| OET | oral endotracheal tube; oral esophageal tube |
|---|---|
| OHI | Occupational Health Institute; operative hypertension indicator; oral hygiene index; Oral Hygiene In... |
| PVC | Premature Ventricular Contraction(s) = VEB ? Ix of Tx ... |
| NS | natural science; Neosporin; nephrosclerosis; nephrotic syndrome; nervous system; neurological surger... |
| PSDES | primary symptomatic diffuse esophageal spasm |