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Figure 7 Trends of ST-segment level (upper panel) and HF-QRS (lower panel) during a 5-min LCX occlusion. The leads I and III are shown. The balloon was inflated at time 0. There was ST elevation (>0.1 mV) in lead III but no significant ST deviation in lead I. In both these leads there was a significant decrease in HF-QRS. HF-QRS = high-frequency QRS components, LCX = left circumflex coronary artery.
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