Author Question: A 2:1 AV block is characterized by _____ intervals. a. irregular P to P b. irregular R to R ... (Read 158 times)

c0205847 · **on:** Jun 25, 2018

A 2:1 AV block is characterized by _____ intervals.

a. irregular P to P
b. irregular R to R
c. regular P to P intervals and regular R to R
d. irregular P to P intervals and regular R to R

Question 2

The rate of an idioventricular rhythm is _____ beats/min.

a. 20 to 40
b. 41 to 60
c. 61 to 100
d. 101 to 180

Carliemb17 · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

C
Second-degree 2:1 AV block is characterized by regular P-P and R-R intervals. P waves are normal in size and shape, but every other P wave is not followed by a QRS. The atrial rate is twice the ventricular rate.

Answer to Question 2

A
The intrinsic rate of an idioventricular rhythm, which is also called a ventricular escape rhythm, is 20 to 40 beats/min (i.e., the intrinsic firing rate of the Purkinje fibers).