The depth of chest compression for adult during CPR:

Appeared in: NVS- 2025

Explanation

The recommended depth for chest compressions in an adult is 5 to 6 cm (2 to 2.4 inches).
This depth is based on resuscitation guidelines (like those from the AHA) to ensure effective blood circulation to vital organs.
Compressing within this range balances the need for adequate cardiac output with the risk of causing injury from compressions that are too deep.
For children who have reached puberty, the adult compression depth of 5-6 cm is used.

Option A: A depth of 2-3 cm is too shallow for an adult and will not generate sufficient intrathoracic pressure to circulate blood effectively.
Option B: A depth of 1.5-2 cm is extremely shallow and completely ineffective for an adult. This depth is even insufficient for infants.
Option C: A depth of 6-7 cm is too deep. Compressions greater than 6 cm increase the risk of iatrogenic injuries like rib fractures, lung contusions, or liver lacerations without improving survival.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain CPR chest compression depth for adults as background academic context rather than a clinical decision trigger.
Performing high-quality CPR is a fundamental nursing skill that directly impacts patient survival rates from cardiac arrest. Knowing the correct parameters (rate, depth, recoil) is non-negotiable.
Modern defibrillators and CPR feedback devices provide real-time data on compression depth and rate, helping rescuers adhere to guidelines and improve CPR quality during a resuscitation event.
What if the patient was an infant (under 1 year)? The compression depth would change to approximately 4 cm (or one-third the chest's AP diameter), and the technique would switch to two fingers (for a single rescuer) or the two-thumb encircling method (for two rescuers).

How to Approach the Question

First, identify the key components of the question: 'depth', 'chest compression', and 'adult'.
This is a factual recall question that tests your knowledge of Basic Life Support (BLS) guidelines.
Recall the specific parameters for adult CPR as defined by a major resuscitation council (e.g., American Heart Association).
The recommended depth for an adult is at least 5 cm (2 inches) but no more than 6 cm (2.4 inches).
Evaluate the given options against this standard. '5-6 cm' is the only range that fits the guideline.
Eliminate other options: 2-3 cm and 1.5-2 cm are too shallow, and 6-7 cm is too deep and potentially harmful.

Concept Tested & Keywords

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E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 610-612

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 763-765

Practise the full NVS- 2025

Attempt every question from this paper in a timed mock, then review the full solution for each one.