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Flecainide : This is a potentially dangerous Na channel blocker which can cause ventricular dysrhythmias including ventricular fibrillation. Before continuing flecainide, he had me get on a treadmill at full dose and at full exercise (18 minutes) and measured the QRS to be certain that the QRS did not lengthen at all. Coincidence?).
The patient was found to have a "concealed" posteroseptal pathway (WPW without delta waves) confirmed to have SVT at EP study and was ablated. Here is the Electrophysilogist's note: "Only 1 pathway attachment could be ablated, the second one deep within the CS could not be ablated with high power.
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