The alveoli tend to collapse in patients with ARDS. Endotracheal aspiration may increase alveolar collapse by decreasing the end-expiratory lung volume. The hypothesis is that closed endotracheal aspiration led to less end-expiratory volume loss when compared to open endotracheal aspiration.
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End expiratory lung volume (EELV)
Timeframe: One minute before suctioning, 1, 10, 20, 30 minutes after suctioning