The complications of HMD included sever emphysem (3 cases), atelectasis (3 cases), pneumothorax (4 cases), pneumonia (11 cases), pulmonary hemorrhage (7 cases), BPD (2 cases), PDA(19cases), necrotic enterocolitis (4 cases).

• 本组病例并发症较多,主要有重度肺气肿、肺不张各3例,气胸4例,肺炎11例,肺出血7例,BPD 2例,NEC 4例,PDA 19例。