A rhythm is sinus or comes from the SA node if there is a P wave before each QRS and the P is in the same direction as the QRS. There should be only one P before each QRS and should raise in only one direction except in leads V1 and V2. The P wave should be closer than 200 ms to the QRS and should be gently rounded
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Author: Tim Otter KS in RRT
Last Update:4/6/2008 8:22:25 PM
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