The researchers say that their discovery can be applied to medical purposes, such as magnetoencephalographic or magnetocardiographic
techniques that are used to measure the magnetic fields created by the brain or the heart, which in order to function properly need to shield out all other existing magnetic fields.
Objective: More than two decades of research work have shown that magnetocardiographic mapping (MCG) is reliable for non-invasive three-dimensional electroanatomical imaging (3D-EAI) of arrhythmogenic substrates.
Methods: Magnetocardiographic mapping is performed with a 36-channel unshielded mapping system, based on DC-SQUID sensors coupled to second-order axial gradiometers (pick-up coil 19 mm and 55-70 mm baselines; sensitivity of 20 fT/[square root of Hz] in above 1 Hz), as part of the electrophysiologic investigation protocol, tailored to the diagnostic need of each arrhythmic patient.
The proposal to use magnetocardiographic mapping to guide aimed electrophysiology and ablation of cardiac arrhythmias is more than 20 years old (21).
Magnetocardiographic signals were digitally recorded in the DC-100 Hz bandwidth with a Windows-based acquisition system (24 bits A/D conversion, with automatic electronic noise rejection, at 1 kHz sampling rate) (Fig.
Magnetocardiographic mapping can be acquired simulta neously with 12-lead electrocardiogram (ECG), esophageal and/or intracardiac electrograms, and monophasic action potentials, recorded with the CardioLab System (General Electric).
Magnetocardiographic signals are analyzed with the system software (27) and with the UNIX-based MCG software developed atthe Helsinki University of Technology (Neuromag, Finland) (46).
Is there any place for magnetocardiographic imaging in the era of robotic ablation of cardiac arrhythmias?
Biomagnetically localizable multipurpose catheter and method for magnetocardiographic guided intracardiac mapping, biopsy and ablation of cardiac arrhythmias.
Comparison between electrocardiographic and magnetocardiographic inverse solutions using the boundary element method.
Non-fluoroscopic localization of an magnetic catheter in a realistic torso phantom by magnetocardiographic and body surface potential mapping.