Switch chest compressions every 2 minutes (or 5 cycles at 100-120 compressions/minute) to prevent fatigue and maintain effectiveness.
Fatigue during CPR reduces compression depth and rate, lowering survival chances. Switching rescuers every 2 minutes (or after ~200 compressions) ensures high-quality CPR. For single rescuers, fatigue sets in faster-prioritize automated devices or frequent breaks if possible.
Why Frequent Switches Matter
- Compression quality drops after 1-2 minutes due to muscle fatigue.
- Depth and rate decline by up to 30% after prolonged effort.
- Blood flow reduces, decreasing oxygen delivery to vital organs.
- Rescuer endurance varies-train to recognize early fatigue signs (shallow compressions, slowed pace).
Recommended Switching Intervals by Scenario
| Scenario | Switch Frequency | Compressions per Switch | Notes |
|---|---|---|---|
| Two or more rescuers | Every 2 minutes | ~200 (5 cycles at 100-120/min) | Coordinate switches during AED analysis to minimize interruptions. |
| Single rescuer (adult) | Every 2 minutes (if possible) | ~200 | Use hands-only CPR if exhausted; prioritize depth over rate. |
| Pediatric CPR (2+ rescuers) | Every 2 minutes | ~150 (higher rate: 100-120/min) | Fatigue occurs faster due to smaller chest size and deeper compressions (1/3 chest depth). |
| Prolonged CPR (>10 minutes) | Every 1-1.5 minutes | ~100-150 | Rotate rescuers more often to sustain quality during extended efforts. |
Signs You Need to Switch Sooner
- Compressions feel shallow (less than 2 inches/5 cm in adults).
- Your pace slows below 100 compressions/minute.
- You experience burning muscles or trembling arms.
- The AED prompts "push harder" or "faster."
- Your breathing becomes labored during compressions.
How to Minimize Fatigue During CPR
- Use proper technique: Lock elbows, lean over the chest, and use body weight-not just arms.
- Position yourself high: Kneel at chest level to avoid bending.
- Train regularly: Build endurance with practice sessions (e.g., 2-minute drills).
- Deploy mechanical devices: If available, use automated compression tools for consistency.
- Stay hydrated: Fatigue accelerates with dehydration, especially in high-stress situations.
Common Mistakes That Increase Fatigue
- Over-gripping hands: Keeps arms tense; use a relaxed but firm fist position.
- Bouncing between compressions: Wastes energy; allow full chest recoil without lifting hands.
- Holding breath: Leads to oxygen deprivation; exhale during compressions.
- Poor posture: Slouching or reaching strains back/shoulders-align shoulders over hands.