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

[c0205847]

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]

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).

[c0205847]

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[FergA]

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