FIGURE 1. (A) Changes in NE concentrations at coronary sinus (CS) and brachial artery (artery) with respect to VO₂ during graded exercise in representative case with positive NE overflow. (B) Changes of difference in NE concentration between coronary sinus and arterial blood (NE_CS-A) with respect to VO₂. (C) Changes in NE_CS-A with respect to arterial NE concentration (NE_A). (D and E) Initial (D) and delayed (E) ¹²³I-MIBG planar images in anterior view. Cardiac ¹²³I-MIBG activity was reduced only mildly. H/M = ¹²³I-MIBG uptake ratio.

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