Optimization of Cryoablation Catheter-Tissue Contact Using the Contact Index.

Pacing Clin ElectrophysiolMar 27, 2026 (epub)
Case ReportCardiologyOpen access

Kentaro Hayashi, Takeshi Kitamura, Chihiro Izumi et al.

✦ AI-curated · Sources linked

Case in brief

The report describes a modified setup that allowed the contact index (CI) to be visualized during septal cryoablation with a Freezor Xtra catheter. In vitro testing showed that CI rose as the catheter moved closer to tissue. In two clinical cases, successful lesions were achieved at CI values of approximately 20%-25%. CI increased even when electrogram changes were minimal, and its values correlated with tissue proximity. The authors concluded that CI-guided cryoablation was feasible and may improve assessment of catheter-tissue contact during septal ablation.

What made this case unusual

CI could rise with catheter-tissue proximity despite minimal electrogram changes, offering a quantitative contact signal when electrograms provided little indication of contact.

Diagnostic / clinical pearl

During septal cryoablation, CI may provide information about catheter-tissue proximity that is not apparent from electrogram changes alone.

Source

PubMed · PMID 41891668Free full text on PubMed Central

Published in Pacing Clin Electrophysiol. This summary was written by xxcode from the publication's abstract and metadata. It is not peer reviewed and is not a substitute for the original article. For clinical decisions, review the original publication.

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