ObjectiveTo explore the value of lung ultrasound score in predicting weaning success in patients withsevere respiratory support.MethodsA total of 86 patients with severe respiratory support were selected

and they were dividedinto successful weaning group with 64 cases and weaning failure group with 22 cases according to the results of weaning. Thegeneral information

lung ultrasound score

oxygen partial pressure（Pa O2）

oxygenation index（Pa O2/Fi O2）

carbon dioxide partialpressure（Pa CO2）and p H of arterial blood（p H）in two groups before weaning were compared. The factors influencing theoutcome of weaning were analyzed by Logistic regression

and the correlation between lung ultrasound scores and arterial bloodgas analysis indexes were analyzed. The value of lung ultrasound score in predicting the weaning success was analyzed byreceiver operating characteristic（ROC）curve. The success rate of weaning was analyzed by histogram.ResultsThe negativefluid balance

diaphragm mobility

Pa O2

Pa O2/Fi O2 in the successful weaning group before weaning were higher than those in theweaning failure group

and lung ultrasound scores

heart rate and Pa CO2 were lower than those in the weaning failure group

andthe differences were statistically significant（all P<0.05）. Logistic regression analysis showed that the negative fluid balance

heart rate

lung ultrasound score

Pa O2

Pa O2/Fi O2

and Pa CO2 before weaning were all related to the outcome of weaning（allP<0.05）.The lung ultrasound score was positively correlated with Pa CO2（r=0.677

P<0.05）

and negatively correlated with Pa O2

Pa O2/Fi O2（r=-0.850

-0.634

both P<0.05）. When the cut-off value >19.47 point

the AUC of lung ultrasound score inpredicting weaning sucess in patients with severe respiratory support was 0.784

the sensitivity was 54.55%

and the specificitywas 95.31%.ConclusionThe lung ultrasound score has a certain value in predicting the weaning success in patients withsevere respiratory support.