USMLE Step 1 Respiratory Physiology Review 60 04 Pneumothorax

USMLE Step 1 Respiratory Physiology Review 60 04 Pneumothorax

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Play USMLE Audio MP3 60 04 Pneumothorax Below

Begin 60 04 Pneumothorax Transcription

 Now we are going to discuss the pneumothorax. 

  Is a pneumothorax usually unilateral or bilateral? In other words does it usually happen to one or both lungs?     

  • Normally, a pneumothorax is unilateral.

Why is this?

  • Because there is no communication between the pleural sacs.

 When air leaks into the pleural space what happens to the adhesive bond that holds the visceral pleura and the parietal pleura together?

  • The adhesive bond is broken and the two pleural layers become unstuck.

 And what happens to the lung when the bond is broken?

  • The lung will collapse either partially or totally.

 Various things can cause a pneumothorax to occur.  What are two things that can happen to a lung that will allow air to enter the pleural space?

  • When a lung ruptures or is lacerated, air will enter the pleural space.

 What injury to the thorax causes pneumothorax?

  • Penetration of the thorax.

 Finally, what can happen to the esophagus that would cause an air leak?

  • A pneumothorax can also be caused by a rupture of the esophagus.

 What is the normal treatment for pneumothorax? The two word answer starts with N-A.

  •  Needle Aspiration

 Student doctor please pause the tape and summarize what we have just discussed about pneumothorax.

  •  Because there is no communication between the pleural sacs, a pneumothorax is usually unilateral, which means it only happens to one lung. When air leaks into the pleural space, the adhesive bond is broken and the two pleural layers become unstuck. When this happens, the lung collapses either partially or totally. Various things can cause a pneumothorax to occur.  For instance, air will enter the pleural space when a lung ruptures or is lacerated. Penetration of the thorax is another cause of pneumothorax. Finally, rupture of the esophagus is also a cause of pneumothorax. Normal treatment for pneumothorax is needle aspiration.

****END OF TRANSCRIPTION****

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