Administering CPR, Photo by jdurham, morguefileLast January, a Minnesota man’s heart stopped beating for an amazing 96 minutes. Emergency room doctors thought he was dead. But first responders who gave CPR on the scene decided not to give up, in part because of technology that allowed them to see their efforts were working.

It’s called capnography, and it measures how much carbon dioxide is being expelled with each breath.

 

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Photo by jdurham, morguefile

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