A review of possible STEMI cases presenting at the University of Michigan Health System's emergency department found the rate of false activation of the cardiac catheterization laboratory grew to 40% in 2011 from 15% in 2007. False activations accounted for 28% of the total, according to the analysis published in the American Journal of Managed Care. While researchers said they couldn't directly link the increase to efforts to cut PCI door-to-balloon times, "their concurrence is notable," the authors wrote.

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