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Acute lung injury (ALI) and Acute respiratory distress syndrome ...

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Mechanisms of ventilation induced<br />

<strong>lung</strong> <strong>injury</strong><br />

• Healthy animals developed <strong>lung</strong> <strong>injury</strong> if ventilated<br />

with PIP > 40 cm H 2 O “Barotrauma”<br />

– Kolobow Am Rev Resp Dis 135:312, 1987<br />

• Identical pressures did not cause <strong>injury</strong> if <strong>lung</strong><br />

expansion was restricted “Volutrauma”<br />

– Hern<strong>and</strong>ez J Appl Physiol 1989 66:2364<br />

• PEEP attenuated the <strong>injury</strong> of high pressure<br />

ventilation “Repetitive opening <strong>injury</strong>”<br />

– Webb Am Rev Resp Dis 1974; 110: 556

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