chap 11,12- ECG

Question 1

what event does each wave/complex/segment on ECG represent? + duration

Answer 1

P wave: atrial depolarization
- 0.08 - 0.10 sec

PR interval: from start of atrial depolarization (P wave) to start of ventricular depolarization (QRS complex) – includes AV nodal delay
- 0.12 - 0.20 sec

QRS complex: ventricular depolarization
- 0.06 - 0.10

ST segment: period b/w ventricular depolarization & repolarization (should be isoelectric)
- 0.08 - 0.12 sec

T wave: ventricular repolarization
- 0.10 - 0.25 sec

QT interval: from start of ventricular depolarization to end of ventricular repolarization (QRS to end of T wave)
- 0.36 - 0.44 sec