A college student is training for a marathon in the mountains. One day, she experiences a sharp pain and suddenly becomes short of breath. At the emergency room, chest x-ray reveals a spontaneous pneumothorax
The client asks the nurse to explain why this happened. The nurse states, "For unknown reasons, you lose intrapleural negative pressure.
A) You must have experienced a forced expiration against a closed glottis to cause the lung to deflate."
B) This means your lungs collapsed and expelled its air when you lose negative pressure."
C) You must have coughed too forcibly and your air sacs burst."
D) You must have a genetic anomaly causing weakened alveolar sacs to rupture."
Ans: B
Feedback:
The intrapleural pressure is always negative in relation to alveolar pressure in the normally inflated lung: approximately 4 mm Hg between breaths when the glottis is open and the alveolar spaces are open to the atmosphere. Although the intrapleural pressure of the inflated lung is always negative in relation to alveolar pressure, it may become positive in relation to atmospheric pressure. Although the intrapleural pressure of the inflated lung is always negative in relation to alveolar pressure, it may become positive in relation to atmospheric pressure (e.g., as during forced expiration and coughing). A spontaneous pneumothorax is a collapsed lung with loss of negative pressures.
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