Page 27 - EMS CPR Manual V1

Depth of compressions
The depth of compressions required will vary for each person due to his or her size and structure. The most accurate measurement for such a diverse range of sizes is to achieve a compression that is at least 1/3 of the chest depth or greater than 5cm. Whilst compressions that are too deep may be detrimental to the casualty, compressions that are too shallow are associated with unfavorable outcomes. If in doubt, push harder to ensure that you achieve the minimum compressions of 1/3 the depth of the chest.
Rate of compressions
First Responders should perform chest compressions for all ages at a rate of 100 to 120 compressions per minute (this equates to almost 2 compressions every second).
It is noted that the number of compressions delivered each minute will vary and be reduced by interruptions given by rescue breaths.
Optimal compressions rates are 100 to 120 compressions per minute. Compression rates less than 100 and more than 140 are associated with less favorable outcomes.
Ratio of compressions to breaths
CPR should be delivered at a ration of 30 compressions to 2 rescue breaths. See Rescue Breaths See the ‘Rescue Breaths’ section
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CARDIO PULMONARY RESUSCITATION