High Resolution ECG Mapping System for Noninvasive Cardiac Diagnostics

Multichannel system for surface ECG mapping is introduced and its use for cardiac diagnostics and noninvasive assessment of ischemic heart regions is presented. The system can use up to 128 active electrodes; surface potentials are measured relatively to a relocatable common mode sensing electrode that together with active neutralization of the patient facilitates optimal signal quality. Battery powered microprocessor controlled data acquisition unit is connected to the Ethernet port of a personal computer through an optical extension cable. Windows based measurement and data analysis software enables e.g. estimation of the location and size of a myocardial infarction using departure integral mapping or noninvasive identification of local ischemia using measured QRST integral maps and model of the patient’s torso volume conductor.