Skip to Main Content

We have a new app!

Take the Access library with you wherever you go—easy access to books, videos, images, podcasts, personalized features, and more.

Download the Access App here: iOS and Android. Learn more here!

ECG Findings

  • Intermittent nonconducted P waves with a constant PR interval.

  • P-P interval is constant, and R-R interval is constant until the dropped beat.

  • R-R interval surrounding dropped beat(s) should be an exact multiplication of the number of dropped beats (eg, double RR interval for a single dropped beat, four times the RR interval for two dropped beats, etc.).

Pearls

  1. This type of AV nodal block is associated with disease of the conduction system distal to the AV node. A pacemaker is usually indicated.

  2. Mobitz type II block can accompany MI and has a high chance of progression to a complete heart block.

FIGURE 23.16A

Type II Second-Degree AV Block (Mobitz II). (ECG contributor: Michael L. Juliano, MD.)

FIGURE 23.16B

The PR interval is constant (double arrows) until the dropped beat (brackets).

Pop-up div Successfully Displayed

This div only appears when the trigger link is hovered over. Otherwise it is hidden from view.