Evaluation of magnetic navigation in an in vitro model of uterine artery embolization.

Purpose: To compare steering of a novel magnetic guide wire with a standard 0.014-inch guide wire within a vascular phantom.

Materials And Methods: The magnetic guiding system (MGS) was composed of two permanent magnets on each long side of the fluoroscopy table generating a 0.

Vascular guide wire navigation with a magnetic guidance system: experimental results in a phantom.

Purpose: To investigate the efficacy of a second-generation prototype magnetic guidance system in complex vessel phantoms versus conventional navigation in simulated interventional radiology procedures and to analyze procedure and fluoroscopy times.

Materials And Methods: The magnetic guidance system consists of two focused-field permanent magnets on each side of the body that create a 0.1-T navigation field and is integrated with a modified C-arm single-planar digital angiography system.

Spatial features in body surface potential maps of patients with ventricular tachyarrhythmias with or without coronary artery disease.

Body surface potential maps (BSPM) from patients with coronary artery disease or no structural heart disease were analyzed with respect to their spatial features and QT/QTc dispersion in order to determine whether BSPM allows identification of patients with ventricular fibrillation. QRST integral maps and QT/QTc dispersion were acquired from simultaneous recordings of 62 ECG leads during sinus rhythm in patients with idiopathic ventricular fibrillation (n=13), ventricular fibrillation and coronary artery disease (n=22), coronary artery disease without ventricular fibrillation (n=21) and healthy controls (n=18). The Karhunen-Loeve transformation was applied to reduce the dimensionality of the data matrix of the QRST map to eight coefficients.

[Analysis of QRST integral and QT dispersion by body surface potential mapping in patients with malignant ventricular arrhythmias].

In a retrospective analysis in 74 patients with coronary artery disease or no obvious heart disease, the value of "body surface potential mapping" for the identification of repolarization abnormalities was investigated compared to the standard 12-lead ECG. In patients with idiopathic ventricular fibrillation the number of extrema in the QRST integral map was significantly higher than in the control group (3.15+/-0.

Localisation of myocardial ischaemia from the magnetocardiogram using current density reconstruction method: computer simulation study.

A computer simulation study is performed to investigate the method of current density reconstruction to localise myocardial ischaemia. A computer model of the entire human heart is used to simulate the excitation and repolarisation process in eight topographically different cases of myocardial ischaemia. The associated magnetocardiogram is calculated at 37 positions of the KRENIKON biomagnetic measurement equipment.