Author Question: Complete the following ECG criteria for third-degree AV block: Rhythm ... (Read 107 times)

DyllonKazuo · **on:** Jun 25, 2018

Complete the following ECG criteria for third-degree AV block:

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

Fill in the blanks with correct word

Question 2

The point where the QRS complex and ST segment meet is called the ST junction or the J point.

Indicate whether the statement is true or false

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

Answer to Question 1

Rhythm Ventricular regular; atrial regular (Ps plot through); no relationship between the atrial and ventricular rhythms (i.e., AV dissociation is present).
Rate The ventricular rate is determined by the origin of the escape rhythm; the atrial rate is greater than (and independent of) the ventricular rate; ventricular rate is determined by the origin of the escape rhythm.
P waves Normal in size and shape; some P waves are not followed by a QRS complex (i.e., more Ps than QRSs).
PR interval None. The atria and the ventricles beat independently of each other; therefore there is no true PR interval.
QRS duration Narrow or wide, depending on the location of the escape pacemaker and the condition of the intraventricular conduction system.

Answer to Question 2

T
The point where the QRS complex and the ST segment meet is called the ST junction or the J point. The ST segment is considered elevated if the segment is deviated above the baseline and is considered depressed if the segment deviates below it.