Noninvasive study of ventricular preexcitation using multichannel magnetocardiography.
نویسندگان
چکیده
In clinical practice, noninvasive classification of ventricular preexcitation (VPX) is usually done with ECG algorithms, which provide only a qualitative localization of accessory pathways. Since 1984, single or multichannel magnetocardiography (MMCG) has been used for three-dimensional localization of VPX sites, but a systematic study comparing the results of ECG and MMCG methods was lacking. This study evaluated the reliability of MMCG in an unshielded electrophysiological catheterization laboratory, and compared VPX classification as achieved with the five most recent ECG algorithms with that obtained by MMCG mapping and imaging techniques. A nine-channel direct current superconducting quantum interference device (DC-SQUID) MMCG system (sensitivity is 20 fT/Hz0.5) was used for sequential MMCG from 36 points on the anterior chest wall, within an area 20 x 20 cm. Twenty-eight patients with Wolff-Parkinson-White syndrome were examined at least twice, on the same day or after several months to test the reproducibility of the measurements. In eight patients, the reproducibility of MMCG was also evaluated using different MCG instrumentation during maximal VPX and/or atrioventricular reentrant tachycardia induced by transesophageal atrial pacing via a nonmagnetic catheter. The results of VPX localization with ECG algorithms and MMCG were compared. Equivalent current dipole, effective magnetic dipole, and distributed currents imaging models were used for the inverse solution. MMCG classification of VPX was found to be more accurate than ECG methods, and also provided additional information for the identification of paraseptal pathways. Furthermore, in patients with complex activation patterns during the delta wave, distributed currents imaging revealed two different activation patterns, suggesting the existence of multiple accessory pathways.
منابع مشابه
Fetal Atrial Flutter: Electrophysiology and Associations With Rhythms Involving an Accessory Pathway
BACKGROUND Atrial flutter (AFl) accounts for up to one third of all fetal tachyarrhythmias and can result in premature delivery, hydrops, and fetal death in 10% of cases; however, the electrophysiology of AFl in utero is virtually unstudied. METHODS AND RESULTS In this observational study, we reviewed 19 fetal magnetocardiography studies from 16 fetuses: 15 fetuses (21-38 weeks' gestation) re...
متن کاملComparison of magnetocardiography and electrocardiography: a study of automatic measurement of dispersion of ventricular repolarization.
AIMS There is some dispute over the clinical significance of dispersion of ventricular repolarization measurements from the electrocardiogram. Recent studies have indicated that multichannel magnetocardiograms (MCGs), which non-invasively measure cardiac magnetic field strength from many sites above the body surface, may provide independent information from ECGs about ventricular repolarization...
متن کاملNoninvasive Localization of Cardiac Arrhythmia Sources from Multichannel Ecg Measurements
Results of noninvasive localization of arrhythmogenic tissue in the heart from multichannel ecg measurements are presented. Location of initial preexcitation was estimated by inverse computations using multiple dipole (MD) or jumping dipole (JD) model of equivalent heart generator. First, the influence of error factors frequently met in practice was analyzed on simulated ecg data. Mean localiza...
متن کاملMultichannel Magnetocardiography and Body Surface Potential Mapping in Exercise-induced Myocardial Ischemia
متن کامل
Detection of left ventricular hypertrophy by multichannel magnetocardiography
Left ventricular hypertrophy (LVH) is a powerful independent risk factor for cardiac morbidity and mortality [1]. Although LVH itself may be symptomless, its detection is likely to contribute to the treatment of the patient. Thus, the detection of LVH is a clinical priority. The most widely used methods for detecting LVH are 12-lead electrocardiography (ECG) and echocardiography. The ECG criter...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Pacing and clinical electrophysiology : PACE
دوره 26 1 Pt 2 شماره
صفحات -
تاریخ انتشار 2003