Intubated preterm infants between 800-1200 grams and under 32 weeks of gestational age will start with PRVC ventilation mode, basal blood gases and work of breathing will measured. After that mode will shift to Bilevel Volume Guarantee mode for two hours than clinical and other parameters will be checked again. After this intervention, patients will allocated to PRVC or Bilevel VG group for remaining time.
The concept of mechanical power carries a number of limitations to define the risk of VILI (stress, strain and atelectrauma), for instance, it does not define the amount of energy applied to vulnerable lung tissue (specific power). The investigator's goal is to correlate the risk of VILI with its specific power.
To compare the duration of mechanical ventilation and the weaning period between two groups of patients managed with either Standard Care or with mechanical ventilation adjusted according to the Beacon Caresystem, in patients receiving mechanical ventilation for more than 24 hours