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SECTION 8
SEE-THRU CPR
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The See-Thru CPR filter works only when the E Series defibrillator is monitoring CPR in Manual mode.
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The See-Thru CPR filter stops if:
— Diagnostic bandwidth mode is active.
— The unit is in pace mode.
— Patient impedance is invalid.
— CPR-D-padz electrodes are no longer detected.
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The See-Thru CPR filter will not remove all CPR artifact. Always stop CPR to verify the patient's ECG rhythm
before making treatment decisions.
The See-Thru CPR filter does not operate during ECG rhythm analysis. Always stop chest compressions during
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ECG rhythm analysis to avoid incorrect results caused by the presence of CPR artifact.
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The See-Thru CPR filter does not operate when pads are connected through an AutoPulse Plus.
®
See-Thru CPR
enables the rescuer to see a close
approximation of the patient's underlying ECG rhythm
while performing CPR. See-Thru CPR is available if the
E Series is monitoring CPR.
Chest compressions introduce CPR artifact into the ECG
signal. See-Thru CPR uses a filter that relies on the
correlation between CPR compressions, as detected by
the ZOLL CPR-D-padz electrodes, and the CPR artifact
to remove much, but not all, of the artifact from the ECG
signal. Under some conditions, residual noise after
filtering can obscure the ECG rhythm, requiring the
rescuer to stop CPR to assess the ECG. For example, in
the case of asystole or low amplitude PEA, the residual
artifact seen after filtering may look like fine ventricular
fibrillation.
Because the filtered ECG signal may contain residual
chest compression and/or filtering artifacts, a rescuer
should always follow the standard procedure of stopping
CPR to assess the patient's ECG rhythm before
determining treatment.
Using See-Thru CPR
To use See-Thru CPR
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The E Series unit must be monitoring CPR.
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CPR-D-padz electrodes must be attached to the unit.
When a rescue begins, an E Series unit automatically
starts filtering the CPR artifact after detecting the first 3 to
6 compressions. The filtered ECG, with the label
"FILT ECG," may be displayed on the second waveform
(by pressing the Wave 2 softkey).
9650-1210-01 Rev. T
WARNING
See-Thru CPR filtering continues as long as the
CPR-D-padz electrodes detect compressions and patient
impedance is valid. When no compressions are detected
or one of the conditions noted above occurs, See-Thru
CPR filtering stops, unfiltered ECG signals are displayed,
and the unit changes the label on the second waveform
to "ECG." When compressions resume, filtering
automatically restarts after 3 to 6 chest compressions.
If configured to display the CPR Dashboard, the E Series
unit can also be configured to display the filtered ECG in
Trace1.
Examples
The following examples show the effects of See-Thru
CPR filtering on ECG signals contaminated with CPR
artifacts.
Each example includes:
ECG signal with CPR artifact.
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ECG signal after the See-Thru CPR filter has
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removed CPR artifact.
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Indication of the period during which See-Thru CPR
is active.
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CPR signal to show when CPR activity occurred.
8-1
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Troubleshooting
