Air bronchogram in X-ray is seen in the case of:

ESIC Nursing Officer -2019 (Shift -1)

Medical & Surgical Nursing

Medium

Appeared in: ESIC Nursing Officer -2019 (Shift -1)

Explanation

An air bronchogram is the radiological sign of air-filled bronchi being visible against a background of opacified (fluid-filled or collapsed) alveoli.
In Respiratory Distress Syndrome (RDS), especially in neonates, a deficiency of surfactant leads to widespread alveolar collapse (atelectasis).
This alveolar collapse makes the lung tissue opaque on an X-ray, creating a stark contrast with the patent, air-filled bronchi, resulting in a classic air bronchogram sign.
The image provided is a textbook example of a neonatal chest X-ray in RDS, showing diffuse ground-glass opacities and clear air bronchograms.

Option A: Sepsis is a systemic inflammatory response to infection. It does not directly cause the alveolar consolidation required to produce an air bronchogram. The lungs may be clear on X-ray initially.
Option C: The characteristic X-ray findings for primary or reactivation tuberculosis are typically upper lobe infiltrates, cavitations, Ghon complex, or hilar lymphadenopathy. While consolidation can occur, diffuse air bronchograms are not a classic or common feature.
Option D: Bronchial asthma is an obstructive airway disease. The pathophysiology involves bronchoconstriction and inflammation, leading to air trapping. The typical X-ray findings are hyperinflation (darker, larger lungs) and bronchial wall thickening, not alveolar opacification.

Visual 1: Annotated X-ray - An annotated version of the provided chest X-ray, highlighting the diffuse 'ground-glass' opacities and clearly pointing out the branching, dark lines of the air bronchograms.
Visual 2: Diagram - A schematic diagram comparing a healthy alveolus with one from a patient with RDS. The diagram would show the RDS alveolus as collapsed around a patent bronchus, illustrating how an air bronchogram is formed.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Interpretation of radiological signs in respiratory diseases, specifically the air bronchogram as background academic context rather than a clinical decision trigger.
Recognizing air bronchograms on a neonatal chest X-ray is a critical skill for the early diagnosis and management of Respiratory Distress Syndrome (RDS).
Prompt identification allows for timely administration of surfactant replacement therapy and initiation of respiratory support (like CPAP or mechanical ventilation), which significantly improves outcomes for preterm infants.
What if? If the X-ray showed hyperinflated lungs with flattened diaphragms and no air bronchograms, the most likely diagnosis would be related to air trapping, such as meconium aspiration syndrome in a neonate or an asthma exacerbation in an older child.

How to Approach the Question

Step 1: Identify the key finding in the question and the associated image. The question asks about 'air bronchogram,' and the image shows dark, branching airways against a white, opaque lung field.
Step 2: Understand the pathophysiology of the finding. An air bronchogram signifies that the alveoli (air sacs) are filled with fluid or are collapsed, while the bronchi (airways) remain open and filled with air.
Step 3: Evaluate each option based on this pathophysiology. Consider which of the listed conditions causes widespread alveolar filling or collapse.
Step 4: Systematically eliminate the options that do not fit. Bronchial asthma causes air trapping (hyperinflation), not consolidation. Sepsis is a systemic condition and doesn't directly cause this lung finding. Tuberculosis has different characteristic patterns.
Step 5: Select the option that directly and classically causes the described sign. Respiratory Distress Syndrome, due to surfactant deficiency and alveolar collapse, is the textbook cause of air bronchograms.

Concept Tested & Keywords

Concept Tested: Interpretation of radiological signs in respiratory diseases, specifically the air bronchogram.
Stem keywords: Air bronchogram, X-ray
Lead-in keywords: seen in the case of
Clinical cues: The provided image of a neonatal chest X-ray is a strong clue, as it shows classic features of Neonatal RDS.

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