Electrocardiogram Flashcards
P-wave?
Atrial depolarization
What happens to the atrial repolarization?
It is masked by the QRS complex
PR interval?
Conduction delay through AV node
How long is the PR interval?
<200 msec
QRS complex?
Ventricular depolarization
How long is the QRS complex?
<120 msec
QT interval?
Mechanical contraction of the ventricles
T-wave?
Ventricular repolarization
What would a T-wave inversion indicate?
Recent MI
ST segment?
Isoelectric, ventricles depolarized
U-wave?
- Hypokalemia
- Bradycardia
What is the speed of conduction order?
Purkinje>Atria>Ventricles>AV Node
What are the pacemakers speed of conduction?
SA>AV>Bundle of His/Purkinje/Ventricles
What is the conduction pathway?
SA Node–>Atria–>AV node–>Common bundle–>Bundle branches–>Purkinje fibers–>Ventricles
A prolongued QT interval can lead to ….
Torsades de pointes