The patients Atrial Fibrillation was treated with Digitalis to achieve rate control.
This tracing shows Atrial Tachycardia of 150/min, conducted to the ventricle with 2nd degree AV Block – Mobitz I (Wenckebach).
For many years it has been known that, with Digitalis excess, atrial fibrillation frequently converts to an ectopic Atrial Tachycardia, often somewhat irregular (such as this example).
The suppressive effect of Digitalis on the AV Node usually results in accompanying AV Block
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