Cardiac Nursing NR 341 EKG Interpretation| SA Node, AV Node, Bundle of His,
Purkinje Fibers, PR Interval, ST Segment, QT Interval, P Wave, QRS Complex, T
Wave, Normal Sinus Rhythm, Sinus Bradycardia, Sinus Tachycardia, Atrial
Fibrillation, Atrial Flutter, Premature Atrial Complex, SVT, First/Second/Third
Degree AV Block, Wolf-Parkinson-White, Ventricular Tachycardia, Ventricular
Fibrillation, Pulseless Electrical Activity, Cardioversion, Defibrillation, ACLS
Protocols, Atropine, Antiarrhythmic Therapy, Beta Blockers, Calcium Channel
Blockers, Pacemaker Management Exam Questions Verified and Provided with
Complete A+ Graded Rationales Latest Updated 2026
SA node (60-100 bpm)
AV node (40-60 bpm)
Bundle of His
R & L bundle branches
Purkinje fibers (30-40 bpm)
What is the cardiac conduction pathway?
Measured from beginning of the P wave to the beginning of the QRS, represents time needed
for SA node stimulation, atrial depolarization and conduction through the AV node before
ventricular depolarization
What does the PR interval represent?
Lasts from the end of the QRS complex to the beginning of the T wave, represents time between
ventricular depolarization (contraction/systole) and repolarization (filling/diastole). The ST
segment is normally isoelectric (at baseline) but is analyzed to determine cardiac ischemia.
, What does the ST segment represent?
Measured from the beginning of the QRS complex to the end of the T wave, represents entire
time for ventricular depolarization and repolarization
What does the QT interval represent?
Atrial depolarization (contraction)
What does the P wave represent?
Ventricular depolarization (contraction)
What does the QRS complex represent?
Ventricular repolarization (relaxation)
What does the T wave represent?
120-200 ms
What is the normal PR interval length?
Purkinje Fibers, PR Interval, ST Segment, QT Interval, P Wave, QRS Complex, T
Wave, Normal Sinus Rhythm, Sinus Bradycardia, Sinus Tachycardia, Atrial
Fibrillation, Atrial Flutter, Premature Atrial Complex, SVT, First/Second/Third
Degree AV Block, Wolf-Parkinson-White, Ventricular Tachycardia, Ventricular
Fibrillation, Pulseless Electrical Activity, Cardioversion, Defibrillation, ACLS
Protocols, Atropine, Antiarrhythmic Therapy, Beta Blockers, Calcium Channel
Blockers, Pacemaker Management Exam Questions Verified and Provided with
Complete A+ Graded Rationales Latest Updated 2026
SA node (60-100 bpm)
AV node (40-60 bpm)
Bundle of His
R & L bundle branches
Purkinje fibers (30-40 bpm)
What is the cardiac conduction pathway?
Measured from beginning of the P wave to the beginning of the QRS, represents time needed
for SA node stimulation, atrial depolarization and conduction through the AV node before
ventricular depolarization
What does the PR interval represent?
Lasts from the end of the QRS complex to the beginning of the T wave, represents time between
ventricular depolarization (contraction/systole) and repolarization (filling/diastole). The ST
segment is normally isoelectric (at baseline) but is analyzed to determine cardiac ischemia.
, What does the ST segment represent?
Measured from the beginning of the QRS complex to the end of the T wave, represents entire
time for ventricular depolarization and repolarization
What does the QT interval represent?
Atrial depolarization (contraction)
What does the P wave represent?
Ventricular depolarization (contraction)
What does the QRS complex represent?
Ventricular repolarization (relaxation)
What does the T wave represent?
120-200 ms
What is the normal PR interval length?
