Pulmonary Aeration and Muscle Thickening Fraction: Association of Electrical Impedance Tomography and Ultrasound

Four different randomized flow rates will be used for evaluation: 2.0 liter.Kg-1.min-1, 1.5 liter.Kg-1.min-1, 1.0 liter.Kg-1.min-1, 0.5 liter.Kg-1.min-1. At the end of the randomized order evaluation the infant will remain in the flow of 0.5 liter.Kg-1.min-1 for 5 minutes and then return to the flow of 2.0 liter.Kg-1.min-1. The EIT parameters, ultrasound assessment, and clinical variables will be collected at the end of the 5-minute stay in each lane.