| beg | begin, beginning |
|---|---|
| P-R | the time between the P wave and the beginning of the QRS complex in electrocardiography [interval] |
| Q-T | in electrocardiography, the time from the beginning of the QRS complex to the end of the T wave [int... |
| S-T | [segment] in electrocardiography, the portion of the segment between the end of the S wave and the b... |
| ALS | acute lateral sclerosis; advanced life support; afferent loop syndrome; amyotrophic lateral sclerosi... |