How can you give an account the difference between sinus tachycardia and a superventricular tachycardia on a 3-lead?

I have been wondering what the difference would be on a rhythm strip. I know how it is different in hypothesis but what differences would there be on an electrocardiogram?
Answers:
The difference between sinus tach. & SVT is the rate. Sinus tach. is a sinus rhythm between 100 & 160 bpm (150 for some of the old-schoolers). SupRAventricular tachycardia is an excessively tachy. rhythm that originates above the ventricles. Source(s): paramedic
Sinus tachycardia will have P side because the impulse originates from the SA node. SVT does not have P side as the origin is not from the SA node. Source(s): PA

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