16 Q-CPR and Data Capture Using Q-CPR in Manual Defib Mode
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Parameter Block 2
In the CPR sub view, Parameter Block 2 contains the numeric values for compression rate, as well as
ventilation rate. Both rates are a moving average rate, measured per minute. Based on the Q-CPR
algorithm, the target compression rate is 100 compressions per minute within an acceptable range of
90-120 compressions per minute. The acceptable range for ventilation rate while CPR is being
administered is 4-16 ventilations per minute (to reflect 2005 resuscitation guidelines).
The acceptable range for ventilation rate following 60 seconds without compressions (such as while
rescue breathing is being administered) is 9-16 ventilations per minute.
If your device does not have invasive pressure active, the ventilation volume icon is displayed in
Parameter Block 2 and depicts the level of ventilation volume. A set of lungs graphically shows the four
states of volume, gradually moving from empty, to one-third full, then two-thirds full, and full. See
Figure 81. After a brief display, the icon returns to the empty state. If ventilation cannot be measured,
lungs marked with a “- ? -” appear.
Figure 81 Ventilation Volume Icons
NOTE The filling of the ventilation volume icon indicates that a ventilation was detected, and the ventilation’s
magnitude is indicated by the filling of the icon.
WARNING The graphical display of a set of lungs does not signify the actual filling (ventilation) or presence of
both lungs in the patient. The actual ventilation volume associated with filling of the lung icon will
vary from patient to patient. Actual tidal volumes should be determined based on chest rise.
Parameter Block 2 also contains a numeric value for No Flow Time. If no compressions are detected,
the No Flow Timer starts. The No Flow Time value is displayed, beginning at 2 seconds and
incremented with each additional second. A voice prompt is given every 15 seconds that compression
activity is not detected. The No Flow Time value is reset when a compression occurs or when the
Shock button on the HeartStart MRx is pressed. If the No Flow Time value exceeds 1 minute, it
is assumed that CPR compression activity has stopped intentionally and the value is reset to two dashes
(- -).
If monitoring CO
2
, the EtCO
2
numeric value is displayed in Parameter Block 2, along with its alarm
limits.
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