RT Journal Article SR Electronic T1 Haemodynamic challenge in non-restrictive atrial septal defect JF Heart Asia FD BMJ Publishing Group Ltd, British Cardiovascular Society and Asia Pacific Heart Association SP e011014 DO 10.1136/heartasia-2018-011014 VO 10 IS 2 A1 Arun Gopalakrishnan A1 Krishna Kumar Mohanan Nair A1 Sanjay Ganapathi YR 2018 UL http://heartasia.bmj.com/content/10/2/e011014.abstract AB