<unk>  <unk>  is not necessarily a mode of mechanical ventilation though it may be referred to as such.<unk>  is a strategy (method or style) of ventilating the lungs in such a way that the amount of time the lungs are in inhalation is greater than the amount of time they are in exhalation, allowing for a constant inflation of the lungs, ensuring they remain "recruited" (meaning they participate in gas exchange and are not allowed to deflate to get stuck together or tighten up). The primary goal for<unk>  is improved oxygenation by forcing inspiratory time to be greater than expiratory time (example: inhale is 3 seconds and exhalation is 1 second, a 3:1 I:E<unk>  increasing the mean airway pressure and potentially improving oxygenation. Normal I:E<unk>  is 5:6, so forcing the I:E to be 2:1, 3:1, 4:1, (or even as high as 20:1) is the source of the term for the strategy.<unk>  has not often been shown to improve important clinical outcomes, such as mortality, duration of mechanical ventilation, or duration of ICU stay. This may be due to the fact that<unk>  is not considered as a mode early enough once ARDS is diagnosed. The preponderance of evidence suggests that<unk>  improves oxygenation, although the evidence is weak and characterized by low quality, conflicting studies.
Inverse ratio ventilation
Collateral ventilation
High-frequency ventilation
Open lung ventilation
Volume-controlled ventilation
Pressure support ventilation
Prone ventilation
Pressure-controlled ventilation