Haemothorax occurs in?

Appeared in: RUHS, Jaipur, PB B.Sc Nursing Entrance-2021

Explanation

Haemothorax is defined as the accumulation of blood in the pleural cavity or space.
The pleural space is the potential space located between the visceral pleura (which covers the lung surface) and the parietal pleura (which lines the inner chest wall).
Normally, this space contains only a small amount of serous fluid (less than 15 mL) to lubricate lung movement.
Trauma, surgery, or rupture of a blood vessel can cause bleeding into this space, leading to a haemothorax.
The image correctly visualizes blood filling the pleural space and compressing the adjacent lung.

Option B: The thoracic cavity is the entire chest cavity, which includes the lungs, heart, mediastinum, and the pleural spaces. While a haemothorax is located within the thoracic cavity, this answer is too general. The term 'pleural space' is the specific anatomical location.
Option C: The peritoneal space (or cavity) is located within the abdomen, enclosed by the peritoneum. A collection of blood in this space is called a haemoperitoneum, not a haemothorax.
Option D: The periosteum is a dense layer of vascular connective tissue that envelops the bones. Bleeding under this membrane is known as a subperiosteal haematoma.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomical location of haemothorax as background academic context rather than a clinical decision trigger.
A massive haemothorax (greater than 1500 mL of blood) is a life-threatening emergency that can lead to hypovolemic shock and respiratory failure.
Nurses play a critical role in managing patients with haemothorax by monitoring vital signs for signs of shock (tachycardia, hypotension), assessing respiratory status (breath sounds, oxygen saturation), and managing chest tube drainage systems.
What if? If the fluid collected was milky white instead of blood, the condition would likely be a chylothorax, caused by disruption of the thoracic duct, and management would focus on reducing chyle flow (e.g., dietary changes, octreotide) in addition to drainage.

How to Approach the Question

First, identify the key term in the question: 'Haemothorax'.
Break down the term: 'Haemo-' refers to blood, and '-thorax' refers to the chest.
Recall the basic anatomy of the chest. The lungs are enclosed in a two-layered membrane called the pleura, and the space between these layers is the pleural space.
Evaluate the options based on this anatomical knowledge. 'Pleural space' is the specific cavity surrounding the lungs.
Eliminate the other options: 'Thoracic cavity' is too broad, 'Peritoneal space' is in the abdomen, and 'Periosteum' relates to bone.
Confirm the definition: Haemothorax is specifically the collection of blood in the pleural space.

Concept Tested & Keywords

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

E6 Medicine Harrison 22e Part 2 p. 174-176

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