ECG (JCMC)

Quiz yourself by guessing what should be in each of the black rectangles below before clicking on it to display the answer.

Help

Dysrhythmia

Rate

Rhythm

P Waves

PR Interval

QRS Complex

Sinus Bradycardia

<60

Regular

Upright & Normal

Normal

Sinus Tachycardia

>100

Regular

Upright & Normal

Normal

Sinus Dysrhythmia

60 - 100

Irregular

Upright & Normal

Normal

Sinus Arrest

Normal to slow

Irregular

Upright & Normal

Normal

First Degree AV Block

Depends on underlying rhythm

Usually regular

Normal

>0.20 sec

Usually <0.12 sec

Type I Second Degree AV Block

Atrial - normal, ventricular – normal to slow

atrial – regular, ventricular -- irregular

Normal, some P waves not followed by QRS complex

Increases until QRS drops, then repeats

Usually <0.12 sec

Type II Second Degree AV Block

Atrial - normal, ventricular – normal to slow

may be regular or irregular

Normal, some P waves not followed by QRS complex

Constant for conducted beats, may be >0.12 sec.

Normal or >0.12 sec

Third Degree AV Block

Atrial - normal, ventricular – 40 - 60

Both atrial and ventricular are regular

Normal with no correlation to QRS complex

No relation to QRS complex

0.12 sec or greater

Premature Junctional Contractions

Depends on underlying rhythm

Inverted, may occur after QRS complex

Normal if P wave occurs before QRS complex

Usually normal

Junctional Escape Complexes and Rhythms

40 - 60

Irregular in single occurrence; regular in escape rhythm

Inverted, may occur after QRS complex

Normal if P wave occurs before QRS complex

Usually normal

Accelerated Junction Rhythm

60 -100

Regular

Inverted, may occur after QRS complex

Normal if P wave occurs before QRS complex

Normal

Paroxysmal Junctional Tachycardia

100 - 180

Regular

Inverted, may occur after QRS complex

Normal if P wave occurs before QRS complex

Normal