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Complete Heart Block Resulting in Extreme Bradycardia

Image 1 of 2 in Series "Complete Heart Block Treated with Ventricular Pacing"

Description

The underlying rhythm is sinus tachycardia with a single premature atrial complex (tenth P wave). The sinus rate is 101/min. The only QRS complex on this recording is a junctional complex that follows the fifth P wave and has a right bundle branch block configuration.

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This image is part of the series "Complete Heart Block Treated with Ventricular Pacing"

Other images in this series

Complete Heart Block and Ventricular Pacing

by: Joe B. Calkins, Jr., M.D.

The underlying rhythm is normal sinus rhythm at a rate of 96/min. Ventricular pacing is occurring at a programmed rate of 60/min. Note that there is no sensing of atrial activity as shown by the separate atrial and ventricular rhythms. Sensing of ventricular activity is demonstrated by the occurrence of a premature ventricular complex (eighth QRS complex), which resets the timing of ventricular pacing. The ninth QRS complex is ventricular paced and follows the PVC at the programmed rate of 60/min.