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impedance threshold device

im·ped·ance thresh·old de·vice

/im peed ns thresh ohld dih vahys/

Noun

A device inserted between the mask and bag during a cardiac arrest that acts as a “supervalve” that allows air to enter the lungs during bag compression. During cardiac compression, the valve allows air to escape from the lungs, but prevents atmospheric air from entering the chest. A small amount of negative pressure is created, promoting better blood flow through the heart and its coronary arteries.