Click the sinoatrial node to fire a beat. Each impulse spreads through the atria, pauses at the AV node, then races down the His–Purkinje system. Tap faster and watch the P waves climb into the T waves.
FOAMfrat · Rhythm Lab
Tap the SA node for sinus rhythm, the AV node for a junctional beat (narrow QRS, small inverted P), or a ventricle for a ventricular beat: a wide, bizarre QRS with no P and a T pointing the opposite way.
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BPM
Awaiting impulse
No pacemaker activity. Fire the SA node to start.
Camel-hump T waves · P riding the T
Lead II traceP wave (atrial)T wave (ventricular repolarization)
75
P waves are mapped in red and T waves in blue, just like the lecture — watch them collide above 130–150 BPM. Built for live classroom use.