
Sinus Tachycardia = Sinus conducting wave + faster Rate
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Faster Rate = More than 100 bpm
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Sinus conducting wave
1) P-wave
- Postitive in Lead I/II/avF
 - Negative in Lead avR/V1
 - Follow by QRS in every beat
 
2)PR-interval
- Less than 5 little box
 - means no block
 
3)QRS
- follow every p-wave
 - Less than 3 little boxes
 
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