Does unidirectional block exist after a radiofrequency line creation? Data from Ultra-High-Resolution apping (the UNIBLOCK Study) - 06/01/20
Résumé |
Background |
Whether unidirectional conduction block (UB) can be observed after creation of a radiofrequency (RF) line is still a subject of debate. Previous study reported a prevalence of 9% of UB, but the assessment was performed using a point-by-point recording across the line, which may have artificially increased this UB percentage.
Purpose |
To prospectively assess bidirectional block using ultra-high-resolution (UHR) system after RF line creation.
Methods |
Prospective patients admitted for an RF ablation procedure were included in this study. UHR maps were performed by pacing on both sides of the line created.
Results |
A total of 18 maps were created in 8 patients (5 men, mean age 71.5±10) by pacing (mean cycle length 600±80ms) from both sides of the line after a mean waiting time of 60±18min: 2 left atrial roof and 7 cavotricuspid isthmus lines; mean number of 4863±3982 electrograms (381±651 beats) acquired during 10±9min; mean right or left atrial volume 81±82mL. The RF lines were all unambiguously blocked bidirectionally. After a mean follow-up of 12±4 months, no patient experienced any arrhythmia recurrence (Fig. 1).
Conclusion |
UHR mapping confirmed that the presence of a conduction block along a RF line is always associated with a block in the opposite direction.
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Vol 12 - N° 1
P. 119 - janvier 2020 Retour au numéroBienvenue sur EM-consulte, la référence des professionnels de santé.