What are the dangers of rapid ascent during flight for critically ill patients?

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Rapid ascent during flight can pose significant dangers for critically ill patients, particularly concerning barotrauma and exacerbation of pneumothorax. As altitude increases, the decrease in atmospheric pressure can lead to the expansion of gas-filled spaces within the body, such as in the lungs or any pre-existing pleural space containing air, as seen in pneumothorax.

Barotrauma occurs when there is a pressure imbalance between the external environment and the gas in these spaces. For patients who have an existing pneumothorax, the fast change in pressure can cause the air in the pleural cavity to expand, potentially leading to worsening of the pneumothorax, which could collapse the lung or create other severe respiratory complications.

This risk is particularly critical in a transport setting, where patients are often already managing underlying conditions that compromise their respiratory function. Ensuring controlled ascent rates and monitoring for signs of respiratory distress are essential practices to mitigate these dangers during flight.