Related Experiment Videos
An improved technique for his bundle recording and ablation in dogs
1Department of Internal Medicine, University of Alberta School of Medicine, Edmonton, Canada.
The Journal of Surgical Research
|October 1, 1990
Summary
Researchers developed a novel method to reliably induce complete atrioventricular heart block in dogs. This technique allows for precise cardiac pacing studies by preventing accelerated junctional rhythms, crucial for physiological investigations.
Area of Science:
- Cardiovascular Physiology
- Animal Models
Background:
- Accurate control of heart rate is essential for physiological studies of cardiac function.
- Investigating heart rate effects below intrinsic rates necessitates preventing junctional rhythms after sinus node elimination.
Purpose of the Study:
- To present a new, simple, and reliable method for inducing complete atrioventricular heart block in open-chest dogs.
- To enable precise control of cardiac rhythms for physiological research.
Main Methods:
- A novel catheter constructed from two bonded 22-gauge needles.
- One needle contains a bipolar recording electrode; the other facilitates formalin injection.
- The method allows for His bundle electrical activity recording.
Main Results:
- Successful induction of complete atrioventricular heart block in all five dogs studied.
- Demonstrated a stable ventricular escape rhythm post-induction.
- The catheter proved durable, reusable, and sterilizable.
Conclusions:
- The presented technique provides a reliable method for creating complete atrioventricular heart block in canine models.
- This facilitates physiological investigations requiring controlled heart rates and elimination of sinus node influence.