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- W3146045327 abstract "C T T hich n role i the r trial t key f r arc a ial p ved a req e of t cuit h p well d ded b c p H a ntroduction he term macroreentrant atrial tachycardia (MRAT) i echanistic way of categorizing an arrhythmia indep ently of its electrocardiogram (ECG) characteristics. 1 Alhough the ECG aspect of this arrhythmia is most frequ hat of a flutter (no return to baseline in at least one l an be that of an atrial tachycardia (return to baseline eads) especially in the case of a diseased heart. By d ion, the requirements for an atrial macroreentry to occu large circuit, an area of slow conduction, and a zo nidirectional block. In the atria, these requirements pontaneously determined by anatomical structures such ulmonary venous ostia or tricuspid or mitral rings o reas of electrical disturbances induced by cardiac surg y previous ablation, or spontaneously. Identification of a reentrant arrhythmia is based on rophysiological characteristics. In the presence of RAT, transient entrainment is always possible, and trial activation covering the entire cycle almost always e recorded. After the last entrained beat, a postpa nterval within 20 ms of the tachycardia cycle length ifies the pacing site as a site inside the circuit. Contr icroreentry, macroreentry is confirmed if exact return les are recorded from at least two atrial sites separate t least 2 cm. Before ablation of MRAT, identification rotected isthmus inside the circuit can be crucial sinc s usually the target site. A protected isthmus is iden f pacing slightly faster than the tachycardia rate d red at that site produces concealed entrainment, tha ndocardial atrial activation sequence and surface aves identical to those observed during spontane achycardia (Figure 1) . In addition, the interval betw he spike of stimulation and the surface P wave d acing should be identical to the interval between the lectrogram and the surface P wave site during tachyca ll of these electrophysiologic characteristics are requi o identify a protected isthmus." @default.
- W3146045327 created "2021-04-13" @default.
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- W3146045327 date "2008-01-01" @default.
- W3146045327 modified "2023-09-27" @default.
- W3146045327 title "acroreentrant atrial tachycardia: Pathophysiological concepts" @default.
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