NCLEX Review & Nursing School

Second Degree AV Block

–   “Wenckenbach” also is called.

– often seen after a myocardial infarction

– the PR interval is getting progressively longer until one P wave is not followed by an QRS complex.

Rate

• Ventricular:  slow
• Atrial: greater than ventricular

Rhythm

• R-R Interval: irregular
• P-P Interval: irregular

Duration

• PR Interval: normal or prolonged
• QRS Complex:  Normal

Second Degree AV Block  (Mobitz Type)

– ♣ Can lead to cardiac arrest or V Fib.

– paroxysm of 3 beats or more.

– Prepare patient for cardioversion.