Practice thinking like an EP technologist.
Synthetic cases that reinforce structured observation, signal interpretation, mapping logic, device concepts, troubleshooting, and responsible technology use.
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Narrow-Complex Tachycardia: Start With Description
Practice describing a regular narrow-complex tachycardia before jumping to mechanism.
Open case →Identify A, H, and V
Use timing and channel context to identify components on a simplified His-region tracing.
Open case →Coronary Sinus Activation Sequence
Interpret an illustrative distal-to-proximal atrial activation pattern without overcalling mechanism.
Open case →All Catheters Shift Together
A map suddenly shifts while independent position information appears unchanged.
Open case →The Earliest Point Is Noisy
A focal activation map highlights an 'earliest' point with poor electrogram quality.
Open case →Pacing Artifact Without QRS
A pacing artifact is visible, but the expected ventricular response is not obvious.
Open case →Device Detects Events Not Seen on Surface Rhythm
Stored device events appear rapid, but the surface rhythm does not match.
Open case →One EGM Channel Suddenly Becomes Noisy
Practice localizing a recording problem before troubleshooting.
Open case →Automatic Annotation Changes Component
An annotation algorithm begins selecting a different electrogram component after a morphology change.
Open case →AVNRT vs AVRT: Avoid the Shortcut
A regular SVT has concentric atrial activation and short VA timing.
Open case →Stimulus → Response Reasoning
Programmed stimulation is delivered and one premature stimulus does not depolarize the intended tissue.
Open case →AI Flags an Arrhythmia
An AI-enabled tool flags a rhythm as likely atrial fibrillation, but the tracing quality is poor.
Open case →How to use the Practice Lab
1. Describe the observable data. 2. Decide what the clue supports or does not support. 3. Choose the safest next reasoning step. 4. Read the feedback even when you answer correctly.