The 2010 AHA ACLS Guidelines put forth a major change in the sequence of steps in basic life support.
High quality CPR is reemphasized for its primary importance in any resuscitation.
When a patient ceases to breathe, they are in respiratory arrest. Advanced Cardiac Life Support recognizes respiratory arrest as the absence of any respirations, or ineffective respiration (unable to maintain oxygenation) with a pulse.
It is important to know the H's and T's of ACLS in any scenario. You will be likely to use them when you utilize the ACLS Megacode Simulators.