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
- Left Internal Mammary Artery (LIMA) has become the conduit of choice for Left Anterior Descending (LAD) artery during coronary artery bypass grafting because:
- A 50-year old male with significant smoking history presented in the surgical emergency with sudden severe breathlessness. Chest X-ray shows right sided Pneumothorax. The appropriate management requires:
- During subclavian vein puncture in a surgical ward suddenly a patient developed severe breathlessness. On auscultation breath sound was absent and the ipsilateral chest was tympanitic on percussion. The probable diagnosis is:
- 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:
