| ACH | acetylcholine; achalasia; active chronic hepatitis; adrenocortical hormone; amyotrophic cerebellar h... |
|---|---|
| AIM | Abridged Index Medicus; acute transverse myelopathy; area of interest magnification; artificial inte... |
| ALI | acute lung injury; annual limit of intake; average lobe index |
| APACHE | Acute Physiology and Chronic Health Evaluation [severity-of-illness index] |
| APTI | airway pressure time index |