Author Question: Complete the following ECG criteria for 2:1 AV block: Rhythm ... (Read 108 times)

azncindy619 · **on:** Jun 25, 2018

Complete the following ECG criteria for 2:1 AV block:

Rhythm ___________________ ___________________ __
Rate ___________________ ___________________ __
P waves ___________________ ___________________ __
PR interval ___________________ ___________________ __
QRS duration ___________________ ___________________ __

Fill in the blanks with correct word

Question 2

List four reasons why the ventricles may assume responsibility for pacing the heart.

What will be an ideal response?

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

Answer to Question 1

Rhythm Ventricular regular; atrial regular (Ps plot through on time).
Rate Atrial rate is twice the ventricular rate.
P waves Normal in size and shape; every other P wave is not followed by a QRS complex (i.e., more Ps than QRSs).
PR interval Constant.
QRS duration May be narrow or wide; complexes are absent after every other P wave.

Answer to Question 2

The ventricles may assume responsibility for pacing the heart if the sinoatrial (SA) node fails to discharge, an impulse from the SA node is generated but blocked as it exits the SA node, the rate of discharge of the SA node is slower than that of the ventricles, or an irritable site in either ventricle produces an early beat or rapid rhythm.