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Figure 4 Differences before and after epinephrine at the baseline condition and with oral propranolol in the mean cQT_e (A), mean cQT_p (B), mean cT_p-e (C), maximum cQT_e (D), minimum cQT_e (E) and cQT_e-D (F) in 11 LQT1 patients (open circles) and 11 LQT2 patients (solid circles). The differences in the mean cQT_e, mean cT_p-e, maximum cQT_e and cQT_e-D values with epinephrine at the baseline condition were significantly greater in the LQT1 group than in the LQT2 group. In both groups, propranolol completely suppressed the influence of epinephrine, and the differences in all variables with epinephrine plus oral propranolol were not significantly different between the two groups.