| APM | Academy of Parapsychology and Medicine; Academy of Physical Medicine; Academy of Psychosomatic Medic... |
|---|---|
| APRV | airway pressure release ventilation |
| APTI | airway pressure time index |
| ATP | adenosine triphosphate; ambient temperature and pressure; autoimmune thrombocytopenic purpura |
| ATPD | dried at ambient temperature and pressure |