0.35-0.45 seconds (or less than 1/2 of the R-R interval)

2 small boxes (0.08 seconds)

3 small boxes (0.12 seconds)

6 seconds

Count each P wave and multiply by 100

Count the R waves (each QRS complex) and multiply by 10

Total the number of ST segments

Multiply the QRS interval time by 2

Count small boxes between R waves. Divide by 1500

Count all R waves and multiply by 10

Count all large boxes on strip

Count all large boxes on strip and divide by 1500

Find R wave that lands on line; count large boxes to the right.

Divide by 300

Count small boxes on entire strip

Count small boxes between R waves. Divide by 1500

Count all R waves and multiply by 10

Atrial Pacemaker

Sinus Bradycardia

Hear rate less than 60

PR interval greater than .20 seconds (over 5 small boxes)

Sinus Bradycardia

Sinus Tachycardia

Sinus Dysrhythmia

Norma Sinus Rhythm

Sinus Arrest

Sinus Bradycardia

Sinus Tachycardia

Sinus Dysrhythmia

Norma Sinus Rhythm

Sinus Arrest

Sinus Bradycardia

Sinus Tachycardia

Sinus Dysrhythmia

Norma Sinus Rhythm

Sinus Arrest

Sinus Bradycardia

Sinus Tachycardia

Sinus Dysrhythmia

Norma Sinus Rhythm

Sinus Arrest

Sinus Bradycardia

Sinus Tachycardia

Sinus Dysrhythmia

Norma Sinus Rhythm

Sinus Arrest

3:1

4:1

1:1

2:1

Atrial Fibrillation

Atrial Flutter

Sinus Tachycardia

Multifocal Atrial Tachycardia

0.12-0.20 seconds

0.04-0.10 seconds

0.20-0.30 seconds

0.30-0.40 seconds

P wave

QRS complex

T wave

U wave