Figure 4. For the propofol-sufentanil or sufentanil-midazolam groups, the temporal distribution of percentage of patients with Holter electrocardiograms interpretable for ST segment deviation who had ST segment depression (arrow down ST) or ST segment elevation (arrow up ST). Also presented is the temporal distribution after release of aortic occlusion of the percentage of all patients with right bundle branch block, ventricular pacing, or cardiac conduction changes making the Holter electrocardiogram uninterpretable for ST segment deviation. Before cardiopulmonary bypass, only ST segment depression was common and is presented.