Sinus Exit Block - Sinus Rhythm.

Description

• Sinus Exit Block looks very much the same as Sinus Arrest with one important distinction.
• The duration of the pause with Sinus Exit Block is in a direct multiple of the R to R interval of the underlying rhythm. Sinus Arrest does not have this specific feature.

Practice Strip

Analyze this tracing using the five steps of rhythm analysis.

Show Answer

• Rhythm: Irregular
• Rate: 40 bpm
• P wave: upright and uniform
• PR interval: 0.16 sec
• QRS: 0.10 sec
• Interpretation: Sinus Exit Block