The Hip: Preservation, Replacement and Revision

Inverse I:E Ratio

- normally an inspiratory to expiratory time ratio (I/E) of 1:2 is used 
- inverse I/E is also utilized in ARDS to prevent barotrauma 
- long sustained inspiration reduces mean airway pressure while increasing the PaO2 for a given FiO2; 
- despite the benefits in gas exchange, the prolonged inspiratory duration relative to expiration is uncomfortable for the alert patient, and paralysis may be required; 
- if PIP are high, one way to reduce them is to reduce the inspiratory flow rate and prolong the inspiratory time (beware of auto PEEP
- intermittent positive pressure ventilation with inspiratory time longer than expiratory time (inverse ratio ventilation) has been successfully to treat infants with ARDS

Original Text by Clifford R. Wheeless, III, MD.

Last updated by Data Trace Staff on Thursday, September 8, 2011 3:13 pm