# A nurse is assessing a 6-year-old child with cystic fibrosis who has been admitted for pulmonary exacerbation. Which assessment finding would be most indicative of advanced pulmonary involvement in this child?

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> subject: Child Health

## 문제

A nurse is assessing a 6-year-old child with cystic fibrosis who has been admitted for pulmonary exacerbation. Which assessment finding would be most indicative of advanced pulmonary involvement in this child?

The nurse is conducting a comprehensive respiratory assessment on a pediatric patient with cystic fibrosis.

## 보기

1. Productive cough with thick, purulent sputum
2. Decreased exercise tolerance and fatigue
3. Wheezing and crackles on auscultation
4. Digital clubbing and barrel chest configuration **✔ 정답**

**정답: 4**

## 해설

Digital clubbing and barrel chest indicate chronic hypoxemia and advanced, irreversible lung damage in cystic fibrosis. Other findings like productive cough or wheezing are common but less specific for advanced disease.

## 심화 해설

Understanding Cystic Fibrosis Pulmonary Progression

Cystic fibrosis (CF) is a progressive, autosomal recessive disease caused by dysfunction of the CF transmembrane conductance regulator (CFTR) protein, which impairs chloride ion transport across cell membranes [4]. This defect leads to the production of thick, sticky mucus that obstructs the airways, providing a medium for chronic bacterial colonization and persistent inflammation. In the pediatric population, pulmonary exacerbations are critical events that accelerate the decline in lung function over time. When assessing a child for advanced pulmonary involvement, the nurse must distinguish between findings that reflect an acute-on-chronic infection and those that signal irreversible structural damage to the lung parenchyma and thoracic cage.

The assessment findings in the options represent a clinical spectrum. A productive cough with thick, purulent sputum (Option 1) is a hallmark of CF lung disease and indicates active infection and mucus plugging, but it is present even in mild to moderate disease. Similarly, wheezing and crackles on auscultation (Option 3) are common findings during an acute exacerbation due to airway narrowing and mucus in the airways. Decreased exercise tolerance and fatigue (Option 2) suggest a worsening clinical status and potential hypoxemia, but these symptoms can fluctuate significantly during acute illness and improve with treatment of the exacerbation.

In contrast, digital clubbing and a barrel chest configuration (Option 4) are physical signs of chronic, long-standing tissue hypoxia and structural remodeling. Digital clubbing, the bulbous enlargement of the distal phalanges, results from chronic hypoxemia and the shunting of blood through precapillary arteriovenous anastomoses. A barrel chest, characterized by an increased anteroposterior diameter of the thorax, develops over years due to chronic air trapping, hyperinflation, and the loss of elastic recoil in the lung tissue. These two findings are not reversible with standard antibiotic or mucolytic therapy for an acute exacerbation; they are physical manifestations of advanced, destructive lung disease. While the provided real-world evidence focuses on the impact of CFTR modulators like elexacaftor/tezacaftor/ivacaftor (ETI) on lung function metrics such as percent predicted forced expiratory volume in 1 second (ppFEV₁) , the underlying pathology that these drugs aim to halt is precisely the progressive structural damage that culminates in the clinical findings of clubbing and barrel chest. Therefore, in a 6-year-old child, the presence of these signs is the most specific indicator of advanced, irreversible pulmonary involvement.

References (research sources)

- [4]Cystic Fibrosis With No Known Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) Mutation and a Negative Newborn Screening Test: A Case Report.Case reportSubbanna R, Martin K. (2026) · DOI: 10.7759/cureus.108603

## 임상 시나리오

Clinical Case: Recognizing Advanced CF Lung Disease

**Scenario:** A 6-year-old with cystic fibrosis is admitted for a pulmonary exacerbation. The nurse notes a productive cough, diffuse wheezing, and an oxygen saturation of 91% on room air. The child appears fatigued but is able to speak in full sentences.

Assessment Findings

- **Inspection:** Increased anterior-posterior chest diameter (barrel chest), clubbing of the fingernails.

- **Palpation:** Decreased tactile fremitus.

- **Percussion:** Hyperresonance throughout all lung fields.

- **Auscultation:** Coarse crackles and expiratory wheezes bilaterally.

Clinical Reasoning

While the productive cough, wheezing, and fatigue are consistent with an acute exacerbation, the presence of **digital clubbing and a barrel chest configuration** indicates long-standing, irreversible structural changes. These findings are hallmarks of advanced pulmonary involvement, resulting from chronic hypoxia and air trapping. They help the nurse differentiate an acute-on-chronic episode from early-stage disease.

Nursing Priorities

- Administer prescribed antibiotics and airway clearance therapies to manage the acute exacerbation.

- Continuously monitor respiratory status, including work of breathing and oxygen saturation.

- Educate the family that clubbing and barrel chest are signs of disease progression, reinforcing the importance of treatment adherence to slow further decline.

- Coordinate with respiratory therapy and nutrition services to optimize long-term management.

## 핵심 개념

- **Digital Clubbing** — Bulbous enlargement of the distal phalanges of the fingers and toes, resulting from chronic tissue hypoxia and associated with advanced pulmonary disease.
- **Barrel Chest** — An increased anterior-posterior diameter of the chest wall, caused by chronic air trapping and hyperinflation of the lungs, often seen in advanced obstructive lung diseases like CF.
- **Cystic Fibrosis Transmembrane Conductance Regulator (CFTR)** — A protein responsible for chloride ion transport across cell membranes; its dysfunction in CF leads to thick, sticky mucus production in the lungs and other organs.
- **Pulmonary Exacerbation** — An acute worsening of respiratory symptoms in chronic lung disease, often triggered by infection, leading to increased cough, sputum production, and decline in lung function.
- **Autosomal Recessive** — A pattern of genetic inheritance where two copies of an abnormal gene must be present for the disease to develop, as seen in cystic fibrosis.

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