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. 2020 Jul 4;1(6):1214–1221. doi: 10.1002/emp2.12184

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© 2020 The Authors. JACEP Open published by Wiley Periodicals LLC on behalf of the American College of Emergency Physicians.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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Monitor/defibrillator data from a patient with pulseless electrical activity following defibrillation showing a 22‐second interval during which the cardiopulmonary resuscitation (CPR) transitioned from manual chest compressions to mechanical chest compressions with a pause in compressions of about 6 seconds. Figure illustrates change in impedance morphology on transition to mechanical chest compressions, with waveforms becoming more square and having a consistent, precise rate. The top green curve shows the transthoracic impedance signal; the bottom black curve shows the ECG. Time format is HH:MM:SS.