Atelectotrauma

Atelectasis occurs when distending pressure of the alveolus is overcome by surface tension of fluid within the alveolus. Repeated atelectasis and re-inflation leads to atelectotrauma.

Atelectotrauma, atelectrauma, cyclic atelectasis or repeated alveolar collapse and expansion (RACE) are medical terms for the damage caused to the lung by mechanical ventilation under certain conditions. When parts of the lung collapse at the end of expiration, due to a combination of a diseased lung state and a low functional residual capacity, then reopen again on inspiration, this repeated collapsing and reopening causes shear stress which has a damaging effect on the alveolus.[1][2] Clinicians attempt to reduce atelectotrauma by ensuring adequate positive end-expiratory pressure (PEEP) to maintain the alveoli open in expiration. This is known as open lung ventilation. High frequency oscillatory ventilation (HFOV) with its use of 'super CPAP' is especially effective in preventing atelectotrauma since it maintains a very high mean airway pressure (MAP), equivalent to a very high PEEP. Atelectotrauma is one of several means by which mechanical ventilation may damage the lungs leading to ventilator-associated lung injury. The other means are volutrauma, barotrauma, rheotrauma and biotrauma. Attempts have been made to combine these factors in an all encompassing term: mechanical power.

References

  1. ^ Shi C., Boehme S., Hartmann E. K., Markstaller K. Novel technologies to detect atelectotrauma in the injured lung. Exp Lung Res. 2011 Feb;37(1):18-25. PMID 20860539 [1]
  2. ^ Attar MA, Donn SM. Mechanisms of ventilator-induced lung injury in premature infants. Semin Neonatol. 2002 Oct;7(5):353-60. PMID 12464497 [2]
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