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Figure 1 Bar graphs representing the differences in cardiac spillover rates for norepinephrine (NE SR), dihydroxyphenylalanine (DOPA SR), dihydroxyphenylglycol (DHPG SR) and tritium-labeled dihydroxyphenylglycol (3H DHPG SR), for patients not treated with amiodarone (A–) and those treated with amiodarone (A+). *p < 0.05, **p < 0.01, ***p < 0.001.