The ECG cannot be reliably interpreted while chest compressions are being performed. Each chest compression will cause a false spike on the ECG that does not represent the underlying spontaneous electrical activity of the heart. If you look closely at the trace you may be able to see spikes at 100-120 beats / min. The real rhythm can only be interpreted when chest compressions are paused.
See also: Quality Issues and Artefact
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- Thaler, MS (2018) - The Only EKG Book You'll Ever Need, 9th edn, Lippincott Williams and Wilkins