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Nonflouroscopic Localization of an Amagnetic Stimulation Cathether by Multichannel Magnetocardiography.
- Source :
- Pacing & Clinical Electrophysiology; Aug1999, Vol. 22 Issue 8, p1210-1220, 11p, 3 Diagrams, 3 Charts
- Publication Year :
- 1999
-
Abstract
- This study was performed to: (1) evaluate the accuracy of noninvasive magneto-cardiographic (MCC) localization of an amagnetic stimulation catheter; (2) validate the feasibility of this multipurpose catheter; and (3) study the characteristics of cardiac evoked fields. A stimulation catheter specially designed to produce no magnetic disturbances was inserted into the heart of five patients after routine electrophysiological studies. The catheter position was documented on biplane cine x-ray images. MCG signals were then recorded in a magnetically shielded room during cardiac pacing. Noninvasive localization of the catheter's tip and stimulated depolarization was computed from measured MCG data using a moving equivalent current-dipole source in patient-specific boundary element torso models. In all five patients, the MCG localizations were anatomically in good agreement with the catheter positions defined from the x-ray images. The mean distance between the position of the tip of the catheter defined from x-ray fluoroscopy and the MCG localization was 11 ± 4 mm. The mean three-dimensional difference between the MCC localization at the peak stimulus and the MCC localization, during the ventricular evoked response about 3 ms later, was 4 ± 1 mm calculated from signal-averaged data. The 95% confidence interval of heat-to-beat localization of the tip of the stimulation catheter from ten consecutive beats in the patients was 4 ± 2 mm. The propagation velocity of the equivalent current dipole between 5 and 10 ms after the peak stimulus was 0.9 ± 0.2 m/s. The results show that the use of the amagnetic catheter is technically feasible and reliable in clinical studies. The accurate three-dimensional localization of this multi-purpose catheter by multichannel MCG suggests that the method could be developed toward a useful clinical tool during electrophysiological studies. [ABSTRACT FROM AUTHOR]
- Subjects :
- CATHETERS
CARDIAC pacing
FLUOROSCOPY
CARDIOGRAPHY
ELECTRONICS in cardiology
PATIENTS
Subjects
Details
- Language :
- English
- ISSN :
- 01478389
- Volume :
- 22
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- Pacing & Clinical Electrophysiology
- Publication Type :
- Academic Journal
- Accession number :
- 17124878
- Full Text :
- https://doi.org/10.1111/j.1540-8159.1999.tb00602.x