NCLEX Review & Nursing School

First Degree AV Block

– usually a slow conduction of the impulse by the AV node.

– the PR interval is lengthened.

Rate

• Ventricular:  normal
• Atrial: normal

Rhythm

• R-R Interval: Regular
• P-P Interval: Regular

Duration

• PR Interval: > or = .20
• QRS Complex:  .6- .10

First Degree AV Block

– usually asymptomatic