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Transient atrioventricular conduction block with cryoablation following normal cryomapping.
Peter S Fischbach1, Elizabeth V Saarel, MacDonald Dick
1University of Michigan, Ann Arbor, 48109, USA. petersf@umich.edu
Heart Rhythm
|April 27, 2005
Summary
Cryoablation for supraventricular tachycardia can cause temporary heart block, even if cryomapping shows no issues. Careful monitoring during cryoablation is essential to manage potential adverse effects on AV conduction.
Area of Science:
- Electrophysiology
- Cardiovascular Ablation Techniques
Background:
- Transcatheter cryoablation is a novel treatment for supraventricular tachycardia.
- It offers advantages over radiofrequency ablation, including reduced risks and improved lesion control.
Observation:
- Cryomapping is used to assess electrophysiologic effects before permanent lesion creation.
- Occasionally, adverse effects occur during cryoablation despite seemingly safe cryomapping.
Findings:
- In five patients, cryoablation caused transient complete heart block after uneventful cryomapping.
- This indicates that cryolesion size may exceed the area identified during cryomapping.
Implications:
- Vigilance is crucial during cryoablation to monitor for atrioventricular nodal conduction abnormalities.
- Even when cryomapping indicates a safe site, potential risks necessitate careful observation.