Atrioventricular block

Question 1

Atrioventricular block?

Answer 1

In atrioventricular (AV) block, or heart block, there is impaired electrical conduction between the atria and ventricles. There are three types.

Question 2

First degree heart block?

Answer 2

PR interval > 0.2 seconds

Question 3

Second degree heart block?

Answer 3

• type 1 (Mobitz I, Wenckebach): progressive prolongation of the PR interval until a dropped beat occurs
• type 2 (Mobitz II): PR interval is constant but the P wave is often not followed by a QRS complex

Question 4

Third degree (complete) heart block?

Answer 4

there is no association between the P waves and QRS complexes