Evaluation of the Efficacy of Surfaktant in Preterm Infants by Lung Ultrasound

Outcomes: Improvement of Lung usg scores after surfactanct and the difference between groups at different time points (2nd and 6hr). Secondary outcome: The correlation between lung usg scores and clinical scores (silverman scores), FiO2 and PCO2 levels, failure of weaning to noninvasive ventilation after surfactant Preterm infants of 32 gestational weeks and below, who admit to the NICU with signs of respiratory distress, treated with non invasive or mechanical ventilation and require surfactant treatment in 6 hours of life will be enrolled.