Gynaecology & Obstetrics Which of the following events cause closure of ductus arteriosus in new born A Compression of thorax during delivery B Compression of pulmonary vessels during delivery C Fall in pulmonary arterial pressure D Fall in systemic arterial pressure 💡 Explanation Which of the following events cause closure of ductus arteriosus in new born ✓ Correct Answer: C. Fall in pulmonary arterial pressure