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📘 How Pacemakers Work

Your heart normally follows electrical instructions that begin in the sinoatrial node and travel through a conduction pathway.

2
lessons
~10 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. A Backup Rhythm on CallExplain the generator, leads, sensing, capture, and demand pacing.A pacemaker monitors intrinsic electrical activity and delivers small timed pulses through leads when programmed conditions indicate support is needed.
  2. Modes Describe the ConversationCompare pacing modes and explain why programming and follow-up remain part of care.Pacing modes describe chamber coordination and rate response; settings are reviewed and adjusted with clinical supervision over time.

Questions this course answers

What is the main role of sensing in a pacemaker?

Sensing lets the generator detect intrinsic cardiac activity and withhold or deliver pacing according to its programmed timing.

Put the basic demand-pacing sequence in order.

A demand pacemaker listens first, applies its timing logic, then either inhibits pacing or sends a pulse.

Match each pacing arrangement with its main idea.

The number and placement of leads determine which chambers the system can sense and pace directly.

Grounded in trusted sources

  • NHLBI, Pacemakers - How They Work: https://www.nhlbi.nih.gov/health/pacemakers/how-it-works
  • American Heart Association, Pacemaker: https://www.heart.org/en/health-topics/arrhythmia/prevention--treatment-of-arrhythmia/pacemaker
  • FDA, Product Classification - Device pulse generator, permanent, implantable: https://www.accessdata.fda.gov/scripts/cdrh/cfdocs/cfpcd/classification.cfm?id=1169
  • FDA, Product Information Manual - Pacemaker: https://www.accessdata.fda.gov/cdrh_docs/pdf/P980035c.pdf
  • MedlinePlus, Heart pacemaker: https://medlineplus.gov/ency/article/007369.htm
  • Wikimedia Commons, Pacemakers category and individual file metadata: https://commons.wikimedia.org/wiki/Category:Pacemakers

Every Wunder lesson is built from real, reputable sources — never invented.

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