Rare heart problem decreases in clot-busting era

DURHAM, N.C. -- The incidence of cardiac tamponade, an infrequent but potentially fatal event following a heart attack, has not increased despite the widespread use of clot-busting and blood-thinning medications, according to an new analysis by Duke Clinical Research Institute investigators. Since bleeding is the major side effect of such medications, researchers said concerns with increased rates of tamponade existed.

Cardiac tamponade occurs when fluids or blood fill the pericardium, the tough sac enclosing the heart. After an acute heart attack, heart muscle can rupture leading to bleeding into the pericardial sac. Fluids filling the pericardium can cause a rapid drop in blood pressure, leading to loss of consciousness or death. Often a medical emergency, physicians quickly treat it puncturing the pericardium and draining the accumulated fluid.

Prior to widespread use of clot-busting, or fibrinolytic, drugs in the early 1990s, between 4 and 8 percent of acute heart attack patients suffered from cardiac rupture and tamponade.

In their analysis of more than 100,000 patients worldwide, the Duke researchers found that 0.85 percent of acute heart attack patients suffered from tamponade while in the hospital. Duke cardiologist Manesh R. Patel, M.D., presented the results of the analysis Nov. 9, 2004, at the American Heart Association's annual scientific sessions in New Orleans.

"The rates of tamponade in our population of clinical trial patients is similar to if not lower that reported in the pre-fibrinolytic era, and it supports the conclusion that the rate is not significantly higher with these therapies, as was once the general concern," Patel said.

While the researchers found a low incidence of tamponade in general, they cautioned that physicians should still pay close attention to their acute heart attacks patients, since their analysis showed that treatment delays increased the likelihood of cardiac tamponade occurring.


Contact: Richard Merritt
Duke University Medical Center

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