The presence of air or gas in the pleural cavity is termed as:

Appeared in: DSSSB 6 September 2024

Explanation

Pneumothorax is the specific medical term for the presence of air or gas in the pleural space, which is the area between the lung and the chest wall.
The term is derived from its Greek roots: 'pneumo-' refers to air, and 'thorax' refers to the chest.
This accumulation of air disrupts the negative pressure that keeps the lungs inflated, leading to partial or complete lung collapse and respiratory distress.

Option A: Haemothorax refers to the accumulation of blood in the pleural cavity, not air. The prefix 'haemo-' means blood.
Option B: Chylothorax is the accumulation of chyle, a milky lymphatic fluid, in the pleural space. It is not a collection of air.
Option C: Pyothorax, also known as empyema, is the accumulation of pus in the pleural cavity. The prefix 'pyo-' refers to pus.

Clinical Relevance

Nursing practice connection: Knowing Terminology for Abnormal Collections in the Pleural Cavity helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Accurately identifying the substance in the pleural space is critical for determining the correct treatment. A pneumothorax requires evacuating air with a chest tube, whereas a pyothorax requires drainage and antibiotics, and a large haemothorax may necessitate surgery.
A tension pneumothorax is a medical emergency where air accumulates under pressure, causing a mediastinal shift that compromises both respiratory and cardiac function. Nurses must recognize signs like tracheal deviation, severe dyspnea, and hypotension for immediate intervention.
What if? If a patient's chest X-ray showed a complete 'white-out' of one lung field with dullness to percussion, the diagnosis would more likely be a massive pleural effusion (like haemothorax or hydrothorax) rather than a pneumothorax, which typically presents with hyper-resonance to percussion.

How to Approach the Question

First, identify the key phrase in the question stem: 'presence of air or gas in the pleural cavity'.
Next, break down the medical terms in the options into their root words and prefixes.
Analyze the prefixes: 'Haemo-' relates to blood, 'Chylo-' relates to chyle (lymphatic fluid), 'Pyo-' relates to pus, and 'Pneumo-' relates to air.
Match the prefix for 'air' ('Pneumo-') with the condition described in the question.
This direct word-part analysis confirms that Pneumothorax is the only correct answer for a collection of air in the chest.

Concept Tested & Keywords

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E6 Pathology-Textbook of PATHOLOGYHarsh Mohan Part 2 (215-514) p. 77-79

E6 Nursing Brunner Adult Health 3SA Vol 1 Part 2 p. 24-26

Practise the full DSSSB 6 September 2024

Attempt every question from this paper in a timed mock, then review the full solution for each one.