https://www.selleckchem.com/products/abr-238901.html of these diseases. Lung ultrasound (LUS) is a bedside technique that can be used on diagnosis and follow-up of neonatal respiratory diseases. However, there are rare reports on the ultrasound features of bronchopulmonary dysplasia (BPD) which is one of the most common chronic lung diseases in preterm infants. To describe the ultrasound features of different BPD levels, and to investigate the value of ultrasound in evaluating moderate-to-severe BPD. In this prospective cohort study, newborns of less than 37 weeks' gestational age in neonatal intensive care unit (NICU) were included. The LUS characteristics including pleural line, alveolar-interstitial syndrome (AIS), retrodiaphragmatic hyperechogenicity and diaphragmatic morphology were observed and recorded. The reliability of LUS in evaluating moderate and severe BPD were compared and calculated. A total of 108 infants were enrolled in our study 39, 24, 29, 16 infants had non, mild, moderate and severe BPD. The median(IQR) pleura thickness in the moderate-to-severe BPDng method in assessing the severity of BPD, especially in moderate and severe BPD. Depending on its unique advantages such as convenient, no radiation and repeatable, LUS is a valuable imaging method in assessing the severity of BPD, especially in moderate and severe BPD. It has previously been reported that chronic hypoxia increases blood viscosity. The increase is usually attributed to polycythemia-induced increases in hematocrit. However, the effect of acute hypoxia in humans on blood viscosity is unknown. Therefore, the purpose of this study was to determine the effect of acute hypoxia, independent of changes in hematocrit, on blood and plasma viscosity. Nine healthy volunteers breathed room air for 30 min, followed by 30 min of breathing 15% oxygen. Blood samples were collected at the end of both the normoxic and hypoxic conditions. Blood viscosity, plasma viscosity, and hematocrit were measure