目的 探讨应用床旁肺部超声评分（LUS）对重症患儿撤机结局的预测价值。方法 选取2019年1—12月收 入重症监护病房的机械通气患儿。在撤机前对患儿实施床旁LUS，同步采集患儿的浅快呼吸指数（RSBI）和氧合指数（P/ F值），随访撤机结局。用受试者工作特征曲线（ROC）及曲线下面积（AUC）评价LUS评分对患儿撤机结局的预测价值。 结果 共纳入患儿106例，男62例、女44例，中位年龄9（3，36）月。撤机成功97例（91.5%），失败9例（8.5%）。与撤机 成功组相比，撤机失败组患儿的PICU住院时间、置管时间均延长，危重度评分降低，LUS和RSBI值较高，P/F值较低，差 异均有统计学意义（P

Objective To explore the predictive value of bedside lung ultrasound score on the outcome of liberation from mechanical ventilation in critically ill children. Methods The children who received mechanical ventilation in the intensive care unit (ICU) from January to December 2019 were studied. The bedside lung ultrasound score (LUS) was performed before extubation, and the rapid shallow breathing index (RSBI) and oxygenation index (P/F) were collected simultaneously. The outcome of liberation was followed up. The receiver operating characteristic curve (ROC) and area under curve (AUC) were used to evaluate the predictive value of LUS score for the outcomes. Results In 106 children ( 62 boys and 44 girls) with median age of 9 ( 3 ~ 36 ) months, 97 cases ( 91 . 5 %) were successful and 9 cases ( 8 . 5 %) failed. Compared with the successful group, the PICU stay and catheterization time were longer, the severity score was lower, the LUS and RSBI were higher and the oxygenation index (P/F) was lower (all P< 0. 05 ) in the failure group. LUS score ≥ 16 was the best cut-off value for predicting liberation failure (AUC= 0 . 991 , sensitivity 88 . 9%, specificity 97 . 9%, P< 0 . 01 ), and the predictive efficacy was significantly better than P/F value and RSBI value (P< 0 . 05 ). Conclusions? Bedside LUS can effectively assist in evaluating the readiness of liberation from mechanical ventilation, and has a high predictive value for liberation outcome.