| MTBF | mean time between (or before) failures |
|---|---|
| P-R | the time between the P wave and the beginning of the QRS complex in electrocardiography [interval] |
| QRS-ST | the junction between the QRS complex and the ST segment in the electrocardiogram [junction] |
| QRS-T | the angle between the QRS and T vectors in vectorcardiography [angle] |
| S-T | [segment] in electrocardiography, the portion of the segment between the end of the S wave and the b... |