BLS C-A-B Algorithm

Last updated: December 20, 2020

2020 updated guidelines have been published by American Heart Association®, by enrolling in our courses you will receive the current learning materials (2016 guidelines) now and also AUTOMATICALLY have free access to the 2021 guidelines when available. Please note that our company typically implements new training guidelines up to a year before AHA releases their updates.


  • Compression rate of 100-120 per minute, pushing hard and fast in chest center.
  • Depth of 2" - 2.4” for adults (5-6cm).
  • Children and infants: 1/3 depth of the chest (2” and 1.5”).
  • Allow complete chest recoil between breaths.

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  • Head tilt/chin lift: tilt victim's head back and lift the victim's chin to open the airway.
  • Infant airway can be opened by placing the head in the “sniffing position.”


  • Give rescue breathing, mouth to mouth, in the apneic patient with a pulse.
  • For effective breathing, watch for chest rise and avoid excessive ventilation. The ratio of chest compressions to breaths is 30 to 2.
  • 10 BREATHS should be delivered each minute, or one breath every six seconds. Each breath should be delivered over 1 second. Observe visible chest rise.
This page is written by on Sep 8, 2019.
This page is last reviewed and updated by on Sep 8, 2019.