Mini-, Micro-, and Conventional Electrodes

This study sought to assess the relative effect of catheter, tissue, and catheter-tissue parameters, on ability determine amount viable myocardium in vivo. Although multiple variables impact bipolar voltages (BVs), electrode size, interelectrode spacing, directional dependency are particular interest with development catheters incorporating mini microelectrodes. Nine swine early reperfusion myocardial infarctions were mapped using QDot catheter then remapped a Pentaray catheter. All points matched within 5 mm. The sacrificed, mapping data projected onto heart. Transmural biopsies corresponding obtained, allowing comparison electrograms recorded by mini, micro-, conventional electrodes histology. BV 2,322 was 1.9 ± 1.3 mV. largest 3 microelectrode BVs (BVµMax) average 4.8 3.1 difference between (BV?Max) smallest (BV?Min) at given location 53.7 18.1%. relationships both BV?Max BV?Min positively related but significant spread data, which more pronounced for latter. poor fit. On histology, increasing increased voltage, slope coefficient fit best BV?Max. Using we could demonstrate that is superior identify compared BVC simultaneously record BV?s different orientations, same beat, controllable contact selecting local may partially compensate wave front direction.