| IABP | intra-aortic balloon pump |
|---|---|
| IACP | intra-aortic counterpulsation |
| IAO | immediately after onset; intermittent aortic occlusion; International Association of Orthodontists |
| IBP | insulin-like growth factor binding protein; International Biological Program; intra-aortic balloon p... |
| LA/Ao | left atrial/aortic [ratio] |