Influence of SWCA on small coronary vessels. (A) In the RF lesions, more than 50% of the vessels showed thrombotic occlusion, whereas almost all small vessels were patent in the SW lesions (left lower panel, arrow). Scale bars: 200 μm. Quantitative data are shown in the right panel. (B) Regional myocardial blood flow was higher in the SW lesions compared with the RFCA lesions. (C and D) The extent of myocardial angiogensis in the border region (C) and the central region (D), as evaluated by the number of microvessels, was significantly increased in the SWCA lesions than in the RFCA lesions at the subacute phase (Days 4 and 7). Scale bar: 200 μm.