Source:http://linkedlifedata.com/resource/pubmed/id/10461298
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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
8
|
| pubmed:dateCreated |
1999-10-5
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| pubmed:abstractText |
This study was performed to: (1) evaluate the accuracy of noninvasive magnetocardiographic (MCG) 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 MCG localization at the peak stimulus and the MCG localization, during the ventricular evoked response about 3 ms later, was 4 +/- 1 mm calculated from signal-averaged data. The 95% confidence interval of beat-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 multipurpose catheter by multichannel MCG suggests that the method could be developed toward a useful clinical tool during electrophysiological studies.
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| pubmed:language |
eng
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| pubmed:journal | |
| pubmed:citationSubset |
IM
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| pubmed:status |
MEDLINE
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| pubmed:month |
Aug
|
| pubmed:issn |
0147-8389
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| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
22
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
1210-20
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| pubmed:dateRevised |
2006-11-15
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| pubmed:meshHeading |
pubmed-meshheading:10461298-Adult,
pubmed-meshheading:10461298-Body Surface Potential Mapping,
pubmed-meshheading:10461298-Coronary Disease,
pubmed-meshheading:10461298-Electric Stimulation,
pubmed-meshheading:10461298-Electrocardiography,
pubmed-meshheading:10461298-Electrodes,
pubmed-meshheading:10461298-Feasibility Studies,
pubmed-meshheading:10461298-Female,
pubmed-meshheading:10461298-Fluoroscopy,
pubmed-meshheading:10461298-Heart Catheterization,
pubmed-meshheading:10461298-Heart Rate,
pubmed-meshheading:10461298-Humans,
pubmed-meshheading:10461298-Image Processing, Computer-Assisted,
pubmed-meshheading:10461298-Magnetic Resonance Imaging,
pubmed-meshheading:10461298-Magnetics,
pubmed-meshheading:10461298-Male,
pubmed-meshheading:10461298-Middle Aged,
pubmed-meshheading:10461298-Reproducibility of Results
|
| pubmed:year |
1999
|
| pubmed:articleTitle |
Nonfluoroscopic localization of an amagnetic stimulation catheter by multichannel magnetocardiography.
|
| pubmed:affiliation |
Clinical Physiology-Biomagnetism Research Center, Catholic University, Rome, Italy.
|
| pubmed:publicationType |
Journal Article,
Comparative Study,
Research Support, Non-U.S. Gov't
|