Figure 3From: Dobutamine stress MR in Tetralogy of Fallot with significant pulmonary regurgitation, safety, feasibility and haemodynamic effectsSub-groups defined by change in right ventricular end systolic volume (RV-ESV). Group 1-patients with no change or an increase in RV-ESV with dobutamine 20 mcg. Group 2-patients with a decrease in RV-ESV with dobutamine 20 mcg.Back to article page