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Impedance mapping with constant contact force on 3D electroanatomic map to characterize tissues at pulmonary veno-atrial junction

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Abstract

Purpose

Generator impedance (Im) mapping with constant contact force (CF) by tip catheter at PV isolation (PVI) was assessed for a proposal of tissue characterization at PV-LA junction (PV-LAJ).

Methods

In this observational, prospective, single-center study, Im mapping at constant CF = 10 g (± 2 g) was performed before PVI at PV-LAJ. PV in-vein, PV ostium (PVos), and antrum (PVan) contours were manually traced based on the 3D electroanatomic map (3DEAM) integrating intracardiac echocardiography and computerized tomography. PVan contour-methods based on Im mapping was defined on 3DEAM as the atrial-like Im contour closest to PVos, and its distance from anatomical PVan contour > 5 mm was assumed as the non-concordance marker between contour and methods.

Results

Sixty-two patients (62 ± 9 years; 43 males) were enrolled, and 244 PV-LAJ were assessed. From in-vein PV to LA and, less prominently, from PVos to PVan and LA, Im showed a unidirectional decrease with highly variable individual-specific distribution and values. PVan non-concordance was found in 59/665 segments (8.8%), 18% of PV-LAJs, and 53% of pts; it prevailed in superior PV-LAJ and measured on average 7.2 ± 1.1 mm. Im decrease patterns and non-concordance were not associated with any clinical or anatomical feature, including PV dimensions and shape.

Conclusions

Im mapping of LA-PVJ at constant CF added to 3DEAM may consistently track the tissue transition from PV to LA. PVan identified by Im was often located more toward LA than the 3D anatomical PVan, particularly in LSPV, suggesting the potential advantage of avoiding ablation of venous-like tissue. Im mapping can deserve further investigation for target characterization at LA-PVJ.

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Acknowledgments

Authors thank Fabio Ansaloni, MD, radiologist at Ravenna Hospital, for his careful assessment of CT images; Matteo Fioravanti and Francesco Masci, BME, technical specialists at Biosense-Webster Company, for their assistance at EP procedures and for the image preparation; and Gaia Nicoletti, BME at the University of Bologna, for her contribution to data analysis.

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Authors and Affiliations

Authors

Contributions

All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Corrado Tomasi, Alessandro Dal Monte, Cristiana Corsi Selina Argnani, and Stefano Severi. The first draft of the manuscript was written by Corrado Tomasi, Cristiana Corsi, and Stefano Severi, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Corrado Tomasi.

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Conflict of interest

C. T. has been a scientific consultant for Boston Scientific Italia and Biotronik Italia. Other authors declare that they have no conflict of interest.

Ethics approval

This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Ethics Committee of Romagna–CEROM (no.1870; approval date 17/05/2017) and by Institution “Azienda Unità Sanitaria Locale della Romagna,” to which most authors belong (no.1567, date 12/06/2017).

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All participants have given written informed consent to the study before the enrolment.

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Tomasi, C., Dal Monte, A., Argnani, M.S. et al. Impedance mapping with constant contact force on 3D electroanatomic map to characterize tissues at pulmonary veno-atrial junction. J Interv Card Electrophysiol 61, 469–477 (2021). https://doi.org/10.1007/s10840-020-00845-4

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