ECG - Atrial

1. Normal Sinus

1.1. From SA Node

1.2. P wave before QRS

1.3. PR - 0.12 - 0.20

1.4. QRS - same shape and size - < 0.12

1.5. Rhythm = P-P & R-R; Regualr

1.6. Rate = 60 - 100 bpm

2. Premature Atrial Contraction

2.1. From Atria

2.2. P wave premature

2.3. PR interval varies

2.4. Usually followed by a pause

2.4.1. Compensatory if the next heart beat comes in on time

2.4.2. Non-Compensatory if the next heart beat doesn't come in on time

3. Atrial Tachycardia

3.1. From Atria

3.2. P wave before QRS

3.2.1. May be buried in preceding T wave

3.3. Rate = 151 - 250 bpm

4. Atrial Flutter

4.1. From Atria

4.2. P waves not present

4.3. Flutter waves

4.3.1. Saw toothed in shape; size may vary

4.4. PR interval cannot be measured

4.5. Rhythm regular except with varying block

4.6. Atrial Rate:

4.6.1. 250 - 350

4.7. Ventricular Rate:

4.7.1. 60 - 100

5. Atrial Fibrillation

5.1. From Atria

5.2. No distictive P wave

5.2.1. No PR interval

5.3. R - R irregular

5.4. Atrial Rate:

5.4.1. 350 - 500

5.5. Ventricular Rate:

5.5.1. < 60 = Slow ventricular response

5.5.2. 60 - 100 = Controlled A. Fib

5.5.3. 101 - 150 = Rapid ventricular response

5.5.4. > 150 = Uncontrolled A. Fib