ecg

P Wave

Atrial Depolarization (spreads signal through atria,

causing contraction).

P-R Interval

Time from start of atrial depolarization to start of ventricular depolarization.

what is a normal duration for a P-R interval

0.12 to 0.20 (3 to 5 small squares)

QRS Complex

Ventricular Depolarization (main pumping contraction;

larger due to muscle mass).

how much is a normal duration for a QRS complex?

0.08 to 0.12 seconds (2 to 3 small squares)

T Wave

Ventricular Repolarization (electrical recovery of heart

cells).

Q-T Interval

Total time for ventricular depolarization and

repolarization.

how much is a normal duration of Q-T interval

0.35 to 0.43 seconds

normal sinus rhythm

sinus bradycardia

sinus tachycardia

atrial fibrillation

premature ventricular contractions

ventricular tachycardia

ventricular tachycardia