Defibrillation Electrode Position Study Using Current Density Imaging
Jorgenson D, Wang D, Ma A, DeMonte T, Joy M
Philips Medical Systems
The MRI technique current density imaging was used to measure current density vectors in a pig. Current was applied through defibrillation electrodes placed in both the apex-anterior (AA) and apex-posterior (AP) positions. The animal was in a state of ventricular fibrillation (VF) during the first acquisition and subsequent acquisitions were made post-mortem (PM). Sufficient data was acquired in a single experimental procedure to compare VF-AA, VF-AP, PM-AA and PM-AP. Comparative analysis was performed for current flow direction using vector plots and streamlines. Comparative analysis of current density magnitude was performed using cumulative distribution plots.