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Transvenous cryoablation of the bundle of His
P C Gillette1, M M Swindle, R P Thompson
1Medical University of South Carolina, Department of Comparative Medicine, Charleston 29425.
Insights
Transvenous catheter cryoablation effectively created atrioventricular block in swine, offering a promising alternative to current cardiac arrhythmia treatments. This minimally invasive approach warrants further investigation for clinical application.
Area of Science:
- Cardiology
- Interventional Cardiology
- Medical Device Technology
Background:
- Cardiac dysrhythmias contribute significantly to patient morbidity and mortality.
- Existing pharmacological treatments for arrhythmias are often ineffective and carry serious side effects.
- Current direct treatments like catheter ablation have notable drawbacks.
Purpose of the Study:
- To investigate the efficacy of transvenous catheter cryoablation of the bundle of His as a novel treatment for cardiac arrhythmias.
- To evaluate the safety and feasibility of this transcatheter therapy in a preclinical model.
Main Methods:
- Transvenous catheter cryoablation was performed on the bundle of His in five miniature swine (40-60 lbs).
- Animals were observed for 1 hour post-procedure to assess the duration of induced atrioventricular block.
- Morphological and histological examinations were conducted on the atrioventricular node and proximal bundle of His.
Main Results:
- Complete atrioventricular block was achieved in four out of five swine during cryothermia.
- In one swine, 2:1 atrioventricular block persisted within the atrioventricular node for the 1-hour observation period.
- Histological analysis showed no damage to capillaries or myofibrils in the targeted region.
Conclusions:
- Transvenous catheter cryoablation of the bundle of His is a viable method for inducing atrioventricular block in a preclinical setting.
- This transcatheter approach demonstrates potential as a safer and effective alternative for managing cardiac arrhythmias.
- Further research is warranted to explore the clinical utility of this innovative therapy.
Abstract:
Cardiac dysrhythmias are a prominent cause of morbidity and mortality. Pharmacological treatment is ineffective in a large number of patients and is associated with many serious side effects. Thus, direct treatment of cardiac arrhythmias has been used with increasing frequency. Each form of direct treatment, such as surgical ablation, DC catheter ablation, radiofrequency catheter ablation, laser catheter ablation suffer serious drawbacks. Thus, we investigated the utility of transvenous catheter cryoablation of the bundle of His in five miniature swine, 40-60 lbs. in weight. Complete atrioventricular block was produced in each animal during cryothermia and persisted for 1 hour of observation in four out of five swine. In the fifth animal, 2:1 atrioventricular block within the atrioventricular node persisted for 1 hour of observation. Morphological and histologic examination revealed no dysfunction of capillaries and myofibriles in the atrioventricular node and proximal bundle of His. This potential mode of transcatheter therapy deserves further investigation.