| NTCP | noninvasive transcutaneous cardiac pacing; normal tissue complication probability |
|---|---|
| OCT | object classification test; optimal cutting temperature; oral contraceptive therapy; ornithine carba... |
| OHCA | out-of-hospital cardiac arrest |
| OOH/CA | out-of-hospital cardiac arrest |
| PCO | patient complains of; polycystic ovary; predicted cardiac output |