We thank Junming Yan, consultant of Johnson&#38;Johnoson, who is responsible for research grants.This work was funded by the Jilin Provincial Department of Science and Technology (20220402076GH).

This research procedure closely adhered to the rules of human research ethics committee of China-Japan Union Hospital of Jilin University. Patients who underwent radiofrequency ablation of atrial fibrillation were searched on the Carto system (3D mapping system). Then, the PACS system was used to determine whether the patient underwent left atrial CT examination before surgery to ascertain that each selected patient had left atrial CT images for comparison. Soundstar is the ICE catheter used in this study, and a Cartosou...

ICE-Based 3D Remodeling for the Left Atrium and Pulmonary Vein

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	<li>Xu, Y., Sharma, D., Li, G., Liu, Y. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Atrial+remodeling:+new+pathophysiological+mechanism+of+atrial+fibrillation.">Atrial remodeling: new pathophysiological mechanism of atrial fibrillation.</a> Medical Hypotheses. 80 (1), 53-56 (2013).</li><li>George, J. 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Cardiovascular Imaging. 17 (1), 1-8 (2016).</li><li>Haissaguerre, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Spontaneous+initiation+of+atrial+fibrillation+by+ectopic+beats+originating+in+the+pulmonary+veins.">Spontaneous initiation of atrial fibrillation by ectopic beats originating in the pulmonary veins.</a> New England Journal of Medicine. 339 (10), 659-666 (1998).</li><li>Kaseno, K., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+impact+of+the+CartoSound&#174;+image+directly+acquired+from+the+left+atrium+for+integration+in+atrial+fibrillation+ablation.">The impact of the CartoSound&#174; image directly acquired from the left atrium for integration in atrial fibrillation ablation.</a> Journal of Interventional Cardiac Electrophysiology. 53, 301-308 (2018).</li><li>Enriquez, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Use+of+intracardiac+echocardiography+in+interventional+cardiology:+working+with+the+anatomy+rather+than+fighting+it.">Use of intracardiac echocardiography in interventional cardiology: working with the anatomy rather than fighting it.</a> Circulation. 137 (21), 2278-2294 (2018).</li></ol>

Intracardiac echocardiography (ICE) is a noncontact three-dimensional reconstruction tool. It determines the appropriate ablation plane and reduces the incidence of pulmonary vein stenosis. Moreover, ICE improves the effectiveness of catheter ablation by assessing the distal position of the ablation catheter and its relative association with the anatomical structures. These structures include the left atrium and pulmonary vein and the diameter and morphology of the pulmonary vein.
ICE-guided a...

Atrial fibrillation (AF) is commonly associated with atrial remodeling, including mechanical remodeling, electrophysiologic remodeling, and structural remodeling1. Structural remodeling will dramatically affect the anatomy of the atrium. Hence, assessing the left atrial anatomy in AF patients is essential for AF ablation procedures and any procedure targeting the left atrium. For the FAM 3D modeling, the 3D modeling of the heart is reconstructed based on the spatial position change of its position corresponding to the fixed magnetic field by continuously displacing the magnetic catheter in the heart. In contrast, ICE 3D modeling integrates the two-dimensional image in the cardiac cavity with the 3D electroanatomic mapping system by positioning the sensor at the head end of the ICE phase array catheter. Thus, the ultrasonic sector represents 3D modeling to demonstrate the anatomical relationship and real-time catheter position.
Based on our clinical experience, intracardiac echocardiography (ICE) can identify the atrial wall boundary and further establish the 3D remodel. However, most ICE usage during AF ablation or 3D remodeling just provides a brief profile of the atria or pulmonary veins. Originally, ICE was applied to guide the interventional closure of atrial septal defect and patent foramen ovale2. ICE can clarify the location and shape of the atrial septal and has been used for various interventional procedures requiring atrial septal puncture3. These include radiofrequency catheter ablation of atrial fibrillation, mitral valve interventional therapy, etc. ICE can precisely identify pulmonary vein boundaries and atrial walls to establish a more detailed 3D model3. It is unclear whether this method could provide operators with a more precise atrial anatomy assessment, especially for the pulmonary vein antrum and transseptal sites. In this study, we compared the left atrium CT image and 3D remodel established using traditional methods and precise ICE procedures to determine additional information.

<table border="1" fo:keep-together.within-page="1" fo:keep-with-next.within-page="always">
	<tbody>
		<tr>
			<td>CARTO V6</td>
			<td>Johnson&#38;Johnson</td>
			<td>6.0.80.45</td>
			<td></td>
		</tr>
		<tr>
			<td>CARTO V7</td>
			<td>Johnson&#38;Johnson</td>
			<td>7.1.80.33</td>
			<td></td>
		</tr>
		<tr>
			<td>PACS system</td>
			<td>Philips(China) Investment Co.,Ltd</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr>
			<td>Soundstar</td>
			<td>Johnson&#38;Johnson</td>
			<td>N/A</td>
			<td></td>
		</tr>
	</tbody>
</table>

three-dimensional modeling of the left atrium and pulmonary veins with a precise intracardiac echocardiography approach

Intracardiac echocardiography (ICE) is a novel tool for estimating cardiac anatomy during pulmonary vein isolation procedures, particularly the left atrium (LA) anatomy and pulmonary vein structures. ICE is widely used to establish a three-dimensional (3D) left atrial structural model during ablation procedures. However, it is unclear whether using ICE in a precise 3D modeling method can provide a more accurate left atrial 3D model and the transseptal approach. This study proposes a protocol to model the left atrium and pulmonary veins with ICE and fast anatomical mapping (FAM) catheter remodeling. It evaluates the accuracy of the models produced using the two methods through observer scoring. We included 50 patients who underwent ICE-based 3D remodeling and 45 who underwent FAM 3D remodeling based on pulmonary vein isolation procedures. The pulmonary vein antrum remodeling is estimated by comparing the antrum area acquired by remodeling and left atrial computed tomography angiography (CTA). The observer scores for the modeling in the ICE and FAM groups were 3.40 &#177; 0.81 and 3.02 &#177; 0.72 (P &#60; 0.05), respectively. The pulmonary vein antrum area obtained using the ICE- and FAM-based methods showed a correlation with the area acquired by left atrium CT. However, the 95% confidence interval bias was narrower in ICE-acquired models than in FAM-acquired models (-238 cm2 to 323 cm2 Vs. -363 cm2 to 386 cm2, respectively) using Bland-Altman analysis. Therefore, precise ICE possesses high accuracy in estimating the left atrial structure, becoming a promising approach for future cardiac structure estimation.

Author Spotlight: Advancements in Intracardiac Echocardiography for Atrial Anatomy Assessment 

Three-Dimensional Modeling of the Left Atrium and Pulmonary Veins with a Precise Intracardiac Echocardiography Approach

Our research tries to evaluate whether intracardiac echocardiography-based 3D construction could enhance the accuracy of pulmonary atrium and assessments in arterial anatomy. Intracardiac echocardiography is capable of identifying the arterial wall boundary and creating a 3D model of pulmonary winds. Recently this has been increased, the focus on using S2 often detailed images for accurately determining arterial anatomy.One of the current experimental challenges is accurately imitating the left arterial structure. However, promising results have been obtained use as best arterial imaging and safety deconstruction, which has high accuracy and hold potential for future cardiac structure imaging.

From January 2021 to June 2022, we selected 114 patients who underwent radiofrequency ablation of atrial fibrillation at our hospital. Patients were excluded based on the following criteria: no 3D volume reconstruction image of left atrial CT (n = 11), no transseptal puncture ICE image (n = 4), and incomplete reconstruction of the left atrium and pulmonary vein images (n = 4). Finally, 50 patients with ICE 3D modeling and 45 with FAM 3D modeling as control group was included in this study.
Two...

Watch this Scientific Journal Video about Advancements in Intracardiac Echocardiography for Atrial Anatomy Assessment at JoVE.com

Accurate intracardiac echocardiography (ICE) shows significant accuracy in estimating the left atrial structure, a prospective and promising cardiac structure estimation method. Here we propose a protocol for three-dimensional modeling of the left atrium and pulmonary veins with ICE and fast anatomical mapping (FAM) catheter remodeling.

Intracardiac echocardiography (ICE) is a novel tool for estimating cardiac anatomy during pulmonary vein isolation procedures, particularly the left ...

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