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The echo-transponder electrode catheter: a new method for mapping the left ventricle
J J Langberg1, J O Franklin, J S Landzberg
1Department of Medicine, University of California, San Francisco.
Journal of the American College of Cardiology
|July 1, 1988
Summary
An echo-transponder system precisely locates catheter tips in the left ventricle, improving accuracy for ventricular tachycardia mapping compared to traditional fluoroscopy.
Area of Science:
- Cardiovascular Imaging
- Electrophysiology
- Medical Device Technology
Background:
- Accurate catheter positioning in the left ventricle is crucial for effective ventricular tachycardia mapping.
- Current methods like biplane fluoroscopy have limitations in precision for endocardial landmark identification.
Purpose of the Study:
- To compare the accuracy of a novel echo-transponder system against biplane fluoroscopy for left ventricular endocardial catheter mapping.
- To evaluate the potential of the echo-transponder system to enhance electrophysiologic mapping precision.
Main Methods:
- A modified 6F electrode catheter with an integrated piezoelectric crystal and transponder was used.
- The system generated ultrasound signals, creating a visible artifact on 2D echocardiography corresponding to the catheter tip.
- Catheter positions were compared against radiofrequency-created lesions in canine left ventricles, using both echo-transponder and biplane fluoroscopy.
Main Results:
- The echo-transponder system localized the catheter tip with an average accuracy of 8.7 mm from the lesion center.
- Biplane fluoroscopy showed an average accuracy of 14 mm from the lesion center (p = 0.023).
- The echo-transponder system demonstrated significantly higher precision in catheter tip localization.
Conclusions:
- The echo-transponder system offers superior precision for left ventricular catheter localization compared to biplane fluoroscopy.
- This enhanced accuracy holds promise for improving the precision of ventricular tachycardia mapping procedures.