NCLEX EKG Interpretation Flashcards
P wave represents…
atrial depolarization
normally precedes the QRS complex
P Wave time
0.06 - 0.12 seconds
P wave length
1.5 - 3 boxes
PR interval represents…
Start of P wave to QRS complex
Time for atrial depolarization
Time for impulse to leave SA node and go through AV node to ventricles
PR interval time
0.12 - 0.2 seconds
PR interval length
3 - 5 boxes
QRS complex represents…
Start of Q wave to the end of S wave
Ventricular depolarization (and atrial repolarization)
QRS complex time
< 0.12 seconds
QRS complex length
< 3 boxes
ST segment represents…
time from completion of ventricular depolarization and beginning of ventricular repolarization
ST segment time
0.12 seconds
ST segment length
3 boxes
T wave represents…
ventricular repolarization
T wave time
0.16
T wave length
4 boxes
