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Atrioventricular nodal reentrant tachycardia is the most common form of paroxysmal supraventricular tachycardia, comprising approximately 50 percent of all regular supraventricular tachycardia.
It is seen most often in healthy individuals without structural heart disease. Generally, the onset and termination of the tachycardia are abrupt. The episode may last seconds, minutes, hours, or days.
It is due to a circus movement reentry involving two electrical pathways generally known as fast & slow pathways within AV node – a specialized electrical tissue within heart .During circus movement tachycardia electric impulse recirculate continuously within a closed circuit without dying and produces fast heart rate or tachycardia. This is analogous to the sparking you see when two electric wires meet or short circuit.
Radiofrequency ablation produces excellent results and is currently the procedure of choice for treating symptomatic recurrent AV node reentrant tachycardia.
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