Pacemaker Simulator - Modes, Timing Cycles and Troubleshooting

Device teaching has a specific problem: the timing cycle is the whole subject, and it is invisible. Trainees learn the intervals as a list of abbreviations and then meet a strip where something is inhibited and cannot say why.

This runs in two halves. The seventeen basics modules build the components one at a time, from the pulse itself through the electrode, sensing, and the full dual-chamber timing cycle. The simulator then puts a live pacemaker on a moving ECG strip where the fault can be introduced and watched.

Using it in a teaching session

Start with complete heart block in DDD and let it run normally, so the room knows what correct looks like before anything is wrong.

Then break it. Loss of capture, atrial undersensing, myopotential inhibition and crosstalk each produce a distinct appearance, and the diagnostic reasoning is the lesson. Crosstalk into ventricular safety pacing is the one most people have heard named and never actually seen.

Upper-rate behaviour is the other high-value module. Wenckebach and 2:1 upper-rate response confuse people precisely because both are the device working correctly, and watching the transition as the atrial rate climbs makes that clear.

Retrograde conduction into pacemaker-mediated tachycardia is worth ending on, since it ties sensing, timing and the underlying physiology together.

What the model simplifies

Thresholds, impedances and conduction behave more predictably than in a real patient, and the model does not attempt manufacturer-specific algorithm differences, which in practice matter a great deal. It teaches the principles that are common to all devices, not any particular programmer.