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Vol. 36. Núm. 4.
Páginas 313-316 (abril 2017)
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Vol. 36. Núm. 4.
Páginas 313-316 (abril 2017)
Image in Cardiology
Open Access
Ablation of stable complex fractionated atrial electrogram defined by dynamic overlaid mapping in persistent atrial fibrillation
Mapas de sobreposição dinâmica na fibrilhação auricular persistente: ablação de um eletrograma complexo fracionado estável
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Pedro Adragão
Autor para correspondência
padragao@gmail.com

Corresponding author.
, Pedro Carmo, Diogo Cavaco, João Carmo, Francisco Costa, Francisco Morgado
Department of Cardiology, Santa Cruz Hospital, CHLO, Carnaxide, Portugal
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We describe the case of a 64-year-old woman with persistent atrial fibrillation (more than one year's duration) referred for ablation. Three-dimensional electroanatomical mapping of the left atrium was performed using the Ensite NavX™ system (St. Jude Medical, Minneapolis, MN) and a Constellation™ 64-pole basket diagnostic catheter (Boston Scientific, Natick, MA). A stable complex fragmented atrial electrogram (CFAE) was identified in 5-min time-frame windows using novel proprietary software (Figure 1). A localized radiofrequency application over the CFAE near the left pulmonary vein ostia modified electrical activity in the posterior wall of the left atrium, increasing cycle length until interruption (Figures 2–4). This case highlights the importance of finding areas that are critical in maintaining electrical fibrillatory activity. A precise ablation target was identified (stable CFAE).

Figure 1.

Posteroanterior view of the left atrium showing a stable complex fragmented atrial electrogram (CFAE) defined by dynamic overlaid mapping. Anatomy defined by the Ensite NavX™ system; electrograms recorded by basket catheter (Constellation, Boston Scientific); ablation performed by ablation catheter (yellow) located over the area of a stable CFAE (white arrow). CFAE: complex fractionated atrial electrogram; CS: coronary sinus; LIPV: left inferior pulmonary vein; LSPV: left superior pulmonary vein; RIPV: right inferior pulmonary vein; RSPV: right superior pulmonary vein.

(0.17MB).
Figure 2.

Above, anatomical mapping of the left atrium with the Constellation catheter and the ablation catheter. Below, coronary sinus electrograms and electrograms from the splines of the diagnostic catheter. The posterior wall is represented from splines C to F. Immediately after initiation of radiofrequency application, an increase in cycle length in the posterior wall is noted (scale 50 mm/s). LIPV: left inferior pulmonary vein; LSPV: left superior pulmonary vein; RF: radiofrequency; RIPV: right inferior pulmonary vein; RSPV: right superior pulmonary vein.

(0.76MB).
Figure 3.

During the first radiofrequency application, a marked slowing in the posterior wall is seen. LIPV: left inferior pulmonary vein; LSPV: left superior pulmonary vein; RIPV: right inferior pulmonary vein; RSPV: right superior pulmonary vein.

(0.67MB).
Figure 4.

During the second radiofrequency application to eliminate the stable CFAE (enlarged lesion), interruption of the electrical activity of the posterior wall is seen (scale 25 mm/s to confirm continued electrical activity suppression). LIPV: left inferior pulmonary vein; LSPV: left superior pulmonary vein; RIPV: right inferior pulmonary vein; RSPV: right superior pulmonary vein.

(0.77MB).
Ethical disclosuresProtection of human and animal subjects

The authors declare that the procedures followed were in accordance with the regulations of the relevant clinical research ethics committee and with those of the Code of Ethics of the World Medical Association (Declaration of Helsinki).

Confidentiality of data

The authors declare that they have followed the protocols of their work center on the publication of patient data.

Right to privacy and informed consent

The authors have obtained the written informed consent of the patients or subjects mentioned in the article. The corresponding author is in possession of this document.

Conflicts of interest

The authors have no conflicts of interest to declare.

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