Interpret the following rhythm:

A) Normal sinus rhythm
B) Sinus rhythm with second-degree AV block
C) Complete heart block
D) Sinus rhythm with first-degree AV block

Question

Interpret the following rhythm:

A) Normal sinus rhythm 
B) Sinus rhythm with second-degree AV block 
C) Complete heart block 
D) Sinus rhythm with first-degree AV block

Quizplus · Accepted Answer

In first-degree block,P and QRS waves are consistent in shape.P waves are small and rounded.A P wave precedes every QRS complex,which is followed by a T wave.PR interval is prolonged and is greater than 0.20 seconds.QRS complex and QT/QTc measurements are normal.Normal sinus rhythm (NSR)reflects normal conduction of the sinus impulse through the atria and ventricles.Atrial and ventricular rates are the same and range from 60 to 100 beats per minute.Rhythm is regular or essentially regular.PR interval is 0.12 to 0.20 seconds.In a complete heart block,the atria and ventricles beat independently of each other.A first-degree AV block means the PR interval is greater than 0.20 seconds.

Interpret the Following Rhythm