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Figure 1 Left anterior oblique cranial Biosense NOGA unipolar (left) and linear local shortening map (right) shows reduced anterolateral wall linear local shortening in red (regional function) with preserved unipolar voltage indicating viable but underperfused myocardium. Twenty-five laser channels were created using the Biosense Ho:YAG laser system (brown dots) in the "ischemic" zone (red) of the anterolateral wall.