CPR Priority: Start Chest Compressions Immediately for Adult Cardiac Arrest

For witnessed adult cardiac arrest, the single most critical action is to begin high‑quality chest compressions without delay.

Why Compressions First?

• Time‑sensitive: each minute without CPR reduces survival 7–10%.
• Circulates oxygenated blood to heart and brain, buying time for defibrillation.
• Defibrillation is definitive for shockable rhythms (VF/pVT), but AED may not be immediately available.
• Hands‑only CPR (compressions only) is recommended for lay rescuers; removes barrier of rescue breaths.

High‑Quality Compression Metrics

• Rate: 100–120/min
• Depth: ≥5 cm (2 in) adults
• Full chest recoil
• Minimize interruptions (<10 s for rhythm check/shock)
• Rotate compressors every 2 min to avoid fatigue

Sequence (C‑A‑B)

1. Compressions (push hard, push fast)
2. Airway (head‑tilt/chin‑lift)
3. Breathing (2 breaths after 30 compressions if trained)

Key Message

Push hard, push fast, don’t stop. Early compressions + early defibrillation = best survival.