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With what rhythm does this strip begin?
Is the QRS duration and shape normal?  What do these indicate?
What is notable about the seventh beat?  Is the beat earlier than expected?  Is the QRS duration and shape different?  What do these indicate?
What is the R-R interval at the start of the strip?  What is the interval between the two sinus beats that precede and follow the seventh beat?  What is the relationship between these intervals?
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