Tension Pneumothorax: Critical Air Accumulation
The condition described is a severe form of pneumothorax where air enters the pleural space but cannot exit, creating a one-way valve effect. This leads to a progressive build-up of positive pressure within the affected hemithorax.
Pathophysiology and Key Features
- Positive Pressure Build-up: Air trapped in the pleural space increases intrathoracic pressure.
- Lung Collapse: The elevated pressure compresses the ipsilateral lung, causing it to collapse.
- Mediastinal Shift: The positive pressure pushes the mediastinum (including the heart and trachea) towards the unaffected (contralateral) side.
- Diaphragm Flattening: Increased intrathoracic pressure can also cause the diaphragm to flatten.
- Compromised Venous Return: The mediastinal shift compresses the great veins (superior and inferior vena cava), significantly reducing the return of blood to the right side of the heart, leading to decreased cardiac output and potential cardiovascular collapse.
This specific set of features, particularly the positive pressure mechanism and subsequent hemodynamic compromise, defines a tension pneumothorax.
Differential Diagnosis Summary
| Condition | Key Characteristics |
| Primary Spontaneous Pneumothorax | Occurs spontaneously, often in tall, thin young men, without underlying lung disease. |
| Secondary Spontaneous Pneumothorax | Occurs in patients with pre-existing lung disease (e.g., COPD, asthma). |
| Haemo-pneumothorax | Presence of both blood (haemo-) and air (pneumo-) in the pleural space, often due to trauma. |
| Tension Pneumothorax | Life-threatening; positive pressure, lung collapse, mediastinal shift, hemodynamic compromise due to trapped air. |
The question details the progressive, high-pressure state characteristic of tension pneumothorax, distinguishing it from other types.
Important Questions from Chest & Lung Surgery
- A 50 year old male presented with pain along the left arm and ptosis. His chest X-ray showed soft tissue opacity at the apex of the left lung along with the erosion of the adjacent rib. The probable diagnosis is:
- Which of the following are the Indications for lung transplantation?
1. Emphysema
2. Primary pulmonary hypertension
3. Obliterative bronchiolitis
Select the correct answer using the code given below: - A patient of road traffic accident presents to the emergency with increasing restlessness and difficulty in breathing. The respiratory rate is 26 breaths/minute; there are distended neck veins; trachea is deviated to the right side with hyper-resonant note and absence of breath sounds on the left side. Which of the following statements are correct?
1. The most probable clinical diagno-sis is left tension pneumothorax
2. Immediate chest decompression using wide bore cannula in left second intercostal space should be done
3. Immediate chest X-ray should be done to confirm the clinical diagnosis
4. Definitive chest tube insertion in left fifth intercostal space should be done
Select the correct answer using the code given below : Which of the following are correct for herniation via foramen of Morgagni?
1. It occurs posteriorly in chest.
2. Transverse colon is the commonest content.
3. Defect is between sternal and costal attachments.
4. It is a type of congenital hernia.
Select the answer using the code given below.
- Which of the following are correct with regard to lung cancer?
1. Surgical resection has a limited role in curative treatment of lung cancer.
2. Pattern of disease and prognosis of oat cell carcinoma are different to other varieties in the lungs.
3. Small cell lung cancer is a type of Neuroendocrine Tumour (NET).
4. Squamous cancer appears as a cavitating tumour in the lungs.
Select the correct answer using the code given below.
