Normal Sinus Rhythm 
= Sinus conducting Rhythm
= Sinus conducting + Sinus Rate
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Sinus Rate = 60 - 100 bpm
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Sinus conducting 
1) P-wave
- Positive in Lead I/II/avF
 - Negative in Lead avR/V1
 - Following by Fellow QRS complex of the same rate
 - ( 60-100bpm)
 
2)PR-interval
- less than 5 little box
 - means normal conduction from SA-node to AV-node
 - ( They can travel along in time )
 
3)QRS complex
- Follow every P-wave
 - Same rate to P-wave
 - Less than 3 little box
 
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