The normal inspiratory to expiratory ratio (I:E ratio) is 1:2. In patients with obstructive airway disease, the target I:E ratio should be 1:3 to 1:4.

What is the difference between PEEP and auto-PEEP?

The difference between PEEPtot and PEEPe corresponds with the intrinsic PEEP (PEEPi), and is also known as AutoPEEP (1). AutoPEEP may also be referred to as air-trapping, breath stacking, dynamic hyperinflation, inadvertent PEEP, or occult PEEP.

What causes auto peeping?

Auto-PEEP occurs in patients receiving mechanical ventilation in the acute stage of acute respiratory failure when they have excessive minute ventilation, resulting in a relatively short expiratory time. This can be explained by the common phenomenon of a time constant in the exhalation phase.