Key result
Magnetocardiography localizes accessory pathways within ~1.8 cm of invasive catheter mapping.
Why the study?
The clinical relevance of noninvasive magnetocardiographic localization of accessory pathways in WPW syndrome was not established.
Does noninvasive magnetocardiography accurately localize accessory pathways compared to invasive catheter mapping in patients with WPW syndrome?
Observational (n=9)
Does noninvasive magnetocardiography accurately localize accessory pathways compared to invasive catheter mapping in patients with WPW syndrome?
Magnetocardiography is a promising noninvasive method for localizing accessory pathways in WPW syndrome, with an average spatial difference of 1.8 cm compared to invasive mapping.
Answers are grounded in this paper and cite their sources.
Preliminary data support magnetocardiography for accessory pathway localization; hypothesis-generating and should not yet change practice.
It was our purpose to assess the clinical relevance of noninvasive magnetocardiographic localization of accessory pathways. Nine patients with Wolff-Parkinson-White (WPW) syndrome were studied. For all of them the site of the accessory pathway was known from invasive catheter mapping. A 37-SQUID (superconducting quantum interference device) sensor multichannel system (KRENIKON) was used, allowing synchronous registration with all channels. The site of the electrophysiological activity at the beginning of the delta wave was determined. Magnetic resonance images of the heart were obtained to correlate the biomagnetically localized activity with the anatomy. Magnetocardiographic localization of the bypass tract corresponded with catheter mapping with a spatial difference of 0-5 cm, 1.8 cm on the average, compared to the results obtained by catheter mapping. Thus, magnetocardiography is a promising new method for noninvasive localization of accessory pathways in WPW patients. This may streamline further invasive procedures.
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WEISMÜLLER et al. (1991) conducted an observational in Wolff-Parkinson-White (WPW) syndrome (n=9). Noninvasive magnetocardiographic localization vs. Invasive catheter mapping was evaluated on Spatial difference between magnetocardiographic localization and catheter mapping. Noninvasive magnetocardiographic localization of accessory pathways corresponded with invasive catheter mapping with an average spatial difference of 1.8 cm (range 0-5 cm).
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