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Figure 1 Impact of PTCA and intracoronary stenting following thrombolytic administration on coronary blood flow. The percent distribution of the original 90-min TIMI flow grades among those patients who ultimately underwent stent placement is shown below the bar diagram. To the right of each bar is the percent of patients who went on to develop each of the TIMI flow grades following PTCA and stenting. For example, 34% of those patients who were stented had TIMI flow grade 0/1 at 90 min. Two percent of the patients who began with TIMI flow grade 0/1 remained occluded following the conventional PTCA, 28% went on to develop TIMI flow grade 2, and 70% went on to develop TIMI flow grade 3 after conventional PTCA. Following stent placement, no patients had TIMI flow grade 0/1, 12% had TIMI flow grade 2, and 88% had TIMI flow grade 3. The sample size of patients with PTCA data is reduced because the post-PTCA flow was not always filmed prior to stent placement.