Which of the following events cause closure of ductus arteriosus in new born
Aeration of newborn lung causes rapid replacement of bronchial and alveolar fluid by air, with this compression of pulmonary vasculature is lowered which results in fall in pulmonary arterial blood pressure.
Thus ductus arteriosus closes.
Compression of thorax during delivery
Compression of pulmonary vessels during delivery
Fall in pulmonary arterial pressure
Fall in systemic arterial pressure