| AHR | antihyaluronidase reaction; Association for Health Records; atrial heart rate |
|---|---|
| ANESR | apparent norepinephrine secretion rate |
| Ang GR | angiotensin generation rate |
| ANTR | apparent net transfer rate |
| AOO | anodal opening odor; atrial asynchronous (competitive, fixed-rate) [pacemaker] |