Patent ductus arteriosus, decreased post-dose pulmonary function values, all grade intraventricular haemorrhage, sepsis, retinopathy of prematurity, bradycardia, severe intraventricular haemorrhage. Pulmonary interstitial emphysema, periventricular leukomalacia, pneumothorax, pulmonary haemorrhage, endotracheal tube complications, necrotizing enterocolitis, resp acidosis, convulsions, hypotension, apnoea, hydrocephalus, pneumonia.