| PEPc | corrected pre-ejection period |
|---|---|
| PEPI | pre-ejection period index |
| PER | peak ejection rate; periodogram; protein efficiency ratio |
| PET | peak ejection time; polyethylene terphthalate; poor exercise tolerance; positron emission tomography... |
| REF | ejection fraction at rest; referred; refused; renal erythropoietic factor |