= Each individual is sinus
= some group of faster rate
= some group of slower rate
= different between rate of each group
is more than 4 little boxes ( 0.16secs )
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Individual Sinus
- P-wave positive in Lead I/II/avF
- P-wave negative in Lead avR/V1
- PR-interval less than 5 little boxes
- QRS complex follow P-wave
- QRS complex less than 3 little boxes
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Happens when "Breathing"
Inspiration = Faster Rate
Expiration = Slower Rate
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