FDA advisers back ABSORB-dissolving heart stent

Currently available stents are tiny, mesh-wire tubes used to prop open blood vessels. They have grown into some of the most lucrative medical implants ever developed, but use by cardiologists has been tempered by rare but risky complications.

Researchers first added drug-coatings to the devices in 2003 to prevent arteries from becoming reclogged due to scar tissue. But subsequent studies showed that the stented arteries could still develop blood clots, potentially triggering heart attack and death. To address that risk, Abbott and other device makers began developing dissolving stents that would slowly melt back into the body like stitches.

Abbott's stent managed to win a positive vote despite company studies that did not show superior outcomes for patients after one year, compared with older metal stents.

FDA scientists noted that rates of cardiovascular complications were actually slightly higher with Absorb than with Xience metal stents in a company study. But that difference - 1.7 percent - was not deemed statistically significant.

North Chicago, Illinois-based Abbott is tracking patients long-term to see if those with Absorb fare better several years later.

In a recent editorial, two prominent cardiologists pointed out that the Absorb stent has still not shown superior results to older models, even in a recent study that tracked patients for five years.

"'Here today, gone tomorrow' remains an incredibly intriguing concept that still needs further development and follow-up to reach its full potential," said Drs. David Holmes and Michael Mack, in last month's Journal of the American College of Cardiology.