Figure 2

The force-frequency curve with DIP stress echo in the Donor heart. Upper panel: An increased heart rate is accompanied by smaller end-systolic volumes (normal up sloping FFR). The pressure/volume relation was 9.6 mmHg/ml/m² at baseline, increasing to 14 mmHg/ml/m² at peak stress, FFR slope = 28 mmHg/ml/m²/bpm demonstrating absence of latent myocardial dysfunction. Middle and lower panels. Systemic blood pressure and LVEF % at baseline and peak stress. A stress induced increase in LVEF simultaneously to stress induced systolic and diastolic pressure decrease is confounding for the contractile reserve evaluation.