| AERP | antegrade effective refractory period; atrial effective refractory period |
|---|---|
| ESP | early systolic paradox; echo spacing; effective sensory projection; effective systolic pressure; end... |
| MEC | median effective concentration; middle ear canal; middle ear cell; minimum effective concentration |
| ET | educational therapy; effective temperature; ejection time; embryo transfer; endothelin; endotoxin; e... |
| BTC | basal temperature chart; body temperature chart |