Does Unidirectional Block Exist after a Radiofrequency Line Creation? Insights from Ultra-High-Density Mapping (The UNIBLOCK Study)
BACKGROUND: Whether unidirectional conduction block (UB) can be observed after creation of a radiofrequency (RF) line is still debated. Previous studies reported a prevalence of 9 to 33% of UB, but the assessment was performed using a point-by-point recording across the line. Ultra-high-density (UHD) system may bring some new insights on the exact prevalence of UB.
PURPOSE: A prospective study was conducted to assess the prevalence of UB and bidirectional block (BB) using UHD system after RF line creation.
METHODS: Patients referred for atrial RF ablation procedure were included in this multicenter prospective study. UHD maps were performed by pacing both sides of the created line.
RESULTS: A total of 80 maps were created in 40 patients (67 ± 12 years, 70% male) by pacing (mean cycle length 600 ± 57 ms) from both sides of the cavotricuspid isthmus line. After a 47 ± 17 min waiting time after the last RF application, UHD maps (mean number of 4842 ± 5010 electrograms, acquired during 6 ± 5 min) showed that BB was unambiguously confirmed on all of them. UB was not observed in any map. After a mean follow-up of 12 ± 4 months, 6 (14%) patients experienced an arrhythmia recurrence.
CONCLUSION: After creation of an RF line, no case of UB was observed using UHD mapping, suggesting that the presence of a conduction block along a RF line is always associated with a block in the opposite direction.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2021 |
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| Erschienen: |
2021 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:10 |
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| Enthalten in: |
Journal of clinical medicine - 10(2021), 11 vom: 06. Juni |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Bun, Sok-Sithikun [VerfasserIn] |
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| Links: |
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| Themen: |
Journal Article |
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| Anmerkungen: |
Date Revised 05.07.2021 published: Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.3390/jcm10112512 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM32750823X |
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| 245 | 1 | 0 | |a Does Unidirectional Block Exist after a Radiofrequency Line Creation? Insights from Ultra-High-Density Mapping (The UNIBLOCK Study) |
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| 500 | |a Date Revised 05.07.2021 | ||
| 500 | |a published: Electronic | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a BACKGROUND: Whether unidirectional conduction block (UB) can be observed after creation of a radiofrequency (RF) line is still debated. Previous studies reported a prevalence of 9 to 33% of UB, but the assessment was performed using a point-by-point recording across the line. Ultra-high-density (UHD) system may bring some new insights on the exact prevalence of UB | ||
| 520 | |a PURPOSE: A prospective study was conducted to assess the prevalence of UB and bidirectional block (BB) using UHD system after RF line creation | ||
| 520 | |a METHODS: Patients referred for atrial RF ablation procedure were included in this multicenter prospective study. UHD maps were performed by pacing both sides of the created line | ||
| 520 | |a RESULTS: A total of 80 maps were created in 40 patients (67 ± 12 years, 70% male) by pacing (mean cycle length 600 ± 57 ms) from both sides of the cavotricuspid isthmus line. After a 47 ± 17 min waiting time after the last RF application, UHD maps (mean number of 4842 ± 5010 electrograms, acquired during 6 ± 5 min) showed that BB was unambiguously confirmed on all of them. UB was not observed in any map. After a mean follow-up of 12 ± 4 months, 6 (14%) patients experienced an arrhythmia recurrence | ||
| 520 | |a CONCLUSION: After creation of an RF line, no case of UB was observed using UHD mapping, suggesting that the presence of a conduction block along a RF line is always associated with a block in the opposite direction | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a radiofrequency line | |
| 650 | 4 | |a ultra-high-density mapping | |
| 650 | 4 | |a unidirectional block | |
| 700 | 1 | |a Da Costa, Antoine |e verfasserin |4 aut | |
| 700 | 1 | |a Guichard, Jean-Baptiste |e verfasserin |4 aut | |
| 700 | 1 | |a Khoueiry, Ziad |e verfasserin |4 aut | |
| 700 | 1 | |a Squara, Fabien |e verfasserin |4 aut | |
| 700 | 1 | |a Scarlatti, Didier |e verfasserin |4 aut | |
| 700 | 1 | |a Taghji, Philippe |e verfasserin |4 aut | |
| 700 | 1 | |a Moceri, Pamela |e verfasserin |4 aut | |
| 700 | 1 | |a Ferrari, Emile |e verfasserin |4 aut | |
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