| OA | obstructive apnea; occipital artery; occipito-anterior; occiput anterior; octanoic acid; ocular albi... |
|---|---|
| OES | oral esophageal stethoscope; optical emission spectroscopy |
| OET | oral endotracheal tube; oral esophageal tube |
| Pes | esophageal pressure |
| PSDES | primary symptomatic diffuse esophageal spasm |