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A first-degree, or 1 st degree, AV block is indicated on the ECG by ... of the SA node. The atrial depolarization eventually spreads to the AV node, where there is a slight delay before the ...
In second-degree atrioventricular nodal block — also known as Wenckebach block or Mobitz Type I AV block — varying failure of conduction through the AV node occurs, such that some P waves may ...
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