Q. What is the recommended depth of chest compressions in adults according to current AHA guidelines?
A) At least 2 cm.
B) At least 4 cm.
C) At least 5 cm but not more than 6 cm.
D) At least 7 cm.
✓ The Correct Answer is: C) At least 5 cm but not more than 6 cm.
High quality cardiopulmonary resuscitation (CPR) is the cornerstone of successful cardiac arrest management.
According to the latest American Heart Association (AHA) Basic Life Support (BLS) and Advanced Cardiovascular Life Support (ACLS) guidelines, the recommended chest compression depth for adults is at least 5 cm (2 inches) but not more than 6 cm (2.4 inches).
Compressions that are too shallow fail to generate adequate blood flow to the heart and brain, reducing the chances of return of spontaneous circulation (ROSC).
Conversely, compressions that are excessively deep may increase the risk of complications such as rib fractures, sternal fractures, and internal organ injuries.
Maintaining the recommended depth helps maximize perfusion while minimizing trauma.
∆ Key Components of High Quality Adult CPR
For optimal outcomes, rescuers should ensure-:
Compression depth: 5–6 cm.
Compression rate: 100–120 compressions per minute.
Complete chest recoil after each compression.
Minimal interruptions during CPR.
Avoid excessive ventilation, which can reduce coronary perfusion.
These principles significantly improve survival and neurological outcomes following cardiac arrest.
∆ High-Yield Exam Pearls:
Adult chest compression depth: 5–6 cm.
Compression rate: 100–120/min.
Compression-to-ventilation ratio (single rescuer): 30:2.
First step in BLS: Ensure scene safety and assess responsiveness.
Early defibrillation remains the definitive treatment for shockable rhythms such as ventricular fibrillation and pulseless ventricular tachycardia.
✓ One-Liner to Remember:
"Adult CPR: Push hard (5–6 cm), push fast (100–120/min), allow full recoil, and minimize interruptions."
✓ Take-Home Message:
The current AHA guidelines recommend a chest compression depth of at least 5 cm but not more than 6 cm in adults.
High quality compressions with the correct depth, appropriate rate, full chest recoil, and minimal pauses are essential for improving survival after cardiac arrest.
