CPR for Adults: When to Start Chest Compressions & Breaths

Start CPR compressions immediately if the person:

  • Suddenly collapses
  • Is unresponsive
  • Is not breathing (or only gasping)

Call emergency services, begin high-quality chest compressions (100–120/min, 2–2.4" depth), and provide rescue breaths if trained (30:2 ratio). Early CPR saves lives.

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