| PEEP | positive end-expiratory pressure, peak end-expiratory pressure |
|---|---|
| PEEPi | intrinsic peak end-expiratory pressure |
| PEF | peak expiratory flow; Psychiatric Evaluation Form; pulmonary edema fluid |
| PEFR | peak expiratory flow rate |
| PER | peak ejection rate; periodogram; protein efficiency ratio |