| 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 |
| BM | Bachelor of Medicine; barium meal; basal medium; basal metabolism; basement membrane; basilar membra... |
| MMR | mass miniature radiography; masseter muscle rigidity; maternal mortality rate; measles-mumps-rubella... |