Echo-transponder localization was more precise than biplane fluoroscopy for left ventricular mapping, with a distance to lesion of 8.7 +/- 5.1 mm versus 14 +/- 7.8 mm (p=0.023).
Does an echo-transponder system improve the accuracy of left ventricular catheter mapping compared to biplane fluoroscopy in anesthetized dogs?
An echo-transponder system provides more precise catheter localization in the left ventricle compared to biplane fluoroscopy in a canine model, potentially improving electrophysiologic mapping.
Absolute Event Rate: 8.7% vs 14%
p-value: p=0.023
The ability to locate catheter position in the left ventricle with respect to endocardial landmarks might enhance the accuracy of ventricular tachycardia mapping. An echo-transponder system (Telectronics, Inc.) was compared with biplane fluoroscopy for left ventricular endocardial mapping. A 6F electrode catheter was modified with the addition of a piezoelectric crystal 5 mm from the tip. This crystal was connected to a transponder that received and transmitted ultrasound, resulting in a discrete artifact on the two-dimensional echocardiographic image corresponding to the position of the catheter tip. Catheters were introduced percutaneously into the left ventricle of nine anesthetized dogs. Two-dimensional echo-transponder and biplane fluoroscopic images were recorded on videotape with the catheter at multiple endocardial sites. Catheter location was marked by delivering radiofrequency current to the distal electrode, creating a small endocardial lesion. Catheter location by echo-transponder and by fluoroscopy were compared with lesion location without knowledge of other data. Location by echo-transponder was 8.7 +/- 5.1 mm from the center of the radiofrequency lesion versus 14 + 7.8 mm by fluoroscopy (n = 15, p = 0.023). Echo-transponder localization is more precise than is biplane fluoroscopy and may enhance the accuracy of left ventricular electrophysiologic mapping.
Langberg et al. (Fri,) conducted a other in Left ventricular mapping (n=9). Echo-transponder electrode catheter vs. Biplane fluoroscopy was evaluated on Distance from the center of the radiofrequency lesion (mm) (p=0.023). Echo-transponder localization was more precise than biplane fluoroscopy for left ventricular mapping, with a distance to lesion of 8.7 +/- 5.1 mm versus 14 +/- 7.8 mm (p=0.023).