目的探讨肺表面活性物质（PS）对支气管肺发育不良（BPD）的预防和治疗意义。

Objective The aim of this study was to determine the therapeutic effect of pulmonary surfactant (PS) on the development of bronchopulmonary dysplasia (BPD) in premature infants.

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目的分析早产儿支气管肺发育不良(BPD)的发生率和危险因素，探讨防治BPD的措施。

Objective to study the incidence, risk factors, prophylaxis and treatment for bronchopulmonary dysplasia (BPD) in premature.

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目的探讨极低出生体质量儿（VLBWI）并支气管肺发育不良（BPD）的危险因素及预防对策。

Objective To investigate the risk factors, prevention and treatment of bronchopulmonary dysplasia(BPD) in very low birth weight infants(VLBWI).

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目的探讨极低出生体质量儿（VLBWI）并支气管肺发育不良（BPD）的危险因素及预防对策。

Objective To investigate the risk factors, prevention and treatment of bronchopulmonary dysplasia(BPD) in very low birth weight infants(VLBWI).

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