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TACHYCARDIA, DEFINITION, Abnormal tachycardia is a rapid heartbeat out of proportion to Metabolic demands on the, circulation., TACHYCARDIA FROM ATRIOVENTRICULAR NODAL REENTRY, Atrioventricular nodal reentrant tachycardia is the most common cause of paroxysmal, tachycardia., It has dual AV nodal pathway., The fast pathway is believed to be located within or near the AV node., The slow one adjacent to and usually inferior to the node, lying closer to coronary sinus., Cryosurgical ablation was developed and used by Sealy, Cox and Holman., Currently catheter ablation technique are used for this purpose., ECTOPIC ATRIAL TACHYCARDIA, Ectopic foci of activation in either right or left atrium can provoke paroxysmal of atrial, tachycardia., Treated by catheter ablation., , END OF TACHYCARDIA….