tissue with new cardiac muscle," Bolli says. "Again, if these results are confirmed, this would be a true revolution in medicine; one of the biggest advances in cardiology in my lifetime."

The study was the first in humans to use cardiac stem cells, which were collected from patients' hearts during coronary artery bypass surgery. The cells were then purified and prepared in a six weeks process for infusion back into the damaged tissue.

Other studies have examined the potential of stem cells from patients' bone marrow to reverse the damage caused by heart attacks, with mixed results. Bone marrow stem cells are capable of becoming a variety of cell types, whereas cardiac stem cells are more specialized, and further along to road to becoming heart cells.

"This group has shown that you can prepare cardiac-specific stem cells and these cells are much more potent at cardiac repair than bone marrow cells," Dr. Josh Hare, chief of cardiology and director of the Interdisciplinary Stem Cell Institute at University of Miami says.

It must be noted that bone marrow stem cells are much easier to extract and prepare.

"From a convenience standpoint, it's obviously much easier to get the bone marrow," Hare says, explaining that bone marrow can be drawn from patients' bone and quickly turned around for reinjection into the heart. "The downside is they're not as effective. Clearly cardiac stem cells work so much better."

The Catholic Church is against embryonic stem cell research because it involves the destruction of human embryos. Pope John Paul II said embryonic stem-cell research is related to abortion, euthanasia and other attacks on innocent life. 

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