cardiology query for doctors or ACLS certified nation.?

What are the criteria for Atrial tach vs. SVT? I know atrial tach is an SVT, but when is it specifically AT? What's the difference on the rhythm strip between an AVNRT and AVRT? Impulses originate within an atrial pacemaker at a rate 140-250/min. Atrial activity may be represented by adjectives P in L2 or by P superimposed on T or ST segment of the preceding whitewash. At very speedy rates only every second P may be followed by QRS (2:1 AV block) beside the resulting ventricular rate half the atrial. QRS usually smaller amount than 0.11 sec; wide and bizarre QRS mat be due to preexisting BBB or WPWS or due to aberrancy adjectives at rapid rates. Onset and termination of AT is regularly abrupt. Vagal stimulation frequently terminate AT.
Supraventricular tachycardia (SVT) occurs when an impressive electrical impulse originate causes of supra ventricular tachycardia above the ventricles, but instead of cause a single beat and a interval, it travels in circles and cause many swift beats. To distinguish SVT from Sinus Tachycardia one must simply look at the rate: If the rate of contraction is more than 150 bpm, next it is considered SVT. Otherwise it is multifocal atrial tachycardia Sinus Tachycardia