Intervals and segments
| PR Interval: |
From the start of the P wave to the start of the QRS complex |
| PR Segment: |
From the end of the P wave to the start of the QRS complex |
| J Point: |
The junction between the QRS complex and the ST segment |
| QT Interval: | From the start of the QRS complex to the end of the T wave |
| QRS Interval: | From the start to the end of the QRS complex |
| ST Segment: | From the end of the QRS complex (J point) to the start of the T wave |
