Second Degree AV Block (Mobitz)

Question 1

What is the rhythm of Second Degree AV Block Mobitz?

Answer 1

1. Regular atrial rhythm (Ps plot through on time)
2. Ventricular rhythm regular (sometimes irregular)

Question 2

What is the rate of Second Degree AV Block Mobitz?

Answer 2

Atrial: underlying sinus rhythm
Ventricular: Varies
*less than atrial

Question 3

What are the P-wave characteristics of Second Degree AV Block Mobitz?

Answer 3

1. 2 or 3 P waves before QRS
   *sometimes more

Question 4

What is the PR duration of Second Degree AV Block Mobitz?

Answer 4

1. May be normal or prolonged
   *REMAINS CONSTANT

Question 5

What is the QRS duration of Second Degree AV Block Mobitz?

Answer 5

1. Normal (Bundle of His) or wide (bundle branches)