Preprocedural computed tomography angiography-based conduction system simulation for optimized patient-specific...

Area of Science:

• Cardiology
• Medical Imaging
• Interventional Cardiology

Background:

• Conduction disturbances necessitating permanent pacemaker implantation (PPI) are a significant limitation for transcatheter aortic valve implantation (TAVI).
• Optimizing TAVI device placement is crucial to mitigate procedural complications and improve patient outcomes.

Purpose of the Study:

• To evaluate a novel computed tomography angiography (CTA)-based conduction system simulation for patient-specific TAVI implantation depth.
• To determine if this simulation technology can reduce the incidence of postprocedural permanent pacemaker implantation (PPI).

Main Methods:

• Retrospective application of CARA Metis conduction system simulation using CTA data from patients who underwent TAVI.
• Classification of implantation strategies into a patient-specific conduction system protocol versus fixed depths (1-4 mm) below the aortic annulus.
• Primary outcome assessment was postprocedural PPI, with device depth measured from postprocedural CTA.

Main Results:

• Of 228 patients, 51 (22.4%) required PPI. Mean distances from the aortic annulus to key conduction landmarks (His bundle, left bundle branch origin) were measured.
• Implantation below the native conduction pathway was associated with significantly higher odds of PPI (ORs ranging from 1.24 to 1.27 per mm).
• Implantation guided by the simulation to be above the conduction pathway (n=25) resulted in significantly fewer PPI (0.0%) compared to standard depth strategies (10.0%-25.0%; P < .0001).

Conclusions:

• CTA-based conduction system simulation offers a promising strategy for patient-specific TAVI deployment.
• This approach, guided by the conduction axis, may minimize the requirement for permanent pacemaker implantation.
• Further prospective trials are necessary to validate these hypothesis-generating findings.