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Figure 1 Electrocardiographic Changes Induced by Transmural Ischemia

(A) Single electrocardiographic complex from lead V₂ obtained under baseline conditions, before the start of the angioplasty of the left anterior descending coronary artery (LAD). (B) Single electrocardiographic complex from the same lead shown in A is displayed 25 s after balloon inflation in the proximal LAD. The QT interval is seen to prolong by 44 ms. (C) The 2 complexes seen in A and B are superimposed to better illustrate ischemia-induced changes showing prolongation of QT interval.