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Non-fluoroscopic Catheter Tracking for Fluoroscopy Reduction in Interventional Electrophysiology

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Initial impedance decrease as an indicator of good catheter contact: insights from radiofrequency ablation with force

Tobias Reichlin¹, Sven Knecht², Christopher Lane³

¹Cardiovascular Division, Brigham and Women's Hospital, Boston, Massachusetts; University Hospital, Basel, Switzerland.

|November 2, 2013

Summary

This summary is machine-generated.

Achieving greater contact force during radiofrequency ablation for atrial fibrillation correlates with larger initial impedance decreases. This impedance change can serve as a valuable indicator for improving ablation lesion quality.

Keywords:

AF Atrial fibrillation ablation CF Contact force sensing catheter EGM IQR Impedance decrease PV PVI RF atrial fibrillation contact force electrogram interquartile range pulmonary vein pulmonary vein isolation radiofrequency

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Published on: January 31, 2019

Area of Science:

Electrophysiology
Cardiovascular Interventions
Medical Device Technology

Background:

Optimal catheter-tissue contact force (CF) is crucial for effective radiofrequency (RF) ablation lesions but challenging to measure clinically.
Tissue heating during RF ablation causes a detectable decrease in catheter tip impedance.

Purpose of the Study:

To investigate the relationship between achieved catheter contact force and the initial impedance decrease during atrial fibrillation (AF) ablation procedures.

Main Methods:

Correlated achieved CF with initial impedance decreases in patients undergoing AF ablation using two novel CF-sensing RF catheters (SmartTouch, TactiCath).
Compared impedance decreases from CF-sensing catheters to those from a standard RF catheter (ThermoCool).

Main Results:

Higher CF levels consistently resulted in larger initial impedance decreases for both CF-sensing catheters.
CF-sensing catheters demonstrated significantly greater initial impedance decreases compared to the standard catheter, indicating improved contact assessment.

Conclusions:

The initial impedance decrease during RF ablation is a reliable indicator of catheter contact force.
Monitoring impedance changes can potentially enhance the formation of durable ablation lesions in AF treatment.