Meconium Aspiration Syndrome (MAS)Created OnMay 6, 2020Last Updated OnMay 6, 2020byadmin You are here: Main Radiology Meconium Aspiration Syndrome (MAS) < All Topics Table of Contents Aspiration of meconium during intrapartum or intrauterine, usually in the setting of fetal distress, in term or post-term Rare in preterm but said to occur with congenital listeriosis (more likely to be pus) Major effects of MAS on lung function Airway blockage: Increased airway resistance with ball–valve mechanism and gas trapping. High risk of pneumothorax Chemical pneumonitis Increased risk of infection: Even though meconium is sterile. Escherichia coli is the most common infective agent Surfactant deficiency: Lipid content of meconium displaces surfactant from alveolar surface. Persistent pulmonary hypertension of the newborn Chest X-Ray Increased lung volumes Hyperinflated lungs with flattened hemidiaphragms Secondary to distal small airway obstruction and gas trapping Asymmetric patchy pulmonary opacities Due to subsegmental atelectasis Spontaneous pneumothorax or pneumomediastinum in 20-40% Due to increased alveolar tension from obstructed airways Multifocal consolidation Due to chemical pneumonitis Small pleural effusion may present *Some of the image photo is taken from web, we do not own this, it’s for knowledge sharing purpose.
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