atrial-septal defect

initialism: ASD
https://doi.org/10.1351/goldbook.10438

Defect in the septum between the atria of the heart, due to failure of normal closure of the foramen ovale in the perinatal period.

Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 728 [Terms] [Paper]