| 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 |
| ARI | acute respiratory illness; airway reactivity index; anxiety reaction, intense |