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Study Points to Cause of Vioxx Heart Risk
Date:8/27/2007

along with these pain killers, the researchers proposed.

"If we can extend our work in humans and reduce TF levels, then we can reduce the risk of these side effects," Ghosh said. "In addition, measuring levels of TF could help identify people at high risk for cardiovascular side effects from cox-2 inhibitors," she said.

Ghosh believes the TF-linked risk applies to all cox-2 inhibitors, not just Vioxx or Bextra, which was also taken off the market in 2005. A third cox-2, Celebrex, remains on pharmacy shelves.

"Patients need to be careful when they take these medications, especially if they have a history of cardiac problems," she said.

This same risk may also apply to traditional pain medications called non-steroidal anti-inflammatory drugs (NSAIDs), such as Aleve and ibuprofen (brand named Advil, Motrin), Ghosh said. "No one has looked at what happens if you take high doses of NSAIDs," she said.

One expert believes that more study is needed, however, even when it comes to the cox-2s.

"We have always assumed that the problem with cox-2 inhibitors was linked to prostacyclin," said Dr. Steven E. Nissen, chairman of the department of cardiovascular medicine at the Cleveland Clinic and a noted expert on the drugs. "These [data] are suggesting that there may be more to the cardiovascular risk of cox-2 inhibitors, and it may relate to TF," he said.

However, blocking TF to mediate that risk is still speculative, Nissen said. "The problem is that there are no approved TF-blockers, so it's not even feasible to consider this," he said.

In addition, it still isn't definite that TF is an important mechanism in humans linking cox-2 inhibitors with cardiovascular risk, Nissen said.

"This study is very speculative, very preliminary," he said. "The finding needs to be confirmed in clinical trials."

More information

There's more on cox-2 inhibitors at the '/>"/>

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