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. 2014 Oct 22;9(10):e110274. doi: 10.1371/journal.pone.0110274

Figure 9. False apnea alarm in a patient breathing adequately on mechanical ventilation.

Figure 9

The respiratory waveform (bottom tracing labelled “Resp”) has a flat line appearance. The detection of respirations from the ECG lead (impedance method) is inaccurate in this patient, displaying an erroneous respiratory rate of 4 per minute.