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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 ...
A first-degree AV block is indicated on the ECG by a prolonged ... firing of the SA node). The atrial depolarization eventually spreads to the AV node where there is a slight delay before the ...
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