The objective of this randomized, double-blind trial is to compare the efficacy and safety of 2 therapeutic regimens of fentanyl administration in a population of preterm newborns of GA \<= 32 weeks in MV: * Group A) continuous infusion of Fentanyl + open label boluses of Fentanyl; * Group B) continuous infusion of placebo + open label boluses of Fentanyl.
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The primary efficacy variable for this study will be the pain scores obtained during the study period. Procedural pain will be measured once a day by the PIPP scale. Chronic pain will be evaluated through the application of the EDIN scale 3 times a day.
Timeframe: 7 days