A noninvasive imaging modality for cardiac arrhythmias

Area of Science:

• Cardiovascular imaging
• Electrophysiology
• Medical device technology

Background:

• Heart disease research has advanced, but clinical translation requires better diagnostic tools.
• Current methods fail to precisely locate cardiac arrhythmias like ventricular tachycardia (VT).
• A noninvasive method for imaging cardiac arrhythmias is needed for diagnosis and intervention.

Purpose of the Study:

• To extend the application of noninvasive electrocardiographic imaging (ECGI) to visualize reentrant arrhythmias.
• To demonstrate ECGI's capability in reconstructing epicardial electrophysiological information during VT.

Main Methods:

• Developed a noninvasive ECGI modality using body surface potentials to reconstruct epicardial information.
• Recorded epicardial potentials in dogs during VT using an electrode sock.
• Simulated torso data with noise and errors to test reconstruction accuracy.

Main Results:

• ECGI accurately reconstructed epicardial isochrones, electrograms, and potentials.
• Successfully identified key components of the VT reentrant pathway, including pathways, exit sites, and conduction blocks.
• Detailed characterization of reentrant circuit morphology was achieved.

Conclusions:

• ECGI enables noninvasive imaging of epicardial activation during VT.
• The technology can identify and localize critical components of arrhythmogenic pathways.
• ECGI offers potential for effective antiarrhythmic intervention targets.