If the Purkinje system becomes the pacemaker, what is the typical rate?

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Study for the Cardiac HealthStream Telemetry Exam. Dive into detailed flashcards and multiple choice questions, each with helpful hints and explanations. Prepare thoroughly for your exam!

Multiple Choice

If the Purkinje system becomes the pacemaker, what is the typical rate?

Explanation:
When the Purkinje system becomes the heart’s pacemaker, you’re looking at an idioventricular escape rhythm. The Purkinje network lies in the ventricles and has slower automaticity than the atrial SA node or the AV junction. That slower automaticity translates to a typical rate of about 20 to 40 beats per minute. So this Purkinje-driven pacing produces a much slower rhythm than normal, which is why 20-40 bpm is the correct range. The other rates correspond to faster pacemaker sites (the SA node around 60-100 and the AV junction around 40-60), not the Purkinje system.

When the Purkinje system becomes the heart’s pacemaker, you’re looking at an idioventricular escape rhythm. The Purkinje network lies in the ventricles and has slower automaticity than the atrial SA node or the AV junction. That slower automaticity translates to a typical rate of about 20 to 40 beats per minute. So this Purkinje-driven pacing produces a much slower rhythm than normal, which is why 20-40 bpm is the correct range. The other rates correspond to faster pacemaker sites (the SA node around 60-100 and the AV junction around 40-60), not the Purkinje system.

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