Which of the following is true regarding the physiology of an open pneumothorax?

Air cannot pass freely into the thoracic cavity through a chest wound.

The air is trapped when it enters the cavity.

Air moves in and out of a wound in the chest wall.

There are no audible sounds in an open pneumothorax.

Answer and Explanation

The Correct Answer is C

Choice A Reason:

Air cannot pass freely into the thoracic cavity through a chest wound is incorrect because air can indeed pass freely into the thoracic cavity through the chest wound in an open pneumothorax.

Choice B Reason:

The air is trapped when it enters the cavity is incorrect because the characteristic feature of an open pneumothorax is that air is not trapped; rather, it enters the thoracic cavity with each inhalation and exits with each exhalation through the chest wound.

Choice C Reason:

Air moves in and out of a wound in the chest wall is correct. In an open pneumothorax, also known as a "sucking chest wound," air can freely move in and out of the thoracic cavity through a wound in the chest wall. This occurs due to the creation of a communication pathway between the external environment and the pleural space, typically caused by a penetrating injury to the chest.

Choice D Reason:

There are no audible sounds in an open pneumothorax is incorrect because in an open pneumothorax, there may be audible sounds associated with the movement of air in and out of the wound, such as a sucking or bubbling sound, depending on the size and location of the wound. These sounds can be clinically significant and aid in the diagnosis of an open pneumothorax.

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Correct Answer is D

Explanation

Choice A Reason:

Bronchopneumonia is incorrect. Bronchopneumonia is characterized by patchy areas of consolidation involving multiple lobules scattered throughout the lungs. It typically results from bronchial obstruction and aspiration of infected material into the smaller airways and alveoli.

Choice B Reason:

Severe pneumonia is incorrect. "Severe pneumonia" is a broad term that can refer to pneumonia with various degrees of severity. It does not specifically describe the pattern of consolidation involving the entire lobe of the lung.

Choice C Reason:

Empyema is incorrect. Empyema refers to the accumulation of pus in the pleural cavity, often as a complication of pneumonia. It does not describe the pattern of consolidation within the lung tissue.

Choice D Reason:

Lobar pneumonia is correct. Lobar pneumonia is characterized by consolidation involving an entire lobe or lobes of the lung. It typically results from infection by a single pathogen, such as Streptococcus pneumoniae, which leads to inflammation and consolidation of an entire lobe of the lung.

A. COPD B. Sarcoidosis C. Lung cancer D. Cystic fibrosis

Correct Answer is A

Explanation

Choice A Reason:

COPD is a chronic lung condition characterized by airflow limitation that is not fully reversible. Individuals with COPD often have underlying structural lung changes, such as emphysematous bullae or blebs. These areas of weakened lung tissue are prone to rupture, leading to the development of pneumothorax. Additionally, the chronic inflammation and damage to the airways and lung parenchyma in COPD contribute to the development of pneumothorax.

Choice B Reason:

Sarcoidosis is incorrect. Sarcoidosis is a granulomatous disease that primarily affects the lungs and lymph nodes. While it can cause lung damage and lead to pneumothorax, it is less common than COPD as a comorbidity associated with SSP.

Choice C Reason:

Lung cancer is incorrect. Lung cancer can lead to pneumothorax, especially if the tumor erodes into the pleural space. However, SSP is more commonly associated with underlying lung diseases like COPD rather than lung cancer.

Choice D Reason:

Cystic fibrosis is incorrect. Cystic fibrosis is a genetic disorder characterized by abnormal mucus production and impaired clearance in various organs, including the lungs. While individuals with cystic fibrosis are at increased risk of pneumothorax due to underlying lung disease, SSP is less commonly seen in this population compared to COPD.

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Which of the following is true regarding the physiology of an open pneumothorax?

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