When performing cardiac compression on an adult client, it is essential to exert vertical downward pressure, which depresses the lower sternum at least?

Appeared in: SCTIMST Staff Nurse - 2015 (Set-B)

Explanation

The correct depth for chest compressions in an adult is 1 1/2 to 2 inches (or approximately 4 to 5 cm).
This depth is required to physically compress the heart between the sternum and the spine, which is essential for creating blood flow during CPR.
Compressions at this depth generate the necessary intrathoracic pressure to circulate oxygenated blood to the brain and other vital organs, preventing irreversible damage.
While current guidelines recommend 'at least 2 inches (5 cm),' the range of 1 1/2 to 2 inches is the only option provided that approaches this effective depth and was the previous standard.

Option A: A compression depth of 1/2 to 3/4 inch is severely inadequate for an adult. It would fail to compress the heart sufficiently to generate any meaningful blood flow.
Option B: A compression depth of 1/4 to 1 inch is extremely shallow and ineffective for an adult. It would not create the pressure needed to circulate blood.
Option C: A compression depth of 1 to 1 1/2 inches is still too shallow for an adult. While better than the other incorrect options, it falls short of the minimum depth required for effective perfusion.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Cardiopulmonary Resuscitation (CPR) Technique for Adults as background academic context rather than a clinical decision trigger.
High-quality CPR is the cornerstone of basic life support and directly impacts survival rates from cardiac arrest. Nurses must be proficient in performing CPR according to current guidelines.
Performing compressions at the correct depth and rate is physically demanding. To prevent rescuer fatigue and a decline in compression quality, it is recommended to switch the person performing compressions every 2 minutes or 5 cycles.
What if the patient was an infant (less than 1 year old)? The compression depth would change significantly. For an infant, the correct depth is about 1.5 inches (4 cm), or approximately one-third the anterior-posterior diameter of the chest.

How to Approach the Question

First, identify the key elements of the question: 'cardiac compression,' 'adult client,' and the question about depression depth.
This is a factual recall question that tests your knowledge of specific parameters for a standard medical procedure (CPR).
Recall the American Heart Association (AHA) guidelines for adult CPR. Focus on the metric for compression depth.
Evaluate the given options. The values are in inches. Remember that the guideline is approximately 5 cm, which is about 2 inches.
Select the option that best matches the standard guideline. In this case, '1 1/2 to 2 inches' is the closest and most appropriate answer among the choices.

Concept Tested & Keywords

QNEvvuWPFYcdMk6JkHfx6t

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 SCTIMST Staff Nurse - 2015 (Set-B)

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