Second Degree AV Block (Wenckebach)

Question 1

What is the rhythm of a second degree AV block (Wenckebach)

Answer 1

1. Regular atrial rhythm
2. Irregular ventricular rhythm

Question 2

What is the rate of a second degree AV block (Wenckebach)

Answer 2

1. Atrial: underlying rhythm
2. Ventricular: varies (less than atrial)

Question 3

What are the P wave characteristics of a second degree AV block (Wenckebach)

Answer 3

Sinus

Question 4

What is PR duration of a second degree AV block (Wenckebach)

Answer 4

Varies
*Will progressively lengthen until a P wave is not conducted
*P wave with no QRS
*will be a pause after the QRS complex

Question 5

What is the QRS duration of a second degree AV block (Wenckebach)

Answer 5

Normal