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R-R interval is usually regular
QRS rate is increased (> 120/min), QRS duration is prolonged
QRS morphology is different from regular QRS
P waves : P wave is different some or all QRS complexes with constant R-P
interval ; or no P wave is visible; or sinus P rate is less than QRS rate
with AV dissociation
If the above criteria are met, ventricular tachycardia is defined as three
or more beats in a row
Slow ventricular tachycardia or accelerated ventricular rhythm meet the
above criteria, but have QRS rates of 120/min or less
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Supraventricular tachycardia with aberration
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