# A 4-month-old becomes unresponsive and apneic. A pulse is present. The team calls for help, supplies oxygen and begins bag-mask ventilation. The displayed checks occur while the nurse corrects the mask seal and reassesses. Click the first check that meets the indication to add chest compressions.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=581199&lang=en  
> language: en  
> subject: Physiological Adaptation  
> category: PA

## Question

A 4-month-old becomes unresponsive and apneic. A pulse is present. The team calls for help, supplies oxygen and begins bag-mask ventilation. The displayed checks occur while the nurse corrects the mask seal and reassesses. Click the first check that meets the indication to add chest compressions.

![](https://mymerci.kr/data/nclex/hotspot/regen_20260908_2350/HSR536.svg)

## Explanation

D combines a heart rate below 60/min with persistent poor perfusion despite effective ventilation and oxygen support.

## In-depth explanation

Quick answer
D. D combines a heart rate below 60/min with persistent poor perfusion despite effective ventilation and oxygen support.
Why this is the best choice
The low rates at the first two checks accompany ineffective ventilation. Correcting chest expansion is essential. At C, the pulse is above 60/min. At D, effective ventilation is documented but bradycardia and poor perfusion persist, meeting the pediatric criterion to begin CPR without further delay.
Clinical picture
The observations are fictional teaching data. Apply the stated context; the selected feature does not by itself replace a complete bedside assessment.
Memory hook
Combine heart rate, perfusion and response to oxygenation and ventilation.
Decision rule
Combine heart rate, perfusion and response to oxygenation and ventilation.
Why the other regions do not fit
A and B precede effective chest expansion and call for correction of ventilation. C still requires care for poor perfusion but its rate is 68/min. D is the first displayed check meeting all specified compression criteria.
**Sources**
- Begin CPR in infants or children with heart rate below 60/min and poor perfusion despite adequate oxygenation and ventilation.

## Key concepts

- **Infant heart rate after ventilation support** — Combine heart rate, perfusion and response to oxygenation and ventilation.
- **Comparison with context** — A has a lower pulse than D but precedes effective ventilation; rate alone is insufficient.

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