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Acute open-chest complete heart block by transeptal electrocoagulation.
1Department of Physiology and Surgery, University of Michigan Medical School, Ann Arbor 48109.
The American Journal of Physiology
|May 1, 1990
Summary
Researchers developed a new electrocautery pinch-clamp device to reliably create complete heart block (CHB) in dogs for acute studies. This method offers a simpler and more effective approach for cardiac research.
Area of Science:
- Cardiovascular Physiology
- Surgical Techniques
- Animal Models
Background:
- Previous methods for inducing complete heart block (CHB) in dogs were found to be unreliable or overly complex.
- There was a need for a more efficient and reproducible technique for acute open-chest studies.
Purpose of the Study:
- To describe a novel method for producing complete heart block (CHB) in open-chest dogs.
- To present a new electrocautery pinch-clamp device designed for this purpose.
Main Methods:
- A custom electrocautery pinch-clamp device was used to locate and ablate the atrioventricular node and His bundle in the atrial septum of anesthetized dogs.
- The device was inserted via atrial appendages during a left thoracotomy, and the correct site was identified by palpation and induced rhythm disturbances.
- Electrocautery was applied for 10-15 seconds, with monitoring via Lead II ECG to confirm sustained CHB.
Main Results:
- The novel method successfully produced stable complete heart block (CHB) in 12 out of 15 attempts (80% success rate).
- The induced CHB lasted for at least 3-4 hours.
- Post-procedure examination revealed no significant septal defects or tricuspid valve damage.
Conclusions:
- The developed electrocautery pinch-clamp method is a reliable and advantageous technique for inducing CHB in acute canine studies.
- This method simplifies the process and improves reproducibility compared to existing techniques.
- The findings support the utility of this device for cardiac electrophysiology research.