# Stage 3 — Prioritize hypotheses. On arrival the child sat forward, spoke one or two words at a time, and had heart rate 132/min, respiratory rate 38/min, SpO2 88% on room air, and peak expiratory flow 30% of personal best. Temperature was 37.0°C and blood pressure 108/68 mm Hg. After the initial bronchodilator treatments, heart rate is 136/min, SpO2 is 89% to 90% on oxygen, peak flow on the last attempt was 32% of personal best, air movement is minimal with only faint wheeze bilaterally, and the child is increasingly drowsy. There is no rash or lip swelling, no known allergen exposure, and no choking episode before symptoms began. Complete the diagram by selecting the condition the client is most likely experiencing, 2 actions the nurse should take to address that condition, and 2 parameters the nurse should monitor to assess the client's progress.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=617357&lang=en  
> language: en  
> subject: Medical Emergencies  
> category: PA

## Question

Stage 3 — Prioritize hypotheses. On arrival the child sat forward, spoke one or two words at a time, and had heart rate 132/min, respiratory rate 38/min, SpO2 88% on room air, and peak expiratory flow 30% of personal best. Temperature was 37.0°C and blood pressure 108/68 mm Hg. After the initial bronchodilator treatments, heart rate is 136/min, SpO2 is 89% to 90% on oxygen, peak flow on the last attempt was 32% of personal best, air movement is minimal with only faint wheeze bilaterally, and the child is increasingly drowsy. There is no rash or lip swelling, no known allergen exposure, and no choking episode before symptoms began. Complete the diagram by selecting the condition the client is most likely experiencing, 2 actions the nurse should take to address that condition, and 2 parameters the nurse should monitor to assess the client's progress.

Condition

Select 1
Severe asthma improving with bronchodilators
Anaphylaxis with lower-airway bronchospasm
Impending respiratory failure from severe asthma
Lower-airway foreign-body obstruction

Actions to take

Select 2
Administer IM epinephrine into the lateral thigh
Request immediate pediatric critical-care evaluation
Obtain a repeat peak expiratory flow measurement at the bedside
Prepare to assist ventilation with a bag-mask
Prepare the child for urgent bronchoscopy

Parameters to monitor

Select 2
Serum potassium level
PaCO2 on blood gas
Serum mast-cell tryptase level
Level of consciousness
Heart rate and rhythm

## Explanation

Worsening drowsiness with a nearly silent chest after bronchodilators means the child is tiring and retaining carbon dioxide, not improving. The priority is immediate critical-care escalation and readiness to assist ventilation. Level of consciousness and PaCO2 show whether ventilatory failure is progressing; tachycardia and potassium mainly reflect albuterol effects.

## In-depth explanation

Quick answer
Impending respiratory failure from severe asthma; request immediate pediatric critical care and prepare bag-mask ventilation; monitor level of consciousness and PaCO2.

Why this is correct
A quieter chest with less wheeze would look like improvement, but it is paired with minimal air movement, falling alertness, and SpO2 of only 89% to 90% on oxygen. That combination means airflow is critically reduced and the child is tiring. Ventilatory failure is identified by rising PaCO2 and declining consciousness, so those are the parameters that track it.

Easy analogy or mental picture
Think of a runner who stops panting loudly — not because the race is over, but because the runner is collapsing.

Memory hook
Silent chest + sleepy child = Stop and Summon: call critical care, get the bag-mask ready.

NCLEX decision rule
In asthma, a decrease in wheeze counts as improvement only when air movement, alertness, and oxygenation also improve; otherwise treat it as impending respiratory failure.

Why the other choices are wrong
"Improving with bronchodilators" is the classic trap: less wheeze here reflects less airflow. Anaphylaxis would bring rash, swelling, or an exposure, so IM epinephrine and tryptase target the wrong diagnosis. Foreign-body obstruction usually follows a choking episode and gives unilateral findings, so bronchoscopy is not indicated. Peak flow was already 32% of personal best; repeating it adds no decision-changing data, a drowsy child cannot perform it reliably, and it delays escalation. Heart rate and potassium change with albuterol and do not measure ventilatory fatigue.

References
1GINA reports: Global Strategy for Asthma Management and PreventionDrowsiness and a silent chest signal life-threatening asthma requiring ICU transfer and airway support
2NHLBI — Asthma attacksWarning signs of a severe asthma attack that needs emergency care

## Clinical scenario

Case update
After initial bronchodilator treatments, SpO2 is 89% to 90% on oxygen, air movement is minimal, and the child is increasingly drowsy.

## Key concepts

- **Silent chest** — Near-absent breath sounds from severely limited airflow, an ominous asthma sign.
- **Ventilatory failure** — Inability to remove carbon dioxide, shown by rising PaCO2 and decreasing alertness.
- **Peak expiratory flow** — Effort-dependent measure of airflow that is unreliable in a drowsy child.

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