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Figure 3 Representative examples of QT intervals at different cycle lengths from one susceptible (A) and one resistant (B) dog 30 days after myocardial infarction (open circles) and after development of ischemic left ventricular dysfunction (open triangles). The normal QT and RR interval relationship is demonstrated from 10 normal dogs in the closed circles. Nonlinear regression analysis was used to produce the best-fit line to illustrate the normal QT to RR interval relationship. EF = ejection fraction; MI = myocardial infarction.