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Response time to open arteries for most critical patients still too slow
Date:11/16/2011

HOUSTON (Nov. 16, 2011) Cardiologists are quick to point to statistics showing that the "door-to-balloon" treatment time for heart attack patients has dropped significantly in the past few years.

But a retrospective study reveals that those who call 911 are most likely to have suffered a severe heart attack and despite receiving treatment quickly, they are still dying at unacceptable rates, say researchers at The University of Texas Health Science Center at Houston (UTHealth).

Results from the large retrospective study were presented yesterday at the American Heart Association's Scientific Sessions 2011 by lead author James J. McCarthy, M.D., assistant professor of emergency medicine at the UTHealth Medical School and director of the Emergency Center at Memorial Hermann-Texas Medical Center.

Door-to-balloon refers to the period of time from a patient's arrival at the hospital to when a guidewire reaches the blockage and opens the artery with the inflation of a tiny balloon.

The results of the study revealed that patients who call 911 instead of transporting themselves to the emergency room arrive 30 minutes faster and have shorter door-to-balloon times (56 minutes versus 70). Unfortunately, in spite of this they are more likely to be in shock (10.7 percent versus 3.5), suffer heart failure (9.9 percent versus 6.3) by the time they get to the hospital and more likely to die during their hospitalization (7.2 percent versus 2.4).

"Those who call an ambulance are three times more likely to die because their disease is worse. They are much sicker," McCarthy said. "We suspect that it means they have a larger infarct (area of damage). It's a vulnerable population that despite rapid emergency medical services (EMS) and hospital care still has higher mortality"

Previous UTHealth research has shown that if the artery is unblocked in the first hour after a heart attack, there is minimal damage. After three hours,
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Contact: Deborah Mann Lake
deborah.m.lake@uth.tmc.edu
University of Texas Health Science Center at Houston
Source:Eurekalert

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