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Vital signs of a patient’s heart rate and rhythm are displayed during a mass casualty drill on June 18, 2021. (U.S. Marine Corps photo by Cpl. Karis Mattingly). Original public domain image from Flickr.

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Vital signs of a patient’s heart rate and rhythm are displayed during a mass casualty drill on June 18, 2021. (U.S. Marine Corps photo by Cpl. Karis Mattingly). Original public domain image from Flickr.

More