# Stage 2 — Analyze cues. Complete the analysis by selecting the option that best fits each blank.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=617249&lang=en  
> language: en  
> subject: Pathophysiology  
> category: PA

## Question

Stage 2 — Analyze cues. Complete the analysis by selecting the option that best fits each blank.

Twelve hours after admission for leg and back pain, a 10-year-old with sickle cell disease has a temperature of 38.7 C, cough, chest pain, RR 32/min, and SpO2 89% on room air (97% at admission). The chest radiograph shows a new right lower-lobe infiltrate. Hemoglobin is 6.9 g/dL (baseline 8.4 g/dL) with an elevated reticulocyte count, and the child has become increasingly drowsy after repeated opioid doses. The respiratory findings are best explained by ::선택::vaso-occlusive chest-wall pain causing shallow breathingacute chest syndromeopioid-related hypoventilation without a new lung process. The hemoglobin pattern most likely reflects ::선택::accelerated hemolysis and sequestration of sickled cells in the lungtransient red-cell aplasia from parvovirus B19 infectiondilution from the intravenous fluid given since admission. The drowsiness matters most now because ::선택::the pain crisis is easing and the child is catching up on lost sleepadequate analgesia has been reached and opioids should be stopped entirelyfurther opioid doses can deepen hypoventilation of the right lung base. The temperature of 38.7 C is best interpreted as ::선택::inflammation from vaso-occlusion that does not change antibiotic timinga possible invasive bacterial infection in a child with impaired splenic functiona response to dehydration that should settle with intravenous fluid.

## Explanation

In sickle cell disease, a new infiltrate with fever and respiratory findings is acute chest syndrome; chest-wall vaso-occlusion or opioid hypoventilation alone would not produce a new infiltrate with fever. A hemoglobin fall with a persistently elevated reticulocyte count indicates increased destruction and sequestration rather than aplasia, and new drowsiness after repeated opioid doses in a hypoxemic child is sedation that can deepen hypoventilation, not restorative sleep. Functional asplenia makes a temperature of 38.7 C a possible invasive bacterial infection rather than simple inflammation or dehydration.

## In-depth explanation

Quick answer
Acute chest syndrome; hemolysis and pulmonary sequestration; further opioids can deepen right-base hypoventilation; possible invasive bacterial infection.

Why this is correct
The defining combination is a new infiltrate plus fever, chest pain, or respiratory signs in a child with sickle cell disease. Chest-wall vaso-occlusion and opioid hypoventilation both cause shallow breathing and can trigger the syndrome, but neither explains a new infiltrate with fever; together these findings are acute chest syndrome. Parvovirus aplastic crisis lowers the reticulocyte count; here it stays elevated, so the marrow is responding to increased destruction. Drowsiness that increases after each opioid dose while saturation falls is sedation, and further doses reduce tidal volume and sigh breaths, worsening the right-base hypoventilation that drives sickling in the lung; pain still needs treatment, but with reassessment and nonopioid components. Autosplenectomy leaves the child vulnerable to pneumococcus and other encapsulated organisms, so a temperature of 38.7 C is treated as possible bacteremia.

Easy analogy or mental picture
Picture the right lung base as a narrow alley: shallow breathing from pain or sedation lets deoxygenated sickled cells jam the alley, and every jam makes the next one more likely.

Memory hook
"Infiltrate + SCD = ACS"; "Retics up = destruction, retics down = aplasia."

NCLEX decision rule
In sickle cell disease, interpret each cue through the disease: a lung infiltrate is acute chest syndrome, anemia is judged against the child's own baseline and reticulocyte response, and fever means possible sepsis.

Why the other choices are wrong
Chest-wall vaso-occlusion is tempting because the child was admitted for a pain crisis and is splinting, and opioid hypoventilation is tempting because the child is drowsy; both are triggers, but neither accounts for a new infiltrate with fever and an 8-point fall in saturation. Parvovirus aplasia is a real sickle cell crisis, but it causes reticulocytopenia. Hemodilution cannot account for an 18% hemoglobin fall with only cautious fluid. Catch-up sleep after pain eases is tempting, but the drowsiness tracks the opioid doses and coincides with hypoxemia. Stopping opioids entirely is wrong because uncontrolled pain worsens splinting. Low-grade fever does occur with vaso-occlusion and poor intake, which makes those options tempting, but 38.7 C in a functionally asplenic child is treated as possible bacteremia.

References
1NHLBI: Evidence-Based Management of Sickle Cell Disease (Expert Panel Report)Acute chest syndrome definition, oxygen, antibiotics, incentive spirometry, cautious fluids, transfusion; fever as an emergency in SCD
2CDC: Sickle Cell DiseaseComplications of SCD including acute chest syndrome, infection risk, and anemia

## Clinical scenario

Case update
The nurse interprets the new respiratory findings, the hemoglobin change, the fever, and the sedation after repeated opioid doses.

## Key concepts

- **Acute chest syndrome** — A new pulmonary infiltrate with fever or respiratory findings in sickle cell disease, often triggered by infection, infarction, or hypoventilation.
- **Reticulocyte count** — A measure of new red-cell production that stays high with hemolysis and falls in aplastic crisis.
- **Functional asplenia** — Loss of splenic immune function from repeated infarction that raises the risk of overwhelming infection by encapsulated bacteria.

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