# Stage 6 — Evaluate outcomes. Review the respiratory trend and answer both questions.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=568857&lang=en  
> language: en  
> subject: Physiological Adaptation  
> category: PA

## Question

Stage 6 — Evaluate outcomes. Review the respiratory trend and answer both questions.

| Time | Data |
| --- | --- |
| 12 hours after admission | SpO2 89% room air; RR 32; one right lower-lobe infiltrate; hemoglobin 6.9 |
| 1 hour | SpO2 94% on 2 L/min oxygen; awake spirometry started; antibiotics administered |
| 3 hours | SpO2 89% on 4 L/min oxygen; RR 38; increasing retractions; hemoglobin 6.2 |
| 4 hours | SpO2 87% despite increased oxygen; bilateral infiltrates; child is fatigued |

Q1. Which interpretation is best supported by the four-hour trend?

The child is improving because antibiotics were given
The findings represent expected opioid sleep
Acute chest syndrome is progressing to severe respiratory compromise
The low saturation is explained by chronic anemia alone

Q2. Which response is now the priority?

Escalate to critical care and hematology for urgent exchange-transfusion management
Wait for the next scheduled chest radiograph
Discontinue oxygen to obtain a new baseline
Encourage oral fluids as the only intervention

## Explanation

Persistent saturation below 90% despite oxygen, increasing distress, progressive infiltrates, and further hemoglobin decline indicate severe progression rather than treatment success. These findings support urgent exchange-transfusion and critical-care escalation rather than waiting for another routine assessment.

## In-depth explanation

Quick answer
The child is worsening despite initial therapy and needs immediate severe-ACS escalation, including exchange-transfusion management.

Why this is correct
The combined direction of oxygen need, work of breathing, infiltrates, and hemoglobin is more important than any single value.

Easy analogy or mental picture
Four warning lights brighten together; one temporarily improved saturation does not cancel the worsening trend.

Memory hook
More oxygen, more infiltrate, less hemoglobin means escalate.

NCLEX decision rule
Evaluate response as a trajectory. When several respiratory markers worsen despite treatment, escalate before fatigue becomes failure.

Why the other choices are wrong
Waiting, removing oxygen, or relying on oral fluid ignores objective progression and delays definitive care.

References
1Common Acute Complications of Sickle Cell DiseaseAcute chest syndrome recognition, antibiotics, oxygen, spirometry, monitoring, and escalation
2ASH Sickle Cell Disease Guidelines: Transfusion SupportSimple versus exchange transfusion considerations in moderate and severe acute chest syndrome

## Clinical scenario

Case update
Initial oxygen, antibiotics, spirometry, cautious hydration, and analgesia were provided. The nurse evaluates the response over four hours.

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