Abstract
Objective To study the relationship between the lung ultrasonography and the chest X-ray and to study the value of lung ultrasonography score (LUS) in evaluating the effect of pulmonary surfactant (PS) on respiratory distress syndrome (RDS) of newborn. Method Preterm infants admitted to the neonatal intensive care unit of our Hospital from January 2016 to December 2017 and diagnosed with RDS were prospectively studied. LUS examinations were performed prior to, and within the first 6~12 hours after surfactant administration, chest X-rays were also performed at the same time so as to evaluate the effects of surfactant replacement therapy and the correlation between the lung ultrasonography and the chest X-rays. Lung ultrasonography findings at a total of six sites, with three sites in each lung were scored based on the presence of normal finding, the amount of B-lines and subpleural consolidations. Result A total of 45 preterm infants with RDS were enrolled. The cases of X-ray grades Ⅰ, Ⅱ, Ⅲ and Ⅳ before PS administration were 5 cases, 21 cases, 12 cases and 7 cases respectively. The scores of LUS 0~6, 7~12, 13~18 were 5 cases, 37 cases and 3 cases respectively, and the median of LUS was 10 points. Chest X-ray grades Ⅰ, Ⅱ, Ⅲ and Ⅳ within 6~12 hours after PS administration were 18 cases, 17 cases, 8 cases and 2 cases respectively. LUS of 0~6, 7~12, 13~18 were 21 cases, 20 cases and 4 cases respectively. The median of LUS after PS was 7 points. LUS after PS application was significantly lower than that before PS application (P<0.001). The LUS was positively correlated with the grades of X-ray before and after surfactant administration (before surfactant administration r=0.688, P<0.001, after surfactant administration r=0.777, P<0.001). Conclusion LUS is positively correlated with the grade of chest X-ray and might enable an early detection of the surfactant replacement therapy effects in RDS. Further studies are necessary to define the role of LUS in this field. Key words: Respiratory distress syndrome, newborn; Pulmonary surfactants; Ultrasonography; Lung ultrasonography score
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