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- AV node takes over the pacing of the heart- AV node fires and impulse travels back to SA node and forward through the bundle of HIs and purkinje fibers- P wave is retrograde (upside down) and often comes AFTER the QRS complex- P wave may be absent or hidden, OR upside down- HR is slowed to 40-60bpm (b/c AV node is pacing the heart), QRS is a little wider
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