Certain Reflux Drugs Tied to Higher Post-Angioplasty Death Rate

Nov. 17 -- MONDAY, Nov. 16 (HealthDay News) -- People taking the acid reflux drugs Prilosec or Protonix in combination with blood thinners such as Plavix have a higher risk for death after angioplasty than people who don't take the two popular antacids, a new study has found.

The people in the study, which is to be presented Monday at the American Heart Association's annual meeting in Orlando, Fla., were undergoing what doctors call "percutaneous coronary intervention," or PCI, a common procedure used to widen a narrowed artery. PCI typically involves balloon angioplasty followed by the insertion of a drug-emitting stent, a tiny mesh tube, to keep the vessel open.

Study author Dr. Joseph Sweeny, an assistant professor of medicine at Mount Sinai Medical Center in New York City, said that the clinical implications for users of these reflux drugs -- called proton pump inhibitors (PPIs)-- remain unclear.

"It's a moving target," Sweeny said, adding that, "although certain confounders are going to be at play that do cause limitations of the study, in my opinion the data speaks for itself. We found an overall increased mortality in this patient population that takes a PPI with clopidogrel [Plavix]. The problem was I was not able to look at specific cause of mortality."

One expert agreed that the study, while interesting, does not prove cause-and-effect.

"All this shows is that people taking PPIs have a worse outcome than those not taking PPIs," said Dr. Chet Rihal, director of the Mayo Clinic's catheterization lab in Rochester, Minn. "This does not prove there's causation. That would be like saying that carrying matches is associated with lung cancer. It is associated, but it doesn't mean it causes lung cancer."

"These data do not show that patients should stop taking PPIS, and, in fact, it would be dangerous for patients to stop PPIs or other medication without a physician's advice," Rihal said.

The mortality increase shown by the study is not surprising, he added. "People who are older are the ones who get stents and tend to get ulcers and stomach problems [warranting use of PPIs] so we would expect them to have a worse prognosis," Rihal said. "Whether it's due to medical problems or whether it has something to do with a drug-drug reaction is unclear."